1 10 Fix java data export functions (#450)

* HDFFV-10865 - merge from dev, HDFArray perf fix.

* Remove duplicate setting

* Whitespace changes after clang format

* Undo version 11 clang format changes

* Merge CMake changes from develop

* test testing script merge from develop

* Update supported platforms

* PR#3 merge from develop

* Merge gcc 10 diagnostics option from develop

* Merge #318 OSX changes from develop

* Merge small changes from develop

* Minor non-space formatting changes

* #386 copyright corrections for java folder

* Merges from develop

#358 patches from vtk
#361 fix header guard spelling

* Merge updates

#358 patches from vtk
#361 fix header guard spelling

* format fix

* Fix missing underscore and make H5public.h closer to dev

* Merges from develop

#340 clang -Wformat-security warnings
#360 Fixed uninitialized warnings
header guard underscore cleanup
JNI cleanup

* format alignment

* Add missing test ref file

* Merge #380 from develop

* Finish java merges from develop

* Fix java issues with tests and javadoc

* Correct use of attribute access plist

* Remove debug code

* Remove unused variable

* Change file access to read only for java tests

* Split clang format operations.

* More javadoc comments

* Remove pre-split setting

* format source

51 files changed, 350 insertions, 350 deletions

diff --git a/java/examples/datasets/H5Ex_D_Alloc.java b/java/examples/datasets/H5Ex_D_Alloc.java
index d0e8f81..4e10c23 100644
--- a/java/examples/datasets/H5Ex_D_Alloc.java
+++ b/java/examples/datasets/H5Ex_D_Alloc.java
@@ -64,11 +64,11 @@ public class H5Ex_D_Alloc {
     }
 
     private static void allocation() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id1 = -1;
-        long dataset_id2 = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id1 = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id2 = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
         int space_status = 0;
diff --git a/java/examples/datasets/H5Ex_D_Checksum.java b/java/examples/datasets/H5Ex_D_Checksum.java
index e0a1638..781dd68 100644
--- a/java/examples/datasets/H5Ex_D_Checksum.java
+++ b/java/examples/datasets/H5Ex_D_Checksum.java
@@ -92,10 +92,10 @@ public class H5Ex_D_Checksum {
     }
 
     private static void writeChecksum() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -192,9 +192,9 @@ public class H5Ex_D_Checksum {
     }
 
     private static void readChecksum() {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file.
diff --git a/java/examples/datasets/H5Ex_D_Chunk.java b/java/examples/datasets/H5Ex_D_Chunk.java
index 74e7530..2ddf293 100644
--- a/java/examples/datasets/H5Ex_D_Chunk.java
+++ b/java/examples/datasets/H5Ex_D_Chunk.java
@@ -65,10 +65,10 @@ public class H5Ex_D_Chunk {
     }
 
     private static void writeChunk() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -200,10 +200,10 @@ public class H5Ex_D_Chunk {
     }
 
     private static void readChunk() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file.
diff --git a/java/examples/datasets/H5Ex_D_Compact.java b/java/examples/datasets/H5Ex_D_Compact.java
index 7751db9..0abf8da 100644
--- a/java/examples/datasets/H5Ex_D_Compact.java
+++ b/java/examples/datasets/H5Ex_D_Compact.java
@@ -59,10 +59,10 @@ public class H5Ex_D_Compact {
     }
 
     private static void writeCompact() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
@@ -162,10 +162,10 @@ public class H5Ex_D_Compact {
     }
 
     private static void readCompact() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open file and dataset using the default properties.
diff --git a/java/examples/datasets/H5Ex_D_External.java b/java/examples/datasets/H5Ex_D_External.java
index 1797ec8..9c3787f 100644
--- a/java/examples/datasets/H5Ex_D_External.java
+++ b/java/examples/datasets/H5Ex_D_External.java
@@ -33,10 +33,10 @@ public class H5Ex_D_External {
     private static final int NAME_BUF_SIZE = 32;
 
     private static void writeExternal() {
-        long file_id = -1;
-        long dcpl_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
@@ -137,9 +137,9 @@ public class H5Ex_D_External {
     }
 
     private static void readExternal() {
-        long file_id = -1;
-        long dcpl_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
         String[] Xname = new String[1];
 
diff --git a/java/examples/datasets/H5Ex_D_FillValue.java b/java/examples/datasets/H5Ex_D_FillValue.java
index 4577249..3526993 100644
--- a/java/examples/datasets/H5Ex_D_FillValue.java
+++ b/java/examples/datasets/H5Ex_D_FillValue.java
@@ -39,10 +39,10 @@ public class H5Ex_D_FillValue {
     private static final int FILLVAL = 99;
 
     private static void fillValue() {
-        long file_id = -1;
-        long dcpl_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] extdims = { EDIM_X, EDIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
diff --git a/java/examples/datasets/H5Ex_D_Gzip.java b/java/examples/datasets/H5Ex_D_Gzip.java
index 2529b47..404ff05 100644
--- a/java/examples/datasets/H5Ex_D_Gzip.java
+++ b/java/examples/datasets/H5Ex_D_Gzip.java
@@ -94,10 +94,10 @@ public class H5Ex_D_Gzip {
     }
 
     private static void writeGzip() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -195,9 +195,9 @@ public class H5Ex_D_Gzip {
     }
 
     private static void readGzip() {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file.
diff --git a/java/examples/datasets/H5Ex_D_Hyperslab.java b/java/examples/datasets/H5Ex_D_Hyperslab.java
index e77493f..fa3473f 100644
--- a/java/examples/datasets/H5Ex_D_Hyperslab.java
+++ b/java/examples/datasets/H5Ex_D_Hyperslab.java
@@ -33,9 +33,9 @@ public class H5Ex_D_Hyperslab {
     private static final int RANK = 2;
 
     private static void writeHyperslab() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
@@ -141,10 +141,10 @@ public class H5Ex_D_Hyperslab {
     }
 
     private static void readHyperslab() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file.
diff --git a/java/examples/datasets/H5Ex_D_Nbit.java b/java/examples/datasets/H5Ex_D_Nbit.java
index fbb504b..35d23a9 100644
--- a/java/examples/datasets/H5Ex_D_Nbit.java
+++ b/java/examples/datasets/H5Ex_D_Nbit.java
@@ -95,11 +95,11 @@ public class H5Ex_D_Nbit {
     }
 
     private static void writeData() throws Exception {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dtype_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -156,9 +156,9 @@ public class H5Ex_D_Nbit {
     }
 
     private static void readData() throws Exception {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file.
diff --git a/java/examples/datasets/H5Ex_D_ReadWrite.java b/java/examples/datasets/H5Ex_D_ReadWrite.java
index da9d0b4..db930d3 100644
--- a/java/examples/datasets/H5Ex_D_ReadWrite.java
+++ b/java/examples/datasets/H5Ex_D_ReadWrite.java
@@ -31,9 +31,9 @@ public class H5Ex_D_ReadWrite {
     private static final int RANK = 2;
 
     private static void WriteDataset() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
@@ -108,8 +108,8 @@ public class H5Ex_D_ReadWrite {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open file using the default properties.
diff --git a/java/examples/datasets/H5Ex_D_Shuffle.java b/java/examples/datasets/H5Ex_D_Shuffle.java
index 85192bb..1dd7c6a 100644
--- a/java/examples/datasets/H5Ex_D_Shuffle.java
+++ b/java/examples/datasets/H5Ex_D_Shuffle.java
@@ -121,10 +121,10 @@ public class H5Ex_D_Shuffle {
     }
 
     private static void writeShuffle() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -228,9 +228,9 @@ public class H5Ex_D_Shuffle {
     }
 
     private static void readShuffle() {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file.
diff --git a/java/examples/datasets/H5Ex_D_Sofloat.java b/java/examples/datasets/H5Ex_D_Sofloat.java
index c1365f7..a42aba4 100644
--- a/java/examples/datasets/H5Ex_D_Sofloat.java
+++ b/java/examples/datasets/H5Ex_D_Sofloat.java
@@ -95,10 +95,10 @@ public class H5Ex_D_Sofloat {
     }
 
     private static void writeData() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         double[][] dset_data = new double[DIM_X][DIM_Y];
@@ -212,9 +212,9 @@ public class H5Ex_D_Sofloat {
     }
 
     private static void readData() {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         double[][] dset_data = new double[DIM_X][DIM_Y];
 
         // Open file using the default properties.
diff --git a/java/examples/datasets/H5Ex_D_Soint.java b/java/examples/datasets/H5Ex_D_Soint.java
index 2192cb9..dd7664f 100644
--- a/java/examples/datasets/H5Ex_D_Soint.java
+++ b/java/examples/datasets/H5Ex_D_Soint.java
@@ -95,10 +95,10 @@ public class H5Ex_D_Soint {
     }
 
     private static void writeData() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -194,9 +194,9 @@ public class H5Ex_D_Soint {
     }
 
     private static void readData() {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open file using the default properties.
diff --git a/java/examples/datasets/H5Ex_D_Szip.java b/java/examples/datasets/H5Ex_D_Szip.java
index ad04692..3fdc712 100644
--- a/java/examples/datasets/H5Ex_D_Szip.java
+++ b/java/examples/datasets/H5Ex_D_Szip.java
@@ -94,10 +94,10 @@ public class H5Ex_D_Szip {
     }
 
     private static void writeSzip() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -195,9 +195,9 @@ public class H5Ex_D_Szip {
     }
 
     private static void readSzip() {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file.
diff --git a/java/examples/datasets/H5Ex_D_Transform.java b/java/examples/datasets/H5Ex_D_Transform.java
index 0c63afd..069e80b 100644
--- a/java/examples/datasets/H5Ex_D_Transform.java
+++ b/java/examples/datasets/H5Ex_D_Transform.java
@@ -35,10 +35,10 @@ public class H5Ex_D_Transform {
     private static String RTRANSFORM = "x-1";
 
     private static void writeData() {
-        long file_id = -1;
-        long filespace_id = -1;
-        long dataset_id = -1;
-        long dxpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dxpl_id = HDF5Constants.H5I_INVALID_HID;
 
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];
@@ -143,9 +143,9 @@ public class H5Ex_D_Transform {
 
     private static void readData() {
 
-        long file_id = -1;
-        long dataset_id = -1;
-        long dxpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dxpl_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset_data = new int[DIM_X][DIM_Y];
 
         // Open an existing file using the default properties.
diff --git a/java/examples/datasets/H5Ex_D_UnlimitedAdd.java b/java/examples/datasets/H5Ex_D_UnlimitedAdd.java
index 2e18b99..c82b2d6 100644
--- a/java/examples/datasets/H5Ex_D_UnlimitedAdd.java
+++ b/java/examples/datasets/H5Ex_D_UnlimitedAdd.java
@@ -38,10 +38,10 @@ public class H5Ex_D_UnlimitedAdd {
     private static final int NDIMS = 2;
 
     private static void writeUnlimited() {
-        long file_id = -1;
-        long dcpl_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         long[] maxdims = { HDF5Constants.H5S_UNLIMITED, HDF5Constants.H5S_UNLIMITED };
@@ -142,9 +142,9 @@ public class H5Ex_D_UnlimitedAdd {
     }
 
     private static void extendUnlimited() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] extdims = { EDIM_X, EDIM_Y };
         long[] start = { 0, 0 };
@@ -292,9 +292,9 @@ public class H5Ex_D_UnlimitedAdd {
     }
 
     private static void readUnlimited() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data;
 
diff --git a/java/examples/datasets/H5Ex_D_UnlimitedGzip.java b/java/examples/datasets/H5Ex_D_UnlimitedGzip.java
index b651621..675b1ba 100644
--- a/java/examples/datasets/H5Ex_D_UnlimitedGzip.java
+++ b/java/examples/datasets/H5Ex_D_UnlimitedGzip.java
@@ -98,10 +98,10 @@ public class H5Ex_D_UnlimitedGzip {
     }
 
     private static void writeUnlimited() {
-        long file_id = -1;
-        long dcpl_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         long[] maxdims = { HDF5Constants.H5S_UNLIMITED, HDF5Constants.H5S_UNLIMITED };
@@ -199,9 +199,9 @@ public class H5Ex_D_UnlimitedGzip {
     }
 
     private static void extendUnlimited() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] extdims = { EDIM_X, EDIM_Y };
         long[] start = { 0, 0 };
@@ -349,10 +349,10 @@ public class H5Ex_D_UnlimitedGzip {
     }
 
     private static void readUnlimited() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long dcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data;
 
diff --git a/java/examples/datasets/H5Ex_D_UnlimitedMod.java b/java/examples/datasets/H5Ex_D_UnlimitedMod.java
index 68aecc4..273ac3e 100644
--- a/java/examples/datasets/H5Ex_D_UnlimitedMod.java
+++ b/java/examples/datasets/H5Ex_D_UnlimitedMod.java
@@ -38,10 +38,10 @@ public class H5Ex_D_UnlimitedMod {
     private static final int NDIMS = 2;
 
     private static void writeUnlimited() {
-        long file_id = -1;
-        long dcpl_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dcpl_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] chunk_dims = { CHUNK_X, CHUNK_Y };
         long[] maxdims = { HDF5Constants.H5S_UNLIMITED, HDF5Constants.H5S_UNLIMITED };
@@ -142,9 +142,9 @@ public class H5Ex_D_UnlimitedMod {
     }
 
     private static void extendUnlimited() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         long[] extdims = { EDIM_X, EDIM_Y };
         int[][] dset_data;
@@ -278,9 +278,9 @@ public class H5Ex_D_UnlimitedMod {
     }
 
     private static void readUnlimited() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_Array.java b/java/examples/datatypes/H5Ex_T_Array.java
index 162ac89..3939b38 100644
--- a/java/examples/datatypes/H5Ex_T_Array.java
+++ b/java/examples/datatypes/H5Ex_T_Array.java
@@ -33,11 +33,11 @@ public class H5Ex_T_Array {
     private static final int NDIMS = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long filetype_id = -1;
-        long memtype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         long[] adims = { ADIM0, ADIM1 };
         int[][][] dset_data = new int[DIM0][ADIM0][ADIM1];
@@ -151,10 +151,10 @@ public class H5Ex_T_Array {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long filetype_id = -1;
-        long memtype_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         long[] adims = { ADIM0, ADIM1 };
         int[][][] dset_data;
diff --git a/java/examples/datatypes/H5Ex_T_ArrayAttribute.java b/java/examples/datatypes/H5Ex_T_ArrayAttribute.java
index 14ae9a4..c4c4bc4 100644
--- a/java/examples/datatypes/H5Ex_T_ArrayAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_ArrayAttribute.java
@@ -34,12 +34,12 @@ public class H5Ex_T_ArrayAttribute {
     private static final int NDIMS = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long filetype_id = -1;
-        long memtype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         long[] adims = { ADIM0, ADIM1 };
         int[][][] dset_data = new int[DIM0][ADIM0][ADIM1];
@@ -83,7 +83,7 @@ public class H5Ex_T_ArrayAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -174,11 +174,11 @@ public class H5Ex_T_ArrayAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long filetype_id = -1;
-        long memtype_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         long[] adims = { ADIM0, ADIM1 };
         int[][][] dset_data;
diff --git a/java/examples/datatypes/H5Ex_T_Bit.java b/java/examples/datatypes/H5Ex_T_Bit.java
index 95968d0..45d4e8a 100644
--- a/java/examples/datatypes/H5Ex_T_Bit.java
+++ b/java/examples/datatypes/H5Ex_T_Bit.java
@@ -31,9 +31,9 @@ public class H5Ex_T_Bit {
     private static final int RANK = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data = new int[DIM0][DIM1];
 
@@ -115,9 +115,9 @@ public class H5Ex_T_Bit {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_BitAttribute.java b/java/examples/datatypes/H5Ex_T_BitAttribute.java
index e093453..9b33ca5 100644
--- a/java/examples/datatypes/H5Ex_T_BitAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_BitAttribute.java
@@ -32,10 +32,10 @@ public class H5Ex_T_BitAttribute {
     private static final int RANK = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data = new int[DIM0][DIM1];
 
@@ -65,7 +65,7 @@ public class H5Ex_T_BitAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -138,10 +138,10 @@ public class H5Ex_T_BitAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_Commit.java b/java/examples/datatypes/H5Ex_T_Commit.java
index 204b632..62db5ea 100644
--- a/java/examples/datatypes/H5Ex_T_Commit.java
+++ b/java/examples/datatypes/H5Ex_T_Commit.java
@@ -100,9 +100,9 @@ public class H5Ex_T_Commit {
     }
 
     private static void CreateDataType() {
-        long file_id = -1;
-        long strtype_id = -1;
-        long filetype_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long strtype_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
         Sensor_Datatype datatypes = new Sensor_Datatype();
         // Create a new file using default properties.
         try {
@@ -182,9 +182,9 @@ public class H5Ex_T_Commit {
     }
 
     private static void ReadDataType() {
-        long file_id = -1;
-        long typeclass_id = -1;
-        long filetype_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long typeclass_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
 
         // Open an existing file.
         try {
diff --git a/java/examples/datatypes/H5Ex_T_Compound.java b/java/examples/datatypes/H5Ex_T_Compound.java
index f0fe715..8c83ebb 100644
--- a/java/examples/datatypes/H5Ex_T_Compound.java
+++ b/java/examples/datatypes/H5Ex_T_Compound.java
@@ -121,12 +121,12 @@ public class H5Ex_T_Compound {
     }
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long strtype_id = -1;
-        long memtype_id = -1;
-        long filetype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long strtype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         Sensor[] object_data = new Sensor[DIM0];
         byte[] dset_data = null;
@@ -285,11 +285,11 @@ public class H5Ex_T_Compound {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long strtype_id = -1;
-        long memtype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long strtype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         Sensor[] object_data2;
         byte[] dset_data;
diff --git a/java/examples/datatypes/H5Ex_T_CompoundAttribute.java b/java/examples/datatypes/H5Ex_T_CompoundAttribute.java
index d8fd4a1..58d2fb7 100644
--- a/java/examples/datatypes/H5Ex_T_CompoundAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_CompoundAttribute.java
@@ -124,13 +124,13 @@ public class H5Ex_T_CompoundAttribute {
     }
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long strtype_id = -1;
-        long memtype_id = -1;
-        long filetype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long strtype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         Sensor[] object_data = new Sensor[DIM0];
         byte[] dset_data = null;
@@ -204,7 +204,7 @@ public class H5Ex_T_CompoundAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -309,12 +309,12 @@ public class H5Ex_T_CompoundAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long strtype_id = -1;
-        long memtype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long strtype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         Sensor[] object_data2;
         byte[] dset_data;
diff --git a/java/examples/datatypes/H5Ex_T_Float.java b/java/examples/datatypes/H5Ex_T_Float.java
index f907b1f..e8da7f6 100644
--- a/java/examples/datatypes/H5Ex_T_Float.java
+++ b/java/examples/datatypes/H5Ex_T_Float.java
@@ -35,9 +35,9 @@ public class H5Ex_T_Float {
     private static final int RANK = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         double[][] dset_data = new double[DIM0][DIM1];
 
@@ -119,9 +119,9 @@ public class H5Ex_T_Float {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         double[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_FloatAttribute.java b/java/examples/datatypes/H5Ex_T_FloatAttribute.java
index 32b5a94..eb8e1f8 100644
--- a/java/examples/datatypes/H5Ex_T_FloatAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_FloatAttribute.java
@@ -36,10 +36,10 @@ public class H5Ex_T_FloatAttribute {
     private static final int RANK = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         double[][] dset_data = new double[DIM0][DIM1];
 
@@ -65,7 +65,7 @@ public class H5Ex_T_FloatAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -138,10 +138,10 @@ public class H5Ex_T_FloatAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         double[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_Integer.java b/java/examples/datatypes/H5Ex_T_Integer.java
index ddcc156..bb8e0cb 100644
--- a/java/examples/datatypes/H5Ex_T_Integer.java
+++ b/java/examples/datatypes/H5Ex_T_Integer.java
@@ -33,9 +33,9 @@ public class H5Ex_T_Integer {
     private static final int RANK = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data = new int[DIM0][DIM1];
 
@@ -116,9 +116,9 @@ public class H5Ex_T_Integer {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_IntegerAttribute.java b/java/examples/datatypes/H5Ex_T_IntegerAttribute.java
index 9024c9e..b0df5e4 100644
--- a/java/examples/datatypes/H5Ex_T_IntegerAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_IntegerAttribute.java
@@ -34,10 +34,10 @@ public class H5Ex_T_IntegerAttribute {
     private static final int RANK = 2;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data = new int[DIM0][DIM1];
 
@@ -63,7 +63,7 @@ public class H5Ex_T_IntegerAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -136,10 +136,10 @@ public class H5Ex_T_IntegerAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0, DIM1 };
         int[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_ObjectReference.java b/java/examples/datatypes/H5Ex_T_ObjectReference.java
index f561aa1..38536b8 100644
--- a/java/examples/datatypes/H5Ex_T_ObjectReference.java
+++ b/java/examples/datatypes/H5Ex_T_ObjectReference.java
@@ -64,11 +64,11 @@ public class H5Ex_T_ObjectReference {
     }
 
     private static void writeObjRef() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long filespace_id = -1;
-        long group_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long filespace_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[][] dset_data = new byte[DIM0][8];
 
@@ -89,9 +89,9 @@ public class H5Ex_T_ObjectReference {
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 if (dataset_id >= 0)
                     H5.H5Dclose(dataset_id);
-                dataset_id = -1;
+                dataset_id = HDF5Constants.H5I_INVALID_HID;
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -105,7 +105,7 @@ public class H5Ex_T_ObjectReference {
                         HDF5Constants.H5P_DEFAULT);
             if (group_id >= 0)
                 H5.H5Gclose(group_id);
-            group_id = -1;
+            group_id = HDF5Constants.H5I_INVALID_HID;
         }
         catch (Exception e) {
             e.printStackTrace();
@@ -186,11 +186,11 @@ public class H5Ex_T_ObjectReference {
     }
 
     private static void readObjRef() {
-        long file_id = -1;
-        long dataset_id = -1;
-        long dataspace_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
         int object_type = -1;
-        long object_id = -1;
+        long object_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_ObjectReferenceAttribute.java b/java/examples/datatypes/H5Ex_T_ObjectReferenceAttribute.java
index 8d04454..b38b0a0 100644
--- a/java/examples/datatypes/H5Ex_T_ObjectReferenceAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_ObjectReferenceAttribute.java
@@ -66,11 +66,11 @@ public class H5Ex_T_ObjectReferenceAttribute {
     }
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long group_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[][] dset_data = new byte[DIM0][8];
 
@@ -91,9 +91,9 @@ public class H5Ex_T_ObjectReferenceAttribute {
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 if (dataset_id >= 0)
                     H5.H5Dclose(dataset_id);
-                dataset_id = -1;
+                dataset_id = HDF5Constants.H5I_INVALID_HID;
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -107,7 +107,7 @@ public class H5Ex_T_ObjectReferenceAttribute {
                         HDF5Constants.H5P_DEFAULT);
             if (group_id >= 0)
                 H5.H5Gclose(group_id);
-            group_id = -1;
+            group_id = HDF5Constants.H5I_INVALID_HID;
         }
         catch (Exception e) {
             e.printStackTrace();
@@ -138,7 +138,7 @@ public class H5Ex_T_ObjectReferenceAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -211,12 +211,12 @@ public class H5Ex_T_ObjectReferenceAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         int object_type = -1;
-        long object_id = -1;
+        long object_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[][] dset_data;
 
diff --git a/java/examples/datatypes/H5Ex_T_Opaque.java b/java/examples/datatypes/H5Ex_T_Opaque.java
index c4ee39f..e851fb2 100644
--- a/java/examples/datatypes/H5Ex_T_Opaque.java
+++ b/java/examples/datatypes/H5Ex_T_Opaque.java
@@ -31,10 +31,10 @@ public class H5Ex_T_Opaque {
     private static final int RANK = 1;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long datatype_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long datatype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[] dset_data = new byte[DIM0 * LEN];
         byte[] str_data = { 'O', 'P', 'A', 'Q', 'U', 'E' };
@@ -137,11 +137,11 @@ public class H5Ex_T_Opaque {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long datatype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long type_len = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long datatype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long type_len = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[] dset_data;
         String tag_name = null;
diff --git a/java/examples/datatypes/H5Ex_T_OpaqueAttribute.java b/java/examples/datatypes/H5Ex_T_OpaqueAttribute.java
index 4407451..3e16ab4 100644
--- a/java/examples/datatypes/H5Ex_T_OpaqueAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_OpaqueAttribute.java
@@ -32,11 +32,11 @@ public class H5Ex_T_OpaqueAttribute {
     private static final int RANK = 1;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long datatype_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long datatype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[] dset_data = new byte[DIM0 * LEN];
         byte[] str_data = { 'O', 'P', 'A', 'Q', 'U', 'E' };
@@ -64,7 +64,7 @@ public class H5Ex_T_OpaqueAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -157,11 +157,11 @@ public class H5Ex_T_OpaqueAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long datatype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long datatype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long type_len = -1;
         long[] dims = { DIM0 };
         byte[] dset_data;
diff --git a/java/examples/datatypes/H5Ex_T_String.java b/java/examples/datatypes/H5Ex_T_String.java
index 7b63c35..e497bd8 100644
--- a/java/examples/datatypes/H5Ex_T_String.java
+++ b/java/examples/datatypes/H5Ex_T_String.java
@@ -31,11 +31,11 @@ public class H5Ex_T_String {
     private static final int RANK = 1;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long memtype_id = -1;
-        long filetype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[][] dset_data = new byte[DIM0][SDIM];
         StringBuffer[] str_data = { new StringBuffer("Parting"), new StringBuffer("is such"),
@@ -155,11 +155,11 @@ public class H5Ex_T_String {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long filetype_id = -1;
-        long memtype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long sdim = 0;
         long[] dims = { DIM0 };
         byte[][] dset_data;
diff --git a/java/examples/datatypes/H5Ex_T_StringAttribute.java b/java/examples/datatypes/H5Ex_T_StringAttribute.java
index 0c9d40c..700f6a9 100644
--- a/java/examples/datatypes/H5Ex_T_StringAttribute.java
+++ b/java/examples/datatypes/H5Ex_T_StringAttribute.java
@@ -32,12 +32,12 @@ public class H5Ex_T_StringAttribute {
     private static final int RANK = 1;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long memtype_id = -1;
-        long filetype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM0 };
         byte[][] dset_data = new byte[DIM0][SDIM];
         StringBuffer[] str_data = { new StringBuffer("Parting"), new StringBuffer("is such"),
@@ -79,7 +79,7 @@ public class H5Ex_T_StringAttribute {
                 dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                 H5.H5Sclose(dataspace_id);
-                dataspace_id = -1;
+                dataspace_id = HDF5Constants.H5I_INVALID_HID;
             }
         }
         catch (Exception e) {
@@ -178,12 +178,12 @@ public class H5Ex_T_StringAttribute {
     }
 
     private static void ReadDataset() {
-        long file_id = -1;
-        long filetype_id = -1;
-        long memtype_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long filetype_id = HDF5Constants.H5I_INVALID_HID;
+        long memtype_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long sdim = 0;
         long[] dims = { DIM0 };
         byte[][] dset_data;
diff --git a/java/examples/datatypes/H5Ex_T_VLString.java b/java/examples/datatypes/H5Ex_T_VLString.java
index 933b0b4..8a29e60 100644
--- a/java/examples/datatypes/H5Ex_T_VLString.java
+++ b/java/examples/datatypes/H5Ex_T_VLString.java
@@ -25,10 +25,10 @@ public class H5Ex_T_VLString
     private static String DATASETNAME = "DS1";
 
     private static void createDataset() {
-        long file_id = -1;
-        long type_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long type_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         int rank = 1;
         String[] str_data = { "Parting", "is such", "sweet", "sorrow." };
         long[] dims = { str_data.length };
@@ -92,9 +92,9 @@ public class H5Ex_T_VLString
     }
 
     private static void readDataset() {
-        long file_id = -1;
-        long type_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long type_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         String[] str_data = { "", "", "", "" };
 
         try {
diff --git a/java/examples/groups/H5Ex_G_Compact.java b/java/examples/groups/H5Ex_G_Compact.java
index 0ae98c9..313c9c7 100644
--- a/java/examples/groups/H5Ex_G_Compact.java
+++ b/java/examples/groups/H5Ex_G_Compact.java
@@ -59,9 +59,9 @@ public class H5Ex_G_Compact {
     }
 
     public static void CreateGroup() {
-        long file_id = -1;
-        long group_id = -1;
-        long fapl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
+        long fapl_id = HDF5Constants.H5I_INVALID_HID;
         H5G_info_t ginfo;
         long size;
 
diff --git a/java/examples/groups/H5Ex_G_Corder.java b/java/examples/groups/H5Ex_G_Corder.java
index 61b5b7f..5df850e 100644
--- a/java/examples/groups/H5Ex_G_Corder.java
+++ b/java/examples/groups/H5Ex_G_Corder.java
@@ -24,10 +24,10 @@ public class H5Ex_G_Corder {
     private static String FILE = "H5Ex_G_Corder.h5";
 
     private static void CreateGroup() throws Exception {
-        long file_id = -1;
-        long group_id = -1;
-        long subgroup_id = -1;
-        long gcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
+        long subgroup_id = HDF5Constants.H5I_INVALID_HID;
+        long gcpl_id = HDF5Constants.H5I_INVALID_HID;
         int status;
         H5G_info_t ginfo;
         int i;
diff --git a/java/examples/groups/H5Ex_G_Create.java b/java/examples/groups/H5Ex_G_Create.java
index 16b2028..9304538 100644
--- a/java/examples/groups/H5Ex_G_Create.java
+++ b/java/examples/groups/H5Ex_G_Create.java
@@ -24,8 +24,8 @@ public class H5Ex_G_Create {
     private static String GROUPNAME = "G1";
 
     private static void CreateGroup() {
-        long file_id = -1;
-        long group_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
 
         // Create a new file using default properties.
         try {
diff --git a/java/examples/groups/H5Ex_G_Intermediate.java b/java/examples/groups/H5Ex_G_Intermediate.java
index 130ec09..9f0eedd 100644
--- a/java/examples/groups/H5Ex_G_Intermediate.java
+++ b/java/examples/groups/H5Ex_G_Intermediate.java
@@ -30,9 +30,9 @@ public class H5Ex_G_Intermediate {
 
     private void CreateGroup() throws Exception {
 
-        long file_id = -1;
-        long group_id = -1;
-        long gcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
+        long gcpl_id = HDF5Constants.H5I_INVALID_HID;
 
         try {
             // Create a new file_id using the default properties.
diff --git a/java/examples/groups/H5Ex_G_Iterate.java b/java/examples/groups/H5Ex_G_Iterate.java
index 47f55fe..af46712 100644
--- a/java/examples/groups/H5Ex_G_Iterate.java
+++ b/java/examples/groups/H5Ex_G_Iterate.java
@@ -56,7 +56,7 @@ public class H5Ex_G_Iterate {
     }
 
     private static void do_iterate() {
-        long file_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
 
         // Open a file using default properties.
         try {
diff --git a/java/examples/groups/H5Ex_G_Phase.java b/java/examples/groups/H5Ex_G_Phase.java
index b1c2afc..67a2f53 100644
--- a/java/examples/groups/H5Ex_G_Phase.java
+++ b/java/examples/groups/H5Ex_G_Phase.java
@@ -59,11 +59,11 @@ public class H5Ex_G_Phase {
     }
 
     private static void CreateGroup() {
-        long file_id = -1;
-        long group_id = -1;
-        long subgroup_id = -1;
-        long fapl_id = -1;
-        long gcpl_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
+        long subgroup_id = HDF5Constants.H5I_INVALID_HID;
+        long fapl_id = HDF5Constants.H5I_INVALID_HID;
+        long gcpl_id = HDF5Constants.H5I_INVALID_HID;
         H5G_info_t ginfo;
         String name = "G0"; // Name of subgroup_id
         int i;
diff --git a/java/examples/groups/H5Ex_G_Traverse.java b/java/examples/groups/H5Ex_G_Traverse.java
index 3410c63..5378778 100644
--- a/java/examples/groups/H5Ex_G_Traverse.java
+++ b/java/examples/groups/H5Ex_G_Traverse.java
@@ -42,7 +42,7 @@ public class H5Ex_G_Traverse {
     public static H5L_iterate_cb iter_cb = new H5L_iter_callbackT();
 
     private static void OpenGroup() {
-        long file_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
         H5O_info_t infobuf;
         opdata od = new opdata();
 
diff --git a/java/examples/groups/H5Ex_G_Visit.java b/java/examples/groups/H5Ex_G_Visit.java
index 0e935de..9cc8ecd 100644
--- a/java/examples/groups/H5Ex_G_Visit.java
+++ b/java/examples/groups/H5Ex_G_Visit.java
@@ -46,7 +46,7 @@ public class H5Ex_G_Visit {
 
     private void VisitGroup() throws Exception {
 
-        long file_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
 
         try {
             // Open file
diff --git a/java/examples/intro/H5_CreateAttribute.java b/java/examples/intro/H5_CreateAttribute.java
index 12a09a6..949a770 100644
--- a/java/examples/intro/H5_CreateAttribute.java
+++ b/java/examples/intro/H5_CreateAttribute.java
@@ -27,10 +27,10 @@ public class H5_CreateAttribute {
     private static String DATASETATTRIBUTE = "Units";
 
     private static void CreateDatasetAttribute() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long attribute_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long attribute_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims1 = { DIM_X, DIM_Y };
         long[] dims = { 2 };
         int[] attr_data = { 100, 200 };
diff --git a/java/examples/intro/H5_CreateDataset.java b/java/examples/intro/H5_CreateDataset.java
index f26e6b3..f938be2 100644
--- a/java/examples/intro/H5_CreateDataset.java
+++ b/java/examples/intro/H5_CreateDataset.java
@@ -26,9 +26,9 @@ public class H5_CreateDataset {
     private static final int DIM_Y = 6;
 
     private static void CreateDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
 
         // Create a new file using default properties.
diff --git a/java/examples/intro/H5_CreateFile.java b/java/examples/intro/H5_CreateFile.java
index 078d1d7..d48ba6c 100644
--- a/java/examples/intro/H5_CreateFile.java
+++ b/java/examples/intro/H5_CreateFile.java
@@ -23,7 +23,7 @@ public class H5_CreateFile {
     static final String FILENAME = "H5_CreateFile.h5";
 
     private static void CreateFile() {
-        long file_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
 
         // Create a new file using default properties.
         try {
diff --git a/java/examples/intro/H5_CreateGroup.java b/java/examples/intro/H5_CreateGroup.java
index 640e5f6..c0bb954 100644
--- a/java/examples/intro/H5_CreateGroup.java
+++ b/java/examples/intro/H5_CreateGroup.java
@@ -24,8 +24,8 @@ public class H5_CreateGroup {
     private static String GROUPNAME = "MyGroup";
 
     private static void CreateGroup() {
-        long file_id = -1;
-        long group_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
 
         // Create a new file using default properties.
         try {
diff --git a/java/examples/intro/H5_CreateGroupAbsoluteRelative.java b/java/examples/intro/H5_CreateGroupAbsoluteRelative.java
index a445604..f2c6168 100644
--- a/java/examples/intro/H5_CreateGroupAbsoluteRelative.java
+++ b/java/examples/intro/H5_CreateGroupAbsoluteRelative.java
@@ -26,10 +26,10 @@ public class H5_CreateGroupAbsoluteRelative {
     private static String GROUPNAME_B = "GroupB";
 
     private static void CreateGroupAbsoluteAndRelative() {
-        long file_id = -1;
-        long group1_id = -1;
-        long group2_id = -1;
-        long group3_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long group1_id = HDF5Constants.H5I_INVALID_HID;
+        long group2_id = HDF5Constants.H5I_INVALID_HID;
+        long group3_id = HDF5Constants.H5I_INVALID_HID;
 
         // Create a new file using default properties.
         try {
diff --git a/java/examples/intro/H5_CreateGroupDataset.java b/java/examples/intro/H5_CreateGroupDataset.java
index 22874a8..f1d1cba 100644
--- a/java/examples/intro/H5_CreateGroupDataset.java
+++ b/java/examples/intro/H5_CreateGroupDataset.java
@@ -31,12 +31,12 @@ public class H5_CreateGroupDataset {
     private static final int DIM2_Y = 10;
 
     private static void h5_crtgrpd() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
-        long group_id = -1;
-        long group1_id = -1;
-        long group2_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
+        long group_id = HDF5Constants.H5I_INVALID_HID;
+        long group1_id = HDF5Constants.H5I_INVALID_HID;
+        long group2_id = HDF5Constants.H5I_INVALID_HID;
         int[][] dset1_data = new int[DIM1_X][DIM1_Y];
         int[][] dset2_data = new int[DIM2_X][DIM2_Y];
         long[] dims1 = { DIM1_X, DIM1_Y };
@@ -107,7 +107,7 @@ public class H5_CreateGroupDataset {
         try {
             if (dataspace_id >= 0)
                 H5.H5Sclose(dataspace_id);
-            dataspace_id = -1;
+            dataspace_id = HDF5Constants.H5I_INVALID_HID;
         }
         catch (Exception e) {
             e.printStackTrace();
@@ -117,7 +117,7 @@ public class H5_CreateGroupDataset {
         try {
             if (dataset_id >= 0)
                 H5.H5Dclose(dataset_id);
-            dataset_id = -1;
+            dataset_id = HDF5Constants.H5I_INVALID_HID;
         }
         catch (Exception e) {
             e.printStackTrace();
diff --git a/java/examples/intro/H5_ReadWrite.java b/java/examples/intro/H5_ReadWrite.java
index 6ba3bc2..67e1ac5 100644
--- a/java/examples/intro/H5_ReadWrite.java
+++ b/java/examples/intro/H5_ReadWrite.java
@@ -26,9 +26,9 @@ public class H5_ReadWrite {
     private static final int DIM_Y = 6;
 
     private static void ReadWriteDataset() {
-        long file_id = -1;
-        long dataspace_id = -1;
-        long dataset_id = -1;
+        long file_id = HDF5Constants.H5I_INVALID_HID;
+        long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+        long dataset_id = HDF5Constants.H5I_INVALID_HID;
         long[] dims = { DIM_X, DIM_Y };
         int[][] dset_data = new int[DIM_X][DIM_Y];