Primary change is HDFFV-11212 - new refs and JNI (#372)

* OESS-98 convert plugin option to FetchContent, add tests

* Fixes for pkcfg files because of plugin option

* OESS-98 fix tools test for plugins

* Keep doxygen comments under 100 chars long - format hint

* Whitespace

* HDFFV-11144 - Reclassify CMake messages

* HDFFV-11099/11100 added help text

* Reworked switch statement to compare string instead

* Fix typo

* Update CDash mode

* Correct name of threadsafe

* Correct option name

* Undo accidental commit

* Note LLVM 10 to 11 format default changes

* Update format plugin

* Undo clang-format version 11 changes

* One more correction

* Update supported platforms

* Revert whitespace changes

* Correct whitespace

* Changes from PR#3

* HDFFV-11213 added option to control gcc10 warnings diagnostics

* HDFFV-11212 Use the new references correctly in JNI utility and tests

* format source

* Fix typo

* Add new test file

* HDFFV-11212 - update test and remove unused arg

* Minor non-space formatting changes

* Use H5I_INVALID_ID instead of "-1"

* source formatting

* add missing testfile, update jni function

* Undo commit of debug code

* remove mislocated file

* Fix h5repack test for handling of fapls and id close

* Update h5diff test files usage text

* HDFFV-11212 add new ref tests for JNI export dataset

* src format update

* Remove blank line typo

* src format typo

* long double requires %Lg

* Another long double foramt specifer S.B. %Lg

* issue with t128bit test

* Windows issue with h5dump and type.

* Fix review issues

* refactor function nesting and fix error checks

* format fixes

* Remove untested functions and javadoc quiet comments

* Restore TRY block.

* Change string append errors to memory exception

* revert to H5_JNI_FATAL_ERROR - support functions need work

* Add assertion error for h5util functions

* remove duplicate function

* format fix

* Revert HD function error handling

* Update copyright comments

18 files changed, 132 insertions, 132 deletions

diff --git a/java/examples/datasets/H5Ex_D_Alloc.java b/java/examples/datasets/H5Ex_D_Alloc.java
index dd7e7ae..e4fcde2 100644
--- a/java/examples/datasets/H5Ex_D_Alloc.java
+++ b/java/examples/datasets/H5Ex_D_Alloc.java
@@ -65,11 +65,11 @@ 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 9dcfdb3..2298791 100644
--- a/java/examples/datasets/H5Ex_D_Checksum.java
+++ b/java/examples/datasets/H5Ex_D_Checksum.java
@@ -93,10 +93,10 @@ 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];
@@ -193,9 +193,9 @@ 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 3afa53c..fdbc47d 100644
--- a/java/examples/datasets/H5Ex_D_Chunk.java
+++ b/java/examples/datasets/H5Ex_D_Chunk.java
@@ -66,10 +66,10 @@ 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];
@@ -201,10 +201,10 @@ 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 347c05c..509b221 100644
--- a/java/examples/datasets/H5Ex_D_Compact.java
+++ b/java/examples/datasets/H5Ex_D_Compact.java
@@ -60,10 +60,10 @@ 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];
 
@@ -163,10 +163,10 @@ 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 5cf03af..c88234c 100644
--- a/java/examples/datasets/H5Ex_D_External.java
+++ b/java/examples/datasets/H5Ex_D_External.java
@@ -34,10 +34,10 @@ 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];
 
@@ -138,9 +138,9 @@ 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 a19c026..c8b905e 100644
--- a/java/examples/datasets/H5Ex_D_FillValue.java
+++ b/java/examples/datasets/H5Ex_D_FillValue.java
@@ -40,10 +40,10 @@ 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 67d15bb..cbe6be9 100644
--- a/java/examples/datasets/H5Ex_D_Gzip.java
+++ b/java/examples/datasets/H5Ex_D_Gzip.java
@@ -95,10 +95,10 @@ 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];
@@ -196,9 +196,9 @@ 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 57dfa6a..6174478 100644
--- a/java/examples/datasets/H5Ex_D_Hyperslab.java
+++ b/java/examples/datasets/H5Ex_D_Hyperslab.java
@@ -34,9 +34,9 @@ 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];
 
@@ -142,10 +142,10 @@ 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 d995a02..417d88b 100644
--- a/java/examples/datasets/H5Ex_D_Nbit.java
+++ b/java/examples/datasets/H5Ex_D_Nbit.java
@@ -96,11 +96,11 @@ 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];
@@ -157,9 +157,9 @@ 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 3f6e9ac..cf33057 100644
--- a/java/examples/datasets/H5Ex_D_ReadWrite.java
+++ b/java/examples/datasets/H5Ex_D_ReadWrite.java
@@ -32,9 +32,9 @@ 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];
 
@@ -109,8 +109,8 @@ 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 9677e75..9e705bd 100644
--- a/java/examples/datasets/H5Ex_D_Shuffle.java
+++ b/java/examples/datasets/H5Ex_D_Shuffle.java
@@ -122,10 +122,10 @@ 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];
@@ -229,9 +229,9 @@ 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 5818371..22ee2d3 100644
--- a/java/examples/datasets/H5Ex_D_Sofloat.java
+++ b/java/examples/datasets/H5Ex_D_Sofloat.java
@@ -96,10 +96,10 @@ 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];
@@ -213,9 +213,9 @@ 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 3f5f170..b2f0a29 100644
--- a/java/examples/datasets/H5Ex_D_Soint.java
+++ b/java/examples/datasets/H5Ex_D_Soint.java
@@ -96,10 +96,10 @@ 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];
@@ -195,9 +195,9 @@ 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 57ba873..8891bc9 100644
--- a/java/examples/datasets/H5Ex_D_Szip.java
+++ b/java/examples/datasets/H5Ex_D_Szip.java
@@ -95,10 +95,10 @@ 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];
@@ -196,9 +196,9 @@ 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 04bfa2e..7f0cf5a 100644
--- a/java/examples/datasets/H5Ex_D_Transform.java
+++ b/java/examples/datasets/H5Ex_D_Transform.java
@@ -36,10 +36,10 @@ 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];
@@ -144,9 +144,9 @@ 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 925023a..deecd7c 100644
--- a/java/examples/datasets/H5Ex_D_UnlimitedAdd.java
+++ b/java/examples/datasets/H5Ex_D_UnlimitedAdd.java
@@ -39,10 +39,10 @@ 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 };
@@ -143,9 +143,9 @@ 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 };
@@ -293,9 +293,9 @@ 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 40ddc60..2421610 100644
--- a/java/examples/datasets/H5Ex_D_UnlimitedGzip.java
+++ b/java/examples/datasets/H5Ex_D_UnlimitedGzip.java
@@ -99,10 +99,10 @@ 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 };
@@ -200,9 +200,9 @@ 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 };
@@ -350,10 +350,10 @@ 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 0476bc1..966ab03 100644
--- a/java/examples/datasets/H5Ex_D_UnlimitedMod.java
+++ b/java/examples/datasets/H5Ex_D_UnlimitedMod.java
@@ -39,10 +39,10 @@ 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 };
@@ -143,9 +143,9 @@ 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;
@@ -279,9 +279,9 @@ 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;