23 files changed, 399 insertions, 35 deletions

diff --git a/MANIFEST b/MANIFEST
index 2b48295..6c2018a 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -2900,6 +2900,32 @@
 ./java/src/jni/h5oImp.h
 ./java/src/jni/h5pImp.c
 ./java/src/jni/h5pImp.h
+./java/src/jni/h5pACPLImp.c
+./java/src/jni/h5pACPLImp.h
+./java/src/jni/h5pDAPLImp.c
+./java/src/jni/h5pDAPLImp.h
+./java/src/jni/h5pDCPLImp.c
+./java/src/jni/h5pDCPLImp.h
+./java/src/jni/h5pDXPLImp.c
+./java/src/jni/h5pDXPLImp.h
+./java/src/jni/h5pFAPLImp.c
+./java/src/jni/h5pFAPLImp.h
+./java/src/jni/h5pFCPLImp.c
+./java/src/jni/h5pFCPLImp.h
+./java/src/jni/h5pGAPLImp.c
+./java/src/jni/h5pGAPLImp.h
+./java/src/jni/h5pGCPLImp.c
+./java/src/jni/h5pGCPLImp.h
+./java/src/jni/h5pLAPLImp.c
+./java/src/jni/h5pLAPLImp.h
+./java/src/jni/h5pLCPLImp.c
+./java/src/jni/h5pLCPLImp.h
+./java/src/jni/h5pOCPLImp.c
+./java/src/jni/h5pOCPLImp.h
+./java/src/jni/h5pOCpyPLImp.c
+./java/src/jni/h5pOCpyPLImp.h
+./java/src/jni/h5pStrCPLImp.c
+./java/src/jni/h5pStrCPLImp.h
 ./java/src/jni/h5plImp.c
 ./java/src/jni/h5plImp.h
 ./java/src/jni/h5rImp.c
diff --git a/java/src/jni/h5aImp.c b/java/src/jni/h5aImp.c
index 666626f..e47515d 100644
--- a/java/src/jni/h5aImp.c
+++ b/java/src/jni/h5aImp.c
@@ -1533,6 +1533,9 @@ Java_hdf_hdf5lib_H5_H5Adelete
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Adelete: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, attrName, NULL, "H5Adelete: attribute name not pinned");
 
     if ((status = H5Adelete((hid_t)loc_id, attrName)) < 0)
@@ -1580,6 +1583,9 @@ Java_hdf_hdf5lib_H5__1H5Acreate2
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Acreate2: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, attrName, NULL, "H5Acreate2: attribute name not pinned");
 
     if ((status = H5Acreate2((hid_t)loc_id, attrName, (hid_t)type_id,
@@ -1608,6 +1614,9 @@ Java_hdf_hdf5lib_H5__1H5Aopen
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aopen: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, attrName, NULL, "H5Aopen: attribute name not pinned");
 
     if ((retVal = H5Aopen((hid_t)obj_id, attrName, (hid_t)access_plist)) < 0)
@@ -1634,6 +1643,9 @@ Java_hdf_hdf5lib_H5__1H5Aopen_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aopen_by_idx: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Aopen_by_idx: object name not pinned");
 
     if ((retVal = H5Aopen_by_idx((hid_t)loc_id, objName, (H5_index_t)idx_type,
@@ -1662,6 +1674,11 @@ Java_hdf_hdf5lib_H5__1H5Acreate_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Acreate_by_name: object name is NULL");
+    if (NULL == attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Acreate_by_name: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Acreate_by_name: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, attr_name, attrName, NULL, "H5Acreate_by_name: attribute name not pinned");
 
@@ -1693,6 +1710,11 @@ Java_hdf_hdf5lib_H5_H5Aexists_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aexists_by_name: object name is NULL");
+    if (NULL == attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aexists_by_name: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Aexists_by_name: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, attr_name, attrName, NULL, "H5Aexists_by_name: attribute name not pinned");
 
@@ -1725,6 +1747,11 @@ Java_hdf_hdf5lib_H5_H5Arename
 
     UNUSED(clss);
 
+    if (NULL == old_attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Arename: old attribute name is NULL");
+    if (NULL == new_attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Arename: new attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, old_attr_name, oldAttrName, NULL, "H5Arename: old attribute name not pinned");
     PIN_JAVA_STRING(ENVONLY, new_attr_name, newAttrName, NULL, "H5Arename: new attribute name not pinned");
 
@@ -1756,6 +1783,13 @@ Java_hdf_hdf5lib_H5_H5Arename_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Arename_by_name: object name is NULL");
+    if (NULL == old_attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Arename_by_name: old attribute name is NULL");
+    if (NULL == new_attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Arename_by_name: new attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Arename_by_name: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, old_attr_name, oldAttrName, NULL, "H5Arename_by_name: old attribute name not pinned");
     PIN_JAVA_STRING(ENVONLY, new_attr_name, newAttrName, NULL, "H5Arename_by_name: new attribute name not pinned");
@@ -1790,6 +1824,9 @@ Java_hdf_hdf5lib_H5_H5Aget_1name_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aget_name_by_idx: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Aget_name_by_idx: object name not pinned");
 
     /* Get the length of the attribute name */
@@ -1883,6 +1920,9 @@ Java_hdf_hdf5lib_H5_H5Aget_1info_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aget_info_by_idx: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Aget_info_by_idx: object name not pinned");
 
     if ((status = H5Aget_info_by_idx((hid_t)loc_id, objName, (H5_index_t)idx_type,
@@ -1921,6 +1961,11 @@ Java_hdf_hdf5lib_H5_H5Aget_1info_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aget_info_by_name: object name is NULL");
+    if (NULL == attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aget_info_by_name: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Aget_info_by_name: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, attr_name, attrName, NULL, "H5Aget_info_by_name: attribute name not pinned");
 
@@ -1958,6 +2003,11 @@ Java_hdf_hdf5lib_H5_H5Adelete_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Adelete_by_name: object name is NULL");
+    if (NULL == attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Adelete_by_name: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Adelete_by_name: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, attr_name, attrName, NULL, "H5Adelete_by_name: attribute name not pinned");
 
@@ -1987,6 +2037,9 @@ Java_hdf_hdf5lib_H5_H5Aexists
 
     UNUSED(clss);
 
+    if (NULL == attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aexists: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, attr_name, attrName, NULL, "H5Aexists: attribute name not pinned");
 
     if ((bval = H5Aexists((hid_t)obj_id, attrName)) < 0)
@@ -2015,6 +2068,9 @@ Java_hdf_hdf5lib_H5_H5Adelete_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Adelete_by_idx: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Adelete_by_idx: object name not pinned");
 
     if ((status = H5Adelete_by_idx((hid_t)loc_id, objName, (H5_index_t)idx_type, (H5_iter_order_t)order, (hsize_t)n, (hid_t)lapl_id)) < 0)
@@ -2041,6 +2097,11 @@ Java_hdf_hdf5lib_H5__1H5Aopen_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == obj_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aopen_by_name: object name is NULL");
+    if (NULL == attr_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aopen_by_name: attribute name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, obj_name, objName, NULL, "H5Aopen_by_name: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, attr_name, attrName, NULL, "H5Aopen_by_name: attribute name not pinned");
 
@@ -2187,6 +2248,8 @@ Java_hdf_hdf5lib_H5_H5Aiterate_1by_1name
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aiterate_by_name: op_data is NULL");
     if (NULL == callback_op)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aiterate_by_name: callback_op is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Aiterate_by_name: object name is NULL");
 
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Aiterate_by_name: object name not pinned");
 
diff --git a/java/src/jni/h5dImp.c b/java/src/jni/h5dImp.c
index 0ed3b6e..92a3723 100644
--- a/java/src/jni/h5dImp.c
+++ b/java/src/jni/h5dImp.c
@@ -69,6 +69,9 @@ Java_hdf_hdf5lib_H5__1H5Dcreate
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Dcreate: dataset name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, dsetName, NULL, "H5Dcreate: dataset name not pinned");
 
     if ((dset_id = H5Dcreate2((hid_t)loc_id, dsetName, (hid_t)type_id, (hid_t)space_id, H5P_DEFAULT, (hid_t)create_plist_id, H5P_DEFAULT)) < 0)
@@ -95,6 +98,9 @@ Java_hdf_hdf5lib_H5__1H5Dopen
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Dopen: dataset name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, dsetName, NULL, "H5Dopen: dataset name not pinned");
 
     if ((dset_id = H5Dopen2((hid_t)loc_id, dsetName, H5P_DEFAULT)))
@@ -1677,6 +1683,9 @@ Java_hdf_hdf5lib_H5__1H5Dcreate2
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Dcreate2: dataset name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, dsetName, NULL, "H5Dcreate2: dataset name not pinned");
 
     if ((dset_id = H5Dcreate2((hid_t)loc_id, dsetName, (hid_t)type_id, (hid_t)space_id, (hid_t)link_plist_id, (hid_t)create_plist_id, (hid_t)access_plist_id)) < 0)
@@ -1703,6 +1712,9 @@ Java_hdf_hdf5lib_H5__1H5Dopen2
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Dopen2: dataset name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, dsetName, NULL, "H5Dopen2: dataset name not pinned");
 
     if ((dset_id = H5Dopen2((hid_t)loc_id, dsetName, (hid_t)access_plist)) < 0)
diff --git a/java/src/jni/h5eImp.c b/java/src/jni/h5eImp.c
index 1c5a5a9..4ab00df 100644
--- a/java/src/jni/h5eImp.c
+++ b/java/src/jni/h5eImp.c
@@ -94,6 +94,13 @@ Java_hdf_hdf5lib_H5_H5Eregister_1class
 
     UNUSED(cls);
 
+    if (NULL == cls_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Eregister_class: class name is NULL");
+    if (NULL == lib_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Eregister_class: lib name is NULL");
+    if (NULL == version)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Eregister_class: version string is NULL");
+
     PIN_JAVA_STRING(ENVONLY, cls_name, the_cls_name, NULL, "H5Eregister_class: class name not pinned");
     PIN_JAVA_STRING(ENVONLY, lib_name, the_lib_name, NULL, "H5Eregister_class: lib name not pinned");
     PIN_JAVA_STRING(ENVONLY, version, the_version, NULL, "H5Eregister_class: version string not pinned");
@@ -171,6 +178,8 @@ Java_hdf_hdf5lib_H5_H5Ecreate_1msg
 
     if (err_id < 0)
         H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Ecreate_msg: invalid error class ID");
+    if (NULL == err_msg)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ecreate_msg: error message string is NULL");
 
     PIN_JAVA_STRING(ENVONLY, err_msg, the_err_msg, NULL, "H5Ecreate_msg: error message string not pinned");
 
@@ -376,13 +385,19 @@ Java_hdf_hdf5lib_H5_H5Epush2
     UNUSED(cls);
 
     if (stk_id < 0)
-        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush: invalid error stack ID");
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush2: invalid error stack ID");
     if (class_id < 0)
-        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush: invalid error class ID");
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush2: invalid error class ID");
     if (major_id < 0)
-        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush: invalid major error class ID");
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush2: invalid major error class ID");
     if (minor_id < 0)
-        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush: invalid minor error class ID");
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Epush2: invalid minor error class ID");
+    if (NULL == filename)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Epush2: filename is NULL");
+    if (NULL == funcname)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Epush2: function name is NULL");
+    if (NULL == err_desc)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Epush2: error message is NULL");
 
     PIN_JAVA_STRING(ENVONLY, filename, fName, NULL, "H5Epush2: filename not pinned");
     PIN_JAVA_STRING(ENVONLY, funcname, fncName, NULL, "H5Epush2: function name not pinned");
diff --git a/java/src/jni/h5fImp.c b/java/src/jni/h5fImp.c
index 624c788..d145c6a 100644
--- a/java/src/jni/h5fImp.c
+++ b/java/src/jni/h5fImp.c
@@ -47,6 +47,9 @@ Java_hdf_hdf5lib_H5__1H5Fopen
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Fopen: file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, fileName, NULL, "H5Fopen: file name not pinned");
 
     if ((status = H5Fopen(fileName, (unsigned)flags, (hid_t)access_id)) < 0)
@@ -73,6 +76,9 @@ Java_hdf_hdf5lib_H5__1H5Fcreate
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Fcreate: file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, fileName, NULL, "H5Fcreate: file name not pinned");
 
     if ((status = H5Fcreate(fileName, (unsigned)flags, create_id, access_id)) < 0)
@@ -159,6 +165,9 @@ Java_hdf_hdf5lib_H5_H5Fis_1hdf5
     H5_UNIMPLEMENTED(ENVONLY, "H5Fis_hdf5: not implemented");
 #endif
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Fis_hdf5: file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, fileName, NULL, "H5Fis_hdf5: file name not pinned");
 
     if ((bval = H5Fis_hdf5(fileName)) < 0)
@@ -187,6 +196,9 @@ Java_hdf_hdf5lib_H5_H5Fis_1accessible
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Fis_accessible: file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, fileName, NULL, "H5Fis_accessible: file name not pinned");
 
     if ((bval = H5Fis_accessible(fileName, (hid_t)file_id)) < 0)
@@ -295,6 +307,9 @@ Java_hdf_hdf5lib_H5_H5Fmount
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Fmount: file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, fileName, NULL, "H5Fmount: file name not pinned");
 
     if ((status = H5Fmount((hid_t)loc_id, fileName, (hid_t)child_id, (hid_t)plist_id)) < 0)
@@ -321,6 +336,9 @@ Java_hdf_hdf5lib_H5_H5Funmount
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Funmount: file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, fileName, NULL, "H5Funmount: file name not pinned");
 
     if ((status = H5Funmount((hid_t)loc_id, fileName)) < 0)
diff --git a/java/src/jni/h5gImp.c b/java/src/jni/h5gImp.c
index 8adabca..b579f31 100644
--- a/java/src/jni/h5gImp.c
+++ b/java/src/jni/h5gImp.c
@@ -126,6 +126,9 @@ Java_hdf_hdf5lib_H5__1H5Gcreate2
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Gcreate2: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Gcreate2: group name not pinned");
 
     if ((group_id = H5Gcreate2((hid_t)loc_id, grpName, (hid_t)link_plist_id, (hid_t)create_plist_id, (hid_t)access_plist_id)) < 0)
@@ -172,6 +175,9 @@ Java_hdf_hdf5lib_H5__1H5Gopen2
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Gopen2: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Gopen2: group name not pinned");
 
     if ((group_id = H5Gopen2((hid_t)loc_id, grpName, (hid_t)access_plist_id)) < 0)
@@ -245,6 +251,9 @@ Java_hdf_hdf5lib_H5_H5Gget_1info_1by_1name
 
     UNUSED(cls);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Gget_info_by_name: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Gget_info_by_name: group name not pinned");
 
     if ((ret_val = H5Gget_info_by_name((hid_t)loc_id, grpName, &group_info, (hid_t)lapl_id)) < 0)
@@ -281,6 +290,9 @@ Java_hdf_hdf5lib_H5_H5Gget_1info_1by_1idx
 
     UNUSED(cls);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Gget_info_by_idx: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Gget_info_by_idx: group name not pinned");
 
     if ((ret_val = H5Gget_info_by_idx((hid_t)loc_id, grpName, cindex_type,
diff --git a/java/src/jni/h5lImp.c b/java/src/jni/h5lImp.c
index 5999270..af6c8ba 100644
--- a/java/src/jni/h5lImp.c
+++ b/java/src/jni/h5lImp.c
@@ -59,6 +59,11 @@ Java_hdf_hdf5lib_H5_H5Lcopy
 
     UNUSED(clss);
 
+    if (NULL == cur_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcopy: src name is NULL");
+    if (NULL == dst_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcopy: dest name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, cur_name, lCurName, NULL, "H5Lcopy: src name not pinned");
     PIN_JAVA_STRING(ENVONLY, dst_name, lDstName, NULL, "H5Lcopy: dest name not pinned");
 
@@ -89,6 +94,13 @@ Java_hdf_hdf5lib_H5_H5Lcreate_1external
 
     UNUSED(clss);
 
+    if (NULL == file_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcreate_external: file name is NULL");
+    if (NULL == cur_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcreate_external: object name is NULL");
+    if (NULL == dst_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcreate_external: link name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, file_name, lFileName, NULL, "H5Lcreate_external: file name not pinned");
     PIN_JAVA_STRING(ENVONLY, cur_name, lCurName, NULL, "H5Lcreate_external: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, dst_name, lDstName, NULL, "H5Lcreate_external: link name not pinned");
@@ -121,6 +133,11 @@ Java_hdf_hdf5lib_H5_H5Lcreate_1hard
 
     UNUSED(clss);
 
+    if (NULL == cur_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcreate_hard: object name is NULL");
+    if (NULL == dst_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcreate_hard: link name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, cur_name, lCurName, NULL, "H5Lcreate_hard: object name not pinned");
     PIN_JAVA_STRING(ENVONLY, dst_name, lDstName, NULL, "H5Lcreate_hard: link name not pinned");
 
@@ -150,6 +167,11 @@ Java_hdf_hdf5lib_H5_H5Lcreate_1soft
 
     UNUSED(clss);
 
+    if (NULL == cur_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcreate_soft: link target is NULL");
+    if (NULL == dst_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lcreate_soft: link name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, cur_name, linkTarget, NULL, "H5Lcreate_soft: link target not pinned");
     PIN_JAVA_STRING(ENVONLY, dst_name, linkName, NULL, "H5Lcreate_soft: link name not pinned");
 
@@ -177,6 +199,9 @@ Java_hdf_hdf5lib_H5_H5Ldelete
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ldelete: link name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, linkName, NULL, "H5Ldelete: link name not pinned");
 
     if ((status = H5Ldelete((hid_t)loc_id, linkName, (hid_t)access_id)) < 0)
@@ -203,6 +228,9 @@ Java_hdf_hdf5lib_H5_H5Ldelete_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ldelete_by_idx: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, groupName, NULL, "H5Ldelete_by_idx: group name not pinned");
 
     if ((status = H5Ldelete_by_idx((hid_t)loc_id, groupName, (H5_index_t)index_field, (H5_iter_order_t)order, n, (hid_t)access_id)) < 0)
@@ -227,6 +255,9 @@ Java_hdf_hdf5lib_H5_H5Lexists
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lexists: link name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, linkName, NULL, "H5Lexists: link name not pinned");
 
     if ((bval = H5Lexists((hid_t)loc_id, linkName, (hid_t)access_id)) < 0)
@@ -258,6 +289,9 @@ Java_hdf_hdf5lib_H5_H5Lget_1info
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lget_info: link name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, linkName, NULL, "H5Lget_info: link name not pinned");
 
     if ((status = H5Lget_info((hid_t)loc_id, linkName, &infobuf, (hid_t)access_id)) < 0)
@@ -296,6 +330,9 @@ Java_hdf_hdf5lib_H5_H5Lget_1info_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lget_info_by_idx: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, groupName, NULL, "H5Lget_info_by_idx: group name not pinned");
 
     if ((status = H5Lget_info_by_idx((hid_t)loc_id, groupName, (H5_index_t)index_field, (H5_iter_order_t)order, (hsize_t)link_n, &infobuf, (hid_t)access_id)) < 0)
@@ -333,6 +370,9 @@ Java_hdf_hdf5lib_H5_H5Lget_1name_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lget_name_by_idx: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, groupName, NULL, "H5Lget_name_by_idx: group name not pinned");
 
     /* Get the length of the link name */
@@ -378,6 +418,9 @@ Java_hdf_hdf5lib_H5_H5Lget_1value
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lget_value: link name is NULL");
+
     infobuf.type = H5L_TYPE_ERROR;
 
     PIN_JAVA_STRING(ENVONLY, name, linkName, NULL, "H5Lget_value: link name not pinned");
@@ -465,6 +508,9 @@ Java_hdf_hdf5lib_H5_H5Lget_1value_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lget_val_by_idx: group name is NULL");
+
     infobuf.type = H5L_TYPE_ERROR;
 
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Lget_val_by_idx: group name not pinned");
@@ -551,6 +597,11 @@ Java_hdf_hdf5lib_H5_H5Lmove
 
     UNUSED(clss);
 
+    if (NULL == cur_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lmove: src name is NULL");
+    if (NULL == dst_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lmove: dest name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, cur_name, lCurName, NULL, "H5Lmove: src name not pinned");
     PIN_JAVA_STRING(ENVONLY, dst_name, lDstName, NULL, "H5Lmove: dest name not pinned");
 
@@ -675,6 +726,8 @@ Java_hdf_hdf5lib_H5_H5Lvisit_1by_1name
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lvisit_by_name: op_data is NULL");
     if (NULL == callback_op)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lvisit_by_name: callback_op is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Lvisit_by_name: group name is NULL");
 
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Lvisit_by_name: group name not pinned");
 
@@ -743,6 +796,8 @@ Java_hdf_hdf5lib_H5_H5Literate_1by_1name
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Literate_by_name: op_data is NULL");
     if (NULL == callback_op)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Literate_by_name: callback_op is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Literate_by_name: group name is NULL");
 
     PIN_JAVA_STRING(ENVONLY, name, groupName, NULL, "H5Literate_by_name: group name not pinned");
 
diff --git a/java/src/jni/h5oImp.c b/java/src/jni/h5oImp.c
index 0b1a984..cc88b81 100644
--- a/java/src/jni/h5oImp.c
+++ b/java/src/jni/h5oImp.c
@@ -56,6 +56,9 @@ Java_hdf_hdf5lib_H5__1H5Oopen
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Oopen: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Oopen: object name not pinned");
 
     if ((status = H5Oopen((hid_t)loc_id, objName, (hid_t)access_plist_id)) < 0)
@@ -104,6 +107,11 @@ Java_hdf_hdf5lib_H5_H5Ocopy
 
     UNUSED(clss);
 
+    if (NULL == cur_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ocopy: src name is NULL");
+    if (NULL == dst_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ocopy: dst name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, cur_name, lCurName, NULL, "H5Ocopy: src name not pinned");
     PIN_JAVA_STRING(ENVONLY, dst_name, lDstName, NULL, "H5Ocopy: dest name not pinned");
 
@@ -204,6 +212,9 @@ Java_hdf_hdf5lib_H5_H5Oget_1info_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Oget_info_by_name: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Oget_info_by_name: object name not pinned");
 
     if ((status = H5Oget_info_by_name2((hid_t)loc_id, objName, &infobuf, (unsigned)fields, (hid_t)access_id)) < 0)
@@ -278,6 +289,9 @@ Java_hdf_hdf5lib_H5_H5Oget_1info_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Oget_info_by_idx: group name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Oget_info_by_idx: group name not pinned");
 
     if ((status = H5Oget_info_by_idx2((hid_t)loc_id, grpName, (H5_index_t)index_field, (H5_iter_order_t)order, (hsize_t)link_n, &infobuf, (unsigned)fields, (hid_t)access_id)) < 0)
@@ -346,6 +360,9 @@ Java_hdf_hdf5lib_H5_H5Olink
 
     UNUSED(clss);
 
+    if (NULL == dst_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Olink: link destination name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, dst_name, linkDstName, NULL, "H5Olink: link destination name not pinned");
 
     if ((status = H5Olink((hid_t)cur_loc_id, (hid_t)dst_loc_id, linkDstName, (hid_t)create_id, (hid_t)access_id)) < 0)
@@ -525,6 +542,8 @@ Java_hdf_hdf5lib_H5_H5Ovisit_1by_1name
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ovisit_by_name: op_data is NULL");
     if (NULL == callback_op)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ovisit_by_name: callback_op is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Ovisit_by_name: object name is NULL");
 
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Ovisit_by_name: object name not pinned");
 
@@ -580,6 +599,9 @@ Java_hdf_hdf5lib_H5_H5Oset_1comment_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Oset_comment_by_name: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Oset_comment_by_name: object name not pinned");
 
     if (NULL != comment)
@@ -651,6 +673,9 @@ Java_hdf_hdf5lib_H5_H5Oget_1comment_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Oget_comment_by_name: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Oget_comment_by_name: object name not pinned");
 
     /* Get the length of the comment */
@@ -692,6 +717,9 @@ Java_hdf_hdf5lib_H5_H5Oexists_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Oexists_by_name: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, objName, NULL, "H5Oexists_by_name: object name not pinned");
 
     if ((bval = H5Oexists_by_name((hid_t)loc_id, objName, (hid_t)access_id)) < 0)
@@ -777,6 +805,9 @@ Java_hdf_hdf5lib_H5__1H5Oopen_1by_1idx
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Oopen_by_idx: object name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, grpName, NULL, "H5Oopen_by_idx: object name not pinned");
 
     if ((retVal = H5Oopen_by_idx((hid_t)loc_id, grpName, (H5_index_t)index_field, (H5_iter_order_t)order, (hsize_t)link_n, (hid_t)lapl_id)) < 0)
diff --git a/java/src/jni/h5pDAPLImp.c b/java/src/jni/h5pDAPLImp.c
index 0afbbd6..fb39b84 100644
--- a/java/src/jni/h5pDAPLImp.c
+++ b/java/src/jni/h5pDAPLImp.c
@@ -119,6 +119,9 @@ Java_hdf_hdf5lib_H5_H5Pset_1efile_1prefix
 
     UNUSED(clss);
 
+    if (NULL == prefix)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_efile_prefix: external file prefix is NULL");
+
     PIN_JAVA_STRING(ENVONLY, prefix, extFilePrefix, NULL, "H5Pset_efile_prefix: external file prefix not pinned");
 
     if ((retVal = H5Pset_efile_prefix((hid_t)dapl_id, extFilePrefix)) < 0)
diff --git a/java/src/jni/h5pDCPLImp.c b/java/src/jni/h5pDCPLImp.c
index 0671843..7559c3b 100644
--- a/java/src/jni/h5pDCPLImp.c
+++ b/java/src/jni/h5pDCPLImp.c
@@ -1008,8 +1008,8 @@ Java_hdf_hdf5lib_H5_H5Pset_1scaleoffset
 
     UNUSED(clss);
 
-    if (scale_factor <= 0)
-        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Pset_scaleoffset: scale factor must be > 0");
+    if (scale_factor < 0)
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Pset_scaleoffset: scale factor must be >= 0");
     if (scale_type != H5Z_SO_FLOAT_DSCALE && scale_type != H5Z_SO_FLOAT_ESCALE && scale_type != H5Z_SO_INT)
         H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Pset_scaleoffset: invalid scale type");
 
@@ -1074,6 +1074,9 @@ Java_hdf_hdf5lib_H5_H5Pset_1external
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_external: file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, fileName, NULL, "H5Pset_external: file name not pinned");
 
     if ((status = H5Pset_external((hid_t)plist, fileName, (off_t)offset, (hsize_t)size)) < 0)
@@ -1189,6 +1192,11 @@ Java_hdf_hdf5lib_H5_H5Pset_1virtual
 
     UNUSED(clss);
 
+    if (NULL == src_file_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_virtual: src_file_name is NULL");
+    if (NULL == src_dset_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_virtual: src_dset_name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, src_file_name, fstr, NULL, "H5Pset_virtual: src_file_name not pinned");
     PIN_JAVA_STRING(ENVONLY, src_dset_name, dstr, NULL, "H5Pset_virtual: src_dset_name not pinned");
 
@@ -1352,6 +1360,9 @@ Java_hdf_hdf5lib_H5_H5Pset_1virtual_1prefix
 
     UNUSED(clss);
 
+    if (NULL == prefix)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_virtual_prefix: virtual prefix is NULL");
+
     PIN_JAVA_STRING(ENVONLY, prefix, virtPrefix, NULL, "H5Pset_virtual_prefix: virtual prefix not pinned");
 
     if ((retVal = H5Pset_virtual_prefix((hid_t)dapl_id, virtPrefix)) < 0)
diff --git a/java/src/jni/h5pDXPLImp.c b/java/src/jni/h5pDXPLImp.c
index 2bdc36b..323fa8c 100644
--- a/java/src/jni/h5pDXPLImp.c
+++ b/java/src/jni/h5pDXPLImp.c
@@ -273,6 +273,9 @@ Java_hdf_hdf5lib_H5_H5Pset_1data_1transform
 
     UNUSED(clss);
 
+    if (NULL == expression)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_data_transform: data transform expression is NULL");
+
     PIN_JAVA_STRING(ENVONLY, expression, express, NULL, "H5Pset_data_transform: data transform expression not pinned");
 
     if ((retVal = H5Pset_data_transform((hid_t)plist_id, express)) < 0)
diff --git a/java/src/jni/h5pFAPLImp.c b/java/src/jni/h5pFAPLImp.c
index aec6581..acfc853 100644
--- a/java/src/jni/h5pFAPLImp.c
+++ b/java/src/jni/h5pFAPLImp.c
@@ -384,6 +384,9 @@ Java_hdf_hdf5lib_H5_H5Pset_1fapl_1log
 
     UNUSED(clss);
 
+    if (NULL == logfile)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_fapl_log: log file name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, logfile, pLogfile, NULL, "H5Pset_fapl_log: log file name not pinned");
 
     if ((retVal = H5Pset_fapl_log((hid_t)fapl_id, pLogfile, (unsigned long long)flags, (size_t)buf_size)) < 0)
@@ -421,10 +424,12 @@ Java_hdf_hdf5lib_H5_H5Pset_1fapl_1multi
         jlongArray memb_fapl, jobjectArray memb_name, jlongArray memb_addr, jboolean relax)
 {
     const char * const *mName = NULL;
+    const char         *utf8 = NULL;
     jboolean            isCopy;
     jboolean            bb;
     jobject             o;
     jstring             rstring;
+    jstring             obj;
     jclass              Sjc;
     size_t              i;
     jlong              *thefaplArray = NULL;
@@ -445,11 +450,8 @@ Java_hdf_hdf5lib_H5_H5Pset_1fapl_1multi
         PIN_LONG_ARRAY(ENVONLY, memb_addr, theaddrArray, &isCopy, "H5Pset_fapl_multi: memb_addr not pinned");
 
     if (memb_name) {
-        jstring obj;
-
         for (i = 0; i < H5FD_MEM_NTYPES; i++) {
-            const char *utf8 = NULL;
-            size_t      str_len;
+            size_t str_len;
 
             if (NULL == (obj = (jstring) ENVPTR->GetObjectArrayElement(ENVONLY, (jobjectArray) memb_name, (jsize) i))) {
                 CHECK_JNI_EXCEPTION(ENVONLY, JNI_FALSE);
@@ -474,6 +476,7 @@ Java_hdf_hdf5lib_H5_H5Pset_1fapl_1multi
                 H5_JNI_FATAL_ERROR(ENVONLY, "H5Pset_fapl_multi: memory allocation failed");
 
             HDstrncpy(member_name[i], utf8, str_len + 1);
+            (member_name[i])[str_len] = '\0';
 
             UNPIN_JAVA_STRING(ENVONLY, obj, utf8);
             utf8 = NULL;
@@ -493,6 +496,8 @@ Java_hdf_hdf5lib_H5_H5Pset_1fapl_1multi
             CHECK_JNI_EXCEPTION(ENVONLY, JNI_FALSE);
 
         for (i = 0; i < H5FD_MEM_NTYPES; i++) {
+            if (!member_name[i]) continue;
+
             if (NULL == (rstring = ENVPTR->NewStringUTF(ENVONLY, member_name[i]))) {
                 CHECK_JNI_EXCEPTION(ENVONLY, JNI_TRUE);
                 H5_JNI_FATAL_ERROR(ENVONLY, "H5Pset_fapl_multi: out of memory - unable to construct string from UTF characters");
@@ -522,7 +527,12 @@ Java_hdf_hdf5lib_H5_H5Pset_1fapl_1multi
     }
 
 done:
-    h5str_array_free(member_name, H5FD_MEM_NTYPES);
+    for (i = 0; i < H5FD_MEM_NTYPES; i++) {
+        if (member_name[i])
+            HDfree(member_name[i]);
+    }
+    if (utf8)
+        UNPIN_JAVA_STRING(ENVONLY, obj, utf8);
     if (theaddrArray)
         UNPIN_LONG_ARRAY(ENVONLY, memb_addr, theaddrArray, (status < 0) ? JNI_ABORT : 0);
     if (thefaplArray)
@@ -621,6 +631,11 @@ Java_hdf_hdf5lib_H5_H5Pset_1fapl_1split
 
     UNUSED(clss);
 
+    if (NULL == metaext)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_fapl_split: metaext is NULL");
+    if (NULL == rawext)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_fapl_split: rawext is NULL");
+
     PIN_JAVA_STRING(ENVONLY, metaext, mstr, NULL, "H5Pset_fapl_split: metaext not pinned");
     PIN_JAVA_STRING(ENVONLY, rawext, rstr, NULL, "H5Pset_fapl_split: rawext not pinned");
 
@@ -1125,12 +1140,17 @@ Java_hdf_hdf5lib_H5_H5Pset_1mdc_1config
     if (NULL == (j_str = (jstring)ENVPTR->GetObjectField(ENVONLY, cache_config, fid)))
         CHECK_JNI_EXCEPTION(ENVONLY, JNI_FALSE);
 
-    PIN_JAVA_STRING(ENVONLY, j_str, str, NULL, "H5Pset_mdc_config: cache_config not pinned");
+    if (j_str) {
+        PIN_JAVA_STRING(ENVONLY, j_str, str, NULL, "H5Pset_mdc_config: cache_config not pinned");
 
-    HDstrncpy(cacheinfo.trace_file_name, str, H5AC__MAX_TRACE_FILE_NAME_LEN + 1);
+        HDstrncpy(cacheinfo.trace_file_name, str, H5AC__MAX_TRACE_FILE_NAME_LEN + 1);
+        cacheinfo.trace_file_name[H5AC__MAX_TRACE_FILE_NAME_LEN] = '\0';
 
-    UNPIN_JAVA_STRING(ENVONLY, j_str, str);
-    str = NULL;
+        UNPIN_JAVA_STRING(ENVONLY, j_str, str);
+        str = NULL;
+    }
+    else
+        HDmemset(cacheinfo.trace_file_name, 0, H5AC__MAX_TRACE_FILE_NAME_LEN + 1);
 
     if (NULL == (fid = ENVPTR->GetFieldID(ENVONLY, cls, "evictions_enabled", "Z")))
         CHECK_JNI_EXCEPTION(ENVONLY, JNI_FALSE);
@@ -1383,6 +1403,9 @@ Java_hdf_hdf5lib_H5_H5Pset_1mdc_1log_1options
 
     UNUSED(clss);
 
+    if (NULL == location)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_mdc_log_options: location string is NULL");
+
     PIN_JAVA_STRING(ENVONLY, location, locStr, NULL, "H5Pset_mdc_log_options: location string not pinned");
 
     if ((retVal = H5Pset_mdc_log_options((hid_t)fapl_id, (hbool_t)is_enabled, locStr, (hbool_t)start_on_access)) < 0)
diff --git a/java/src/jni/h5pImp.c b/java/src/jni/h5pImp.c
index bed23c9..726e08c 100644
--- a/java/src/jni/h5pImp.c
+++ b/java/src/jni/h5pImp.c
@@ -174,6 +174,9 @@ Java_hdf_hdf5lib_H5__1H5Pcreate_1class
     close_callback = close_op;
     copy_callback = copy_op;
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "_H5Pcreate_class: class name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "_H5Pcreate_class: class name not pinned");
 
     if ((class_id = H5Pcreate_class((hid_t)parent_class, cstr, (H5P_cls_create_func_t)H5P_cls_create_cb, (void *) create_data,
@@ -201,6 +204,9 @@ Java_hdf_hdf5lib_H5__1H5Pcreate_1class_1nocb
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "_H5Pcreate_class_nocb: class name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "_H5Pcreate_class_nocb: class name not pinned");
 
     if ((class_id = H5Pcreate_class((hid_t)parent_class, cstr,  NULL, NULL, NULL, NULL, NULL, NULL)) < 0)
@@ -239,6 +245,9 @@ Java_hdf_hdf5lib_H5_H5Pregister2
     get_callback = prp_get;
     delete_callback = prp_delete;
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pregister2: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pregister2: property name not pinned");
 
     PIN_BYTE_ARRAY(ENVONLY, def_value, propValBuf, &isCopy, "H5Pregister2: default property value buffer not pinned");
@@ -271,6 +280,9 @@ Java_hdf_hdf5lib_H5_H5Pregister2_1nocb
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pregister2_nocb: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pregister2_nocb: property name not pinned");
 
     PIN_BYTE_ARRAY(ENVONLY, def_value, propValBuf, &isCopy, "H5Pregister2_nocb: default property value buffer not pinned");
@@ -310,6 +322,9 @@ Java_hdf_hdf5lib_H5_H5Pinsert2
     get_callback = prp_get;
     delete_callback = prp_delete;
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pinsert2: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pinsert2: property name not pinned");
 
     PIN_BYTE_ARRAY(ENVONLY, def_value, propValBuf, &isCopy, "H5Pinsert2: property value buffer not pinned");
@@ -342,6 +357,9 @@ Java_hdf_hdf5lib_H5_H5Pinsert2_1nocb
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pinsert2_nocb: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pinsert2_nocb: property name not pinned");
 
     PIN_BYTE_ARRAY(ENVONLY, def_value, propValBuf, &isCopy, "H5Pinsert2_nocb: property value buffer not pinned");
@@ -370,6 +388,9 @@ Java_hdf_hdf5lib_H5_H5Pset
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pset: property name not pinned");
 
     if ((retVal = H5Pset((hid_t)plid, cstr, &val)) < 0)
@@ -396,6 +417,9 @@ Java_hdf_hdf5lib_H5_H5Pexist
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pexist: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pexist: property name not pinned");
 
     if ((bval = H5Pexist((hid_t)plid, cstr)) < 0)
@@ -425,6 +449,9 @@ Java_hdf_hdf5lib_H5_H5Pget_1size
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pget_size: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pget_size: property name not pinned");
 
     if ((status = H5Pget_size((hid_t)plid, cstr, &size)) < 0)
@@ -541,6 +568,9 @@ Java_hdf_hdf5lib_H5_H5Pget
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pget: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pget: property name not pinned");
 
     if ((status = H5Pget((hid_t)plid, cstr, &val)) < 0)
@@ -629,6 +659,9 @@ Java_hdf_hdf5lib_H5_H5Pcopy_1prop
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pcopy_prop: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Pcopy_prop: property name not pinned");
 
     if ((retVal = H5Pcopy_prop((hid_t)dst_plid, (hid_t)src_plid, cstr)) < 0)
@@ -655,6 +688,9 @@ Java_hdf_hdf5lib_H5_H5Premove
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Premove: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Premove: property name not pinned");
 
     if ((retVal = H5Premove((hid_t)plid, cstr)) < 0)
@@ -681,6 +717,9 @@ Java_hdf_hdf5lib_H5_H5Punregister
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Punregister: property name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, cstr, NULL, "H5Punregister: property name not pinned");
 
     if ((retVal = H5Punregister((hid_t)plid, cstr)) < 0)
diff --git a/java/src/jni/h5pLAPLImp.c b/java/src/jni/h5pLAPLImp.c
index c4502d5..f2cb80a 100644
--- a/java/src/jni/h5pLAPLImp.c
+++ b/java/src/jni/h5pLAPLImp.c
@@ -96,6 +96,9 @@ Java_hdf_hdf5lib_H5_H5Pset_1elink_1prefix
 
     UNUSED(clss);
 
+    if (NULL == prefix)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Pset_elink_prefix: prefix is NULL");
+
     PIN_JAVA_STRING(ENVONLY, prefix, linkPrefix, NULL, "H5Pset_elink_prefix: link prefix not pinned");
 
     if ((retVal = H5Pset_elink_prefix((hid_t)lapl_id, linkPrefix)) < 0)
diff --git a/java/src/jni/h5plImp.c b/java/src/jni/h5plImp.c
index 4e096f1..90d78fe 100644
--- a/java/src/jni/h5plImp.c
+++ b/java/src/jni/h5plImp.c
@@ -83,6 +83,9 @@ Java_hdf_hdf5lib_H5_H5PLappend
 
     UNUSED(clss);
 
+    if (NULL == plugin_path)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5PLappend: new path is NULL");
+
     PIN_JAVA_STRING(ENVONLY, plugin_path, newPath, NULL, "H5PLappend: new path not pinned");
 
     if ((retVal = H5PLappend(newPath)) < 0)
@@ -106,6 +109,9 @@ Java_hdf_hdf5lib_H5_H5PLprepend
 
     UNUSED(clss);
 
+    if (NULL == plugin_path)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5PLprepend: new path is NULL");
+
     PIN_JAVA_STRING(ENVONLY, plugin_path, newPath, NULL, "H5PLprepend: new path not pinned");
 
     if ((retVal = H5PLprepend(newPath)) < 0)
@@ -130,6 +136,9 @@ Java_hdf_hdf5lib_H5_H5PLreplace
 
     UNUSED(clss);
 
+    if (NULL == plugin_path)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5PLreplace: new path is NULL");
+
     if (index < 0)
         H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5PLreplace: index < 0");
 
@@ -157,6 +166,9 @@ Java_hdf_hdf5lib_H5_H5PLinsert
 
     UNUSED(clss);
 
+    if (NULL == plugin_path)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5PLinsert: new path is NULL");
+
     if (index < 0)
         H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5PLinsert: index < 0");
 
diff --git a/java/src/jni/h5rImp.c b/java/src/jni/h5rImp.c
index 9278113..83e2216 100644
--- a/java/src/jni/h5rImp.c
+++ b/java/src/jni/h5rImp.c
@@ -50,6 +50,8 @@ Java_hdf_hdf5lib_H5_H5Rcreate
 
     if (NULL == ref)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Rcreate: reference is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Rcreate: name is NULL");
 
     if ((refBufLen = ENVPTR->GetArrayLength(ENVONLY, ref)) < 0) {
         CHECK_JNI_EXCEPTION(ENVONLY, JNI_TRUE);
diff --git a/java/src/jni/h5sImp.c b/java/src/jni/h5sImp.c
index 67ea59d..a91dab2 100644
--- a/java/src/jni/h5sImp.c
+++ b/java/src/jni/h5sImp.c
@@ -510,7 +510,7 @@ Java_hdf_hdf5lib_H5_H5Sget_1simple_1extent_1type
     UNUSED(clss);
 
     if (space_id < 0)
-        H5_LIBRARY_ERROR(ENVONLY);
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Sget_simple_extent_type: space_id < 0");
 
     if (H5S_NO_CLASS == (retVal = H5Sget_simple_extent_type(space_id)))
         H5_LIBRARY_ERROR(ENVONLY);
diff --git a/java/src/jni/h5tImp.c b/java/src/jni/h5tImp.c
index 08ddf85..313ca8b 100644
--- a/java/src/jni/h5tImp.c
+++ b/java/src/jni/h5tImp.c
@@ -48,6 +48,9 @@ Java_hdf_hdf5lib_H5__1H5Topen2
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Topen2: datatype name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, datatypeName, NULL, "H5Topen2: datatype name not pinned");
 
     if ((status = H5Topen2((hid_t)loc_id, datatypeName, (hid_t)access_plist)) < 0)
@@ -855,7 +858,10 @@ Java_hdf_hdf5lib_H5_H5Tget_1member_1index
 
     UNUSED(clss);
 
-    PIN_JAVA_STRING(ENVONLY, field_name, datatypeName, NULL, "H5Tget_member_index: datatype name not pinned");
+    if (NULL == field_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tget_member_index: field name is NULL");
+
+    PIN_JAVA_STRING(ENVONLY, field_name, datatypeName, NULL, "H5Tget_member_index: field name not pinned");
 
     if ((index = H5Tget_member_index((hid_t)type_id, datatypeName)) < 0)
         H5_LIBRARY_ERROR(ENVONLY);
@@ -937,6 +943,9 @@ Java_hdf_hdf5lib_H5_H5Tinsert
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tinsert: datatype name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, datatypeName, NULL, "H5Tinsert: datatype name not pinned");
 
     if ((status = H5Tinsert((hid_t)type_id, datatypeName, (size_t)off, field_id)) < 0)
@@ -1023,6 +1032,9 @@ Java_hdf_hdf5lib_H5_H5Tset_1tag
 
     UNUSED(clss);
 
+    if (NULL == tag)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tset_tag: tag is NULL");
+
     PIN_JAVA_STRING(ENVONLY, tag, tagBuf, NULL, "H5Tset_tag: tag buffer not pinned");
 
     if ((status = H5Tset_tag((hid_t)type, tagBuf)) < 0)
@@ -1119,11 +1131,13 @@ Java_hdf_hdf5lib_H5_H5Tenum_1insert_1int
     UNUSED(clss);
 
     if (NULL == value)
-        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_insert: value is NULL");
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_insert_int: value is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_insert_int: member name is NULL");
 
-    PIN_JAVA_STRING(ENVONLY, name, memberName, NULL, "H5Tenum_insert: member name not pinned");
+    PIN_JAVA_STRING(ENVONLY, name, memberName, NULL, "H5Tenum_insert_int: member name not pinned");
 
-    PIN_INT_ARRAY(ENVONLY, value, intBuf, &isCopy, "H5Tenum_insert: int buffer not pinned");
+    PIN_INT_ARRAY(ENVONLY, value, intBuf, &isCopy, "H5Tenum_insert_int: int buffer not pinned");
 
     if ((status = H5Tenum_insert((hid_t)type_id, memberName, intBuf)) < 0)
         H5_LIBRARY_ERROR(ENVONLY);
@@ -1155,6 +1169,8 @@ Java_hdf_hdf5lib_H5_H5Tenum_1insert
 
     if (NULL == value)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_insert: value is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_insert: member name is NULL");
 
     PIN_JAVA_STRING(ENVONLY, name, memberName, NULL, "H5Tenum_insert: member name not pinned");
 
@@ -1234,10 +1250,10 @@ Java_hdf_hdf5lib_H5_H5Tenum_1nameof
 
     UNUSED(clss);
 
-    if (NULL == value)
-        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_nameof: value is NULL");
     if (size <= 0)
         H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Tenum_nameof: name size < 0");
+    if (NULL == value)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_nameof: value is NULL");
 
     if (NULL == (nameP = (char *) HDmalloc(sizeof(char) * (size_t)size)))
         H5_JNI_FATAL_ERROR(ENVONLY, "H5Tenum_nameof: failed to allocate name buffer");
@@ -1278,6 +1294,8 @@ Java_hdf_hdf5lib_H5_H5Tenum_1valueof_1int
 
     if (NULL == value)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_valueof_int: value is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_valueof_int: enum value name is NULL");
 
     PIN_JAVA_STRING(ENVONLY, name, enumValue, NULL, "H5Tenum_valueof_int: enum value not pinned");
 
@@ -1313,6 +1331,8 @@ Java_hdf_hdf5lib_H5_H5Tenum_1valueof
 
     if (NULL == value)
         H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_valueof: value is NULL");
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tenum_valueof: enum value name is NULL");
 
     PIN_JAVA_STRING(ENVONLY, name, enumValue, NULL, "H5Tenum_valueof: enum value not pinned");
 
@@ -1533,6 +1553,9 @@ Java_hdf_hdf5lib_H5_H5Tcommit
 
     UNUSED(clss);
 
+    if (NULL == name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tcommit: datatype name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, name, datatypeName, NULL, "H5Tcommit: datatype name not pinned");
 
     if ((status = H5Tcommit2((hid_t)loc_id, datatypeName, (hid_t)type, (hid_t)link_plist_id, (hid_t)create_plist_id, (hid_t)access_plist_id)) < 0)
@@ -1561,10 +1584,10 @@ Java_hdf_hdf5lib_H5__1H5Tarray_1create2
 
     UNUSED(clss);
 
-    if (NULL == dims)
-        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tarray_create: dims is NULL");
     if (rank <= 0)
         H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5Tarray_create: rank is < 1");
+    if (NULL == dims)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5Tarray_create: dims is NULL");
 
     PIN_LONG_ARRAY(ENVONLY, dims, dimsP, &isCopy, "H5Tarray_create: dimsP not pinned");
 
diff --git a/java/src/jni/h5util.c b/java/src/jni/h5util.c
index 4208ce1..fce969e 100644
--- a/java/src/jni/h5util.c
+++ b/java/src/jni/h5util.c
@@ -232,7 +232,7 @@ h5str_convert
                     HDmemcpy(cptr, &tmp_double, sizeof(double));
                     break;
                 }
-#if H5_SIZEOF_LONG_DOUBLE != 0
+#if H5_SIZEOF_LONG_DOUBLE != 0 && H5_SIZEOF_LONG_DOUBLE != H5_SIZEOF_DOUBLE
                 case sizeof(long double):
                 {
                     long double tmp_ldouble = 0.0;
@@ -259,6 +259,8 @@ h5str_convert
 
             if (len > 0) {
                 HDstrncpy(cptr, this_str, typeSize);
+                cptr[typeSize - 1] = '\0';
+
                 retVal = typeSize;
             }
             else {
@@ -329,6 +331,7 @@ h5str_convert
                     break;
                 }
 
+#if H5_SIZEOF_LONG != H5_SIZEOF_INT
                 case sizeof(long):
                 {
                     unsigned long tmp_ulong = 0;
@@ -345,7 +348,7 @@ h5str_convert
 
                     break;
                 }
-
+#endif
 #if H5_SIZEOF_LONG_LONG != H5_SIZEOF_LONG
                 case sizeof(long long):
                 {
@@ -444,14 +447,14 @@ h5str_convert
                     value = &tmp_ushort;
                     break;
                 }
-
+#if H5_SIZEOF_LONG != H5_SIZEOF_INT
                 case sizeof(long):
                 {
                     unsigned long tmp_ulong = 0;
                     value = &tmp_ulong;
                     break;
                 }
-
+#endif
 #if H5_SIZEOF_LONG_LONG != H5_SIZEOF_LONG
                 case sizeof(long long):
                 {
@@ -694,7 +697,7 @@ h5str_sprintf
 
                     break;
                 }
-#if H5_SIZEOF_LONG_DOUBLE != 0
+#if H5_SIZEOF_LONG_DOUBLE != 0 && H5_SIZEOF_LONG_DOUBLE != H5_SIZEOF_DOUBLE
                 case sizeof(long double):
                 {
                     long double tmp_ldouble = 0.0;
@@ -750,6 +753,7 @@ h5str_sprintf
                         H5_JNI_FATAL_ERROR(ENVONLY, "h5str_sprintf: failed to allocate string buffer");
 
                     HDstrncpy(this_str, tmp_str, typeSize);
+                    this_str[typeSize] = '\0';
                 }
             }
 
@@ -844,7 +848,7 @@ h5str_sprintf
 
                     break;
                 }
-
+#if H5_SIZEOF_LONG != H5_SIZEOF_INT
                 case sizeof(long):
                 {
                     unsigned long tmp_ulong = 0;
@@ -871,7 +875,7 @@ h5str_sprintf
 
                     break;
                 }
-
+#endif
 #if H5_SIZEOF_LONG_LONG != H5_SIZEOF_LONG
                 case sizeof(long long):
                 {
diff --git a/java/src/jni/h5vlImp.c b/java/src/jni/h5vlImp.c
index c816abf..92e456e 100644
--- a/java/src/jni/h5vlImp.c
+++ b/java/src/jni/h5vlImp.c
@@ -41,6 +41,9 @@ Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1name
 
     UNUSED(clss);
 
+    if (NULL == connector_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5VLregister_connector_by_name: VOL connector name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, connector_name, volName, NULL, "H5VLregister_connector_by_name: VOL connector name not pinned");
 
     if ((status = H5VLregister_connector_by_name(volName, (hid_t)vipl_id)) < 0)
@@ -87,6 +90,9 @@ Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered
 
     UNUSED(clss);
 
+    if (NULL == connector_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5VLis_connector_registered: VOL connector name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, connector_name, volName, NULL, "H5VLis_connector_registered: VOL connector name not pinned");
 
     if ((bval = H5VLis_connector_registered(volName)) < 0)
@@ -115,6 +121,9 @@ Java_hdf_hdf5lib_H5_H5VLget_1connector_1id
 
     UNUSED(clss);
 
+    if (NULL == connector_name)
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5VLget_connector_id: VOL connector name is NULL");
+
     PIN_JAVA_STRING(ENVONLY, connector_name, volName, NULL, "H5VLget_connector_id: VOL connector name not pinned");
 
     if ((status = H5VLget_connector_id(volName)) < 0)
diff --git a/java/test/TestH5Edefault.java b/java/test/TestH5Edefault.java
index 591793f..ee2850b 100644
--- a/java/test/TestH5Edefault.java
+++ b/java/test/TestH5Edefault.java
@@ -243,7 +243,7 @@ public class TestH5Edefault {
         H5.H5Eget_class_name(-1);
     }
 
-    @Test(expected = IllegalArgumentException.class)
+    @Test(expected = HDF5LibraryException.class)
     public void testH5Eget_class_name_invalid_classname() throws Throwable {
         H5.H5Eget_class_name(HDF5Constants.H5E_DEFAULT);
     }
diff --git a/java/test/TestH5Oparams.java b/java/test/TestH5Oparams.java
index 8b3c673..d340ee7 100644
--- a/java/test/TestH5Oparams.java
+++ b/java/test/TestH5Oparams.java
@@ -124,7 +124,7 @@ public class TestH5Oparams {
         H5.H5Oset_comment(-1, "Bogus");
     }
 
-    @Test(expected = IllegalArgumentException.class)
+    @Test(expected = HDF5LibraryException.class)
     public void testH5Oget_comment_invalid() throws Throwable {
         H5.H5Oget_comment(-1);
     }
@@ -139,7 +139,7 @@ public class TestH5Oparams {
         H5.H5Oset_comment_by_name(-1, null, null, -1);
     }
 
-    @Test(expected = IllegalArgumentException.class)
+    @Test(expected = HDF5LibraryException.class)
     public void testH5Oget_comment_by_name_invalid() throws Throwable {
         H5.H5Oget_comment_by_name(-1, "Bogus", -1);
     }
diff --git a/java/test/TestH5Sbasic.java b/java/test/TestH5Sbasic.java
index 3007495..2173647 100644
--- a/java/test/TestH5Sbasic.java
+++ b/java/test/TestH5Sbasic.java
@@ -49,7 +49,7 @@ public class TestH5Sbasic {
         H5.H5Screate(-1);
     }
 
-    @Test(expected = HDF5LibraryException.class)
+    @Test(expected = IllegalArgumentException.class)
     public void testH5Sget_simple_extent_type_invalid() throws Throwable {
         H5.H5Sget_simple_extent_type(-1);
     }