Index: ompi/mpi/java/java/Datatype.java
===================================================================
--- ompi/mpi/java/java/Datatype.java	(revision 27719)
+++ ompi/mpi/java/java/Datatype.java	(working copy)
@@ -558,8 +558,10 @@
   public int Extent() throws MPIException {
     if(baseType == OBJECT || baseType == UNDEFINED)
       return ub - lb ;
-    else
-      return extent() / baseSize ;  
+    else {
+	/* return extent() / baseSize ;   JMS I think this is wrong */
+	return extent();
+    }
   }

   private native int extent();
@@ -578,8 +580,10 @@
   public int Size() throws MPIException {
     if(baseType == OBJECT || baseType == UNDEFINED)
       return displacements.length;
-    else 
-      return size() / baseSize ;  
+    else {
+	/* return size() / baseSize ;  JMS I think this is wrong */
+	return size();
+    }
   }

   private native int size();
@@ -599,8 +603,10 @@
   public int Lb() throws MPIException {
     if(baseType == OBJECT || baseType == UNDEFINED)
       return lb;
-    else 
-      return lB() / baseSize ;
+    else {
+	/* return lB() / baseSize ;  JMS I think this is wrong */
+	return lB();
+    }
   }

   private native int lB();
@@ -620,8 +626,10 @@
   public int Ub() throws MPIException {
     if(baseType == OBJECT || baseType == UNDEFINED)
       return ub;
-    else 
-      return uB() / baseSize ; 
+    else {
+	/* return uB() / baseSize ; JMS I think this is wrong */
+	return uB() / baseSize ; 
+    }
   }

   private native int uB();
@@ -818,6 +826,27 @@
                         array_of_types) ;
   }

+    /*
+     * JMS add proper documentation here
+     * JMS int != Aint!  This needs to be fixed throughout.
+     */
+    public static Datatype Resized(Datatype oldtype,
+				   int lb,
+				   int extent) throws MPIException {
+	return new Datatype(oldtype, lb, extent);
+    }
+
+    /*
+     * Constructor used by 'Resized'
+     */
+    private Datatype(Datatype oldtype, int lb, int extent) throws MPIException {
+	baseSize = oldtype.baseSize;
+	baseType = oldtype.baseType;
+	GetResized(oldtype, lb, extent);
+    }
+
+    private native void GetResized(Datatype oldtype, int lb, int extent);
+
   protected long handle;
   protected int baseType ;
   protected int baseSize ;  // or private
Index: ompi/mpi/java/c/mpi_Datatype.c
===================================================================
--- ompi/mpi/java/c/mpi_Datatype.c	(revision 27719)
+++ ompi/mpi/java/c/mpi_Datatype.c	(working copy)
@@ -392,3 +392,23 @@

     (*env)->SetLongField(env,jthis, ompi_java.DatatypehandleID, (jlong)type);
 }
+
+/*
+ * Class:     mpi_Datatype
+ * Method:    GetResized
+ * Signature: (III)V  JMS ???
+ */
+JNIEXPORT void JNICALL Java_mpi_Datatype_GetResized(JNIEnv *env, jobject jthis,
+                                                    jobject oldtype,
+                                                    jint lb, jint extent)
+{
+    MPI_Datatype type;
+
+    ompi_java_clearFreeList(env) ;
+
+    MPI_Type_create_resized((MPI_Datatype)((*env)->GetLongField(env,oldtype,ompi_java.DatatypehandleID)),
+                            lb, extent, &type);
+
+    (*env)->SetLongField(env, jthis, ompi_java.DatatypehandleID, (jlong)type);
+}
+
Index: ompi/mpi/java/c/mpijava.exp
===================================================================
--- ompi/mpi/java/c/mpijava.exp	(revision 27719)
+++ ompi/mpi/java/c/mpijava.exp	(working copy)
@@ -45,6 +45,7 @@
 Java_mpi_Datatype_GetHvector
 Java_mpi_Datatype_GetIndexed
 Java_mpi_Datatype_GetHindexed
+Java_mpi_Datatype_GetResized
 Java_mpi_Datatype_GetStruct
 Java_mpi_Datatype_extent
 Java_mpi_Datatype_size