Jackrabbit 2.2.8 Retrieval of JCR:data node from VersionHistory ( not available)

[yacur]

I am trying to retrieved the diff versions for jcr:data node that represented
by the resNode in the code below.  But when going through the versions, the
jcr:data property is not available.  Can someone please inform me why? 

So after this snippet: 
                Node root = s.getRootNode();
                Node timcard = root.addNode("ntfolder" , JcrConstants.NT_FOLDER 
);
                Node fileNode = timcard.addNode("123" , JcrConstants.NT_FILE );
                Node resNode = fileNode.addNode(JcrConstants.JCR_CONTENT,
JcrConstants.NT_RESOURCE);              
                fileNode.addMixin(JcrConstants.MIX_VERSIONABLE);
         
                Binary  binary = new BinaryImpl( is );
                
                resNode.setProperty("jcr:data", "hello" );
                s.save();
                VersionManager vm = s.getWorkspace().getVersionManager();
                for(int i=0; i<3; i++) {
                    vm.checkout("/ntfolder/123");
                    resNode.setProperty("jcr:data", binary );
                    s.save();
                    vm.checkin("/ntfolder/123");
                }
                s.save();      
                VersionHistory history = vm.getVersionHistory("/ntfolder/123"); 
   
                for (VersionIterator it = history.getAllVersions(); 
it.hasNext();)
{
                    Version version = (Version) it.next();
                    System.out.println("getting version " + version.getName());
                         
                                Node n = version.getFrozenNode();
                                PropertyIterator pi = n.getProperties();
                                while ( pi.hasNext() ) {
                                        Property p = pi.nextProperty();
                                        System.out.println( "Prop name " + 
p.getName() );
                                }
                }

the property jcr:data never shows up:

All versions except the base have: 
Prop name jcr:frozenUuid
Prop name jcr:uuid
Prop name jcr:createdBy
Prop name jcr:frozenPrimaryType
Prop name jcr:created
Prop name jcr:frozenMixinTypes
Prop name jcr:primaryType


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