Is it necessary to initialize all ValueHolderInterface properties?

Hello,
I'm new to Toplink and there are a few point that are still a mistery to me, even though i've read so many articles and forum posts, etc. ValueHolderInterface and Method Accessing are the top examples...
Even though i don't really understand what they are and how they work, i read that usage of both are recommended, so'i'm using.
Now i find myself in front of the challenge of actually making use of them.
First thing is that this one-to-one mapping i have, i'm initializing this property like this:
myObj.setProperty(new ValueHolder(anotherObj));
Ok, this one seems to be alright, although i'm not quite sure it'll work for the application is generating an Exception when i commit();
First the Exception was saying that:
"The mapping for the attribute [someAttr] uses transparent indirection so the attribute...". this is all e.getMessage() is giving me...
Somewhere i read that this because some ValueHolderInterface property is not being initialized. So, once this property is supposed to be null, for now, i'm trying to initialize it with a null object:
myObj.setsomeCollection(new ArrayList());
And i repeated that to all my collections that are supposed to be null by now.
But my question is, do i really need to initialize all these properties like that? Isn't there a way to just ignoring them, like any other regular property i want null?
Thanks you all

Chris,
You said you were not sure what the exception was. Well... me neither.
But i think i found a way to find it:
Mapping: oracle.toplink.mappings.ManyToManyMapping[posCollection]
Descriptor: Descriptor(ferramentaria.Usuarios --> [DatabaseTable(mypackage.USUARIOS)])
     at oracle.toplink.exceptions.DescriptorException.<init>(DescriptorException.java:196)
     at oracle.toplink.exceptions.DescriptorException.indirectContainerInstantiationMismatch(DescriptorException.java:562)
     at oracle.toplink.internal.indirection.TransparentIndirectionPolicy.validateAttributeOfInstantiatedObject(TransparentIndirectionPolicy.java:357)
     at oracle.toplink.mappings.ForeignReferenceMapping.getAttributeValueFromObject(ForeignReferenceMapping.java:303)
     at oracle.toplink.mappings.ForeignReferenceMapping.isAttributeValueInstantiated(ForeignReferenceMapping.java:479)
     at oracle.toplink.mappings.CollectionMapping.mergeChangesIntoObject(CollectionMapping.java:625)
     at oracle.toplink.internal.descriptors.ObjectBuilder.mergeChangesIntoObject(ObjectBuilder.java:1453)
     at oracle.toplink.internal.sessions.MergeManager.mergeChangesOfWorkingCopyIntoOriginal(MergeManager.java:517)
     at oracle.toplink.internal.sessions.MergeManager.mergeChanges(MergeManager.java:174)
     at oracle.toplink.publicinterface.UnitOfWork.mergeChangesIntoParent(UnitOfWork.java:2555)
     at oracle.toplink.publicinterface.UnitOfWork.commitRootUnitOfWork(UnitOfWork.java:960)
     at oracle.toplink.publicinterface.UnitOfWork.commit(UnitOfWork.java:771)
     at ferramentaria.view.Usuarios_insereAction.execute(Usuarios_insereAction.java:73)
     at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
     at oracle.security.jazn.oc4j.JAZNFilter.doFilter(Unknown Source)
     at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:16)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:239)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:645)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:322)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:790)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
     at java.lang.Thread.run(Thread.java:534)
I think this is it...
Thanks again

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Is there a way to convert and object to strings so I can see how it is built?
Whoops, I'd meant to answer this. Sure, you can just loop over the object. For instance, since you were curious about the "properties" member, suppose we wanted to look at the individual members of the properties object of a link.
Just type in the JavaScript console:
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editingState     1986217301
linkXmp     [object LinkMetadata]
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(*:reference is to Javascript: The Good Parts; Awful Parts, a book (well, chapter thereof) well worth reading.))

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