Different types of Merge seems no difference

I'm using Toplink 9.0.4.5
From the API doc and some previous posts: Create New Object with relationship with an existing object
I understand that shallowMerge will "only merges direct attributes, and does not cascade or merge relationships"
I some tests with the following Object Model:
objA --- (M:M, non privately owned) ---> objB --- (M:M, privately owned) ---> objC
No Indirection is set for the mappings.
I have also defined test case as follows:
objA = session.readById();
objC = objA.getObjB().getObjC();
objC.setSomeThing(NewString);
uow.shallowMerge(objA);
I expect that the change on objC will not be wrtten into DB... However, it did updated objC and persist the change to DB...
I have tried with merge(), mergeWithReferece() and deepMerge() and all of them generate updates to DB ...
Could anyone explain why they have the same behaviour?

The merge() APIs are for merging detached objects, i.e. objects that have be serialized. Where does your objA come from, and has it been serialized? If objA was read through the unit of work, then merging it will have no effect and the changes will have already been detected.

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