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From "Durchholz, Joachim" <>
Subject RE: [jira] [Commented] (CAY-1622) Generated classes shouldn't produce serialVersionUID compiler warning
Date Tue, 04 Oct 2011 15:39:57 GMT
If the plan is to get the whole serialization stuff right at this time, maybe it's best to
go the extra mile and avoid serializing the Map keys.

Prerequisite 1: You need to know the field names, both on the sending and the receiving end.

Prerequisite 2: You need a way to iterate over all field values, in the same order as the
field names; or you need a way to access the field values given a field name in String form.

If these are given, you can transfer just the values and do not need to transfer the keys.

Win: Halve the amount of data that needs to be transferred. Give or take a few, depending
on circumstances.

Maybe win: If you're taking the format of serialized data into your own hands, it could be
made identical for the ROP and non-ROP case. This would make it easy to record serialized
data in one environment and replay it in another, which might help folks who are setting up
diagnostics and unit tests.

Nonproblem: Now that SerialVersionUID takes care that the field structure and hence the Map
keys are the same on both sides, transferring keys is indeed redundant.

Disclaimer: I know next to nothing about the internals of Cayenne, so this may be much work
than it's worth.

So, just my 2 cents worth here.


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