Add XPath default serializer

[jorgee]

Add XPath default serializer

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[pditommaso]

Any test unit tests that can replicate the issue and validate the patch?

[jorgee]

Any test unit tests that can replicate the issue and validate the patch?

I have tried to reproduce the error. In fact, there is a unit test checking the XPath serialized and deserialized from a byte array that is the one used in the error in SortFileCollector.saveFile function. This test is not failing even without the no-arg constructor.
I think, the issue is more related to how a particular XPath instance has been serialized that forces Kyro to use the no-args constructor when deserializing in this particular case and not in the others. Finding the particular case could take some time, and I think just adding the default constructor should solve the issue. I can continuing looking for this particular case, but I don't know if it is good to invest more time on it.

[pditommaso]

Curious to see the error trace. Is there a link to the issue?

[jorgee]

Curious to see the error trace. Is there a link to the issue?

#5208