cannot deserialize com.sun.org.apache.xerces.internal.jaxp.datatype.XMLGregorianCalendarImpl any more

[Andreas Kosmala]

Hello Jörg,

(first thanks for maintaining this helpful project!)
Very surprising problem: deserialization of XMLGregorianCalendarImpl works with (corretto) jdk 1.8.0_322, but does NOT WORK with jdk 1.8.0_342!
Why? Because in 1.8.0_342 XMLGregorianCalendarImpl contains method readObject(ObjectInputStream) which makes SerializableConverter.canConvert() return true.

But  readObject(ObjectInputStream) is private! So some steps later deserialization leads to "com.thoughtworks.xstream.converters.ConversionException: Cannot deserialize object with new readObject()/writeObject() methods"
When I make SerializableConverter.canConvert() return false (via debugger expression evaluation - old trick ;-)) the (lower prioritized) RefectionConverter is used instead of SerializableConverter (as is the case in jdk 1.8.0_322) and everything works like a charm :-)

Could you add a check in SerializableConverter.canConvert() whether read/writeObject methods are not only existent but also accessible? That should solve the problem.

Thanks in advance and kind Regards

Andreas

[Andreas Kosmala]

Problem was different that I thought first: if fact  XMLGregorianCalendarImpl has changed in 1.8.0_342. Therefor it is serialized differently than it was before. 

So old Strings serialized with versions <342 cannot be deserialized with 342 any more. Strings serialized with 342 can be deserialized successfully.

This change was unexpected to me, but xstream works fine.

[Jörg Schaible]

Hi Andreas,

you might write an own converter for XMLGregorianCalendar that writed the date
as single value in ISO 8601 format. Then you're independent of such internal
changes.

Regards,
Jörg