[xstream-user] java.time does not appear to serialize/deserialize properly

[Geoff Groos]

Hey guys,

I’m wondering what you guys think of XStream + the new (java 1.8) java.time 
library.

I’ve started replacing joda.time uses with java.time ones (as encouraged by the 
Joda time guys themselves) and I only noticed when I ran my persistence tests 
that anything causing XStream to touch a java.time.Instant instance would fail.

A simple test to reproduce:

    private static class ClassWithTimestamp{
        public final Instant timestamp = Instant.now();
    }

    @Test
    public void when_serializing_a_timestamp_xstream_should_have_no_trouble(){
        //setup
        XStream vanillaXStream = new XStream();
        ClassWithTimestamp originalInstance = new ClassWithTimestamp();

        //act
        String serialized = vanillaXStream.toXML(originalInstance);
        ClassWithTimestamp deserialized = (ClassWithTimestamp) 
vanillaXStream.fromXML(serialized);

        //assert
        
assertThat(deserialized.timestamp).isEqualTo(originalInstance.timestamp);
    }


Thoughts?

I’m implementing custom converters now, and since java.time is so much more 
interoperable with the ISO 8601 spec than that worse-than-useless 
java.util.Date stuff, I’m thinking I’ll register these as immutable and have 
them serialize and deserialize to nice ISO strings.

I’d be honored if I could push that stuff upstream to you guys!

-Geoff

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