Type java.lang.Integer silently changed to int

[hrynek]

In Titan 0.5 property defined as java.lang.Integer is expected to be int:

rexster[groovy]> g.makeKey("test2").dataType(java.lang.Integer.class).make();
==>test2
rexster[groovy]> g.commit()
==>null
rexster[groovy]> x = g.v(5461996204806111236)                                
==>v[5461996204806111236]
rexster[groovy]> x.test2 = 3;
==>An error occurred while processing the script for language [groovy]. All transactions across all graphs in the session have been concluded with failure: java.util.concurrent.ExecutionException: javax.script.ScriptException: javax.script.ScriptException: 
java.lang.IllegalArgumentException: Value [3] is not an instance of the expected data type for property key [test2] and cannot be converted. 
Expected: int, found: class java.lang.Integer

[mbroecheler]

I cannot reproduce that exception in Gremlin on the current titan05 build. Can you try to reproduce?
Thanks

gremlin> g = TitanFactory.open('berkeleyje:/tmp/titan')
==>titangraph[berkeleyje:/tmp/titan]
gremlin> g.makeKey("test2").dataType(java.lang.Integer.class).make();
==>test2
gremlin> g.commit()
==>null
gremlin> x = g.addVertex()
==>v[2]
gremlin> x.test2 = 3
==>3
gremlin> x.getProperty('test2')
==>3
gremlin> g.commit()
==>null
gremlin> g.V.map
WARN  com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx  - Query requires iterating over all vertices [()]. For better performance, use indexes
==>{test2=3}

[ksmets]

Have the same issue when running titan05 build in storm topology in production. It also complains about

java.lang.RuntimeException: java.lang.IllegalArgumentException: Value [1] is not an instance of the expected data type for property key [count] and cannot be converted. Expected: int, found: class java.lang.Integer

[ksmets]

I figured out what is likely causing the issue... it's related to different version of the kryo serialization library. storm-incubating-0.9.2 uses kryo-2.21 while titan05 depends on kryo-2.22.

If you downgrade titan dependency to kryo-2.21, you can reproduce the silent int vs java.lang.Integer error. If you there is version mismatch you get java.lang.RuntimeException: com.esotericsoftware.kryo.KryoException: Encountered unregistered class ID: 10 in storm.

The solution, for me at least, is to upgrade storm's kryo dependency to 2.22.