Hello,

After finding out that Karaf 4.2.1 includes Eclipselink version with PostgreSQL 
Bug Fix (https://bugs.eclipse.org/bugs/show_bug.cgi?id=522408) I've tested it 
with my code.

But another library has backfired, and I feel helpless about finding out what 
is going on.

I'm using JAXB to deserialize XML. I have 2 bundles, which have effectively the 
same code for deserializing XML from the same schema (some configuration data). 
In one of the bundles, everything works fine, in another one I get the 
exception:

JAXBContext.newInstance(targetClass):

Caused by: java.lang.ClassCastException: com.example.MyType$JaxbAccessorF_value 
cannot be cast to com.sun.xml.internal.bind.v2.runtime.reflect.Accessor
                at 
com.sun.xml.internal.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.instanciate(OptimizedAccessorFactory.java:190)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(OptimizedAccessorFactory.java:179)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.reflect.Accessor$FieldReflection.optimize(Accessor.java:271)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.<init>(TransducedAccessor.java:220)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor.get(TransducedAccessor.java:160)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.model.impl.RuntimeClassInfoImpl.calcTransducer(RuntimeClassInfoImpl.java:230)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.model.impl.RuntimeClassInfoImpl.getTransducer(RuntimeClassInfoImpl.java:204)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.model.impl.RuntimeClassInfoImpl.link(RuntimeClassInfoImpl.java:181)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.link(ModelBuilder.java:439)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.link(RuntimeModelBuilder.java:118)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:443)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:277)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:124)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1123)
 ~[?:?]
                at 
com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:147)
 ~[?:?]
                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[?:?]
                at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
~[?:?]
                at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:?]
                at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
                at 
javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:247) ~[?:?]
                at 
javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:234) ~[?:?]
                at javax.xml.bind.ContextFinder.find(ContextFinder.java:462) 
~[?:?]
                at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:641) 
~[?:?]
                at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:584) 
~[?:?]

I don't see any substantial difference between those 2 bundles. They have other 
config files, but the same code parsing them. They use similar package imports 
etc.

However, one of them always starts, the other one not.

How to start debugging that issue? Have you experienced similar behavior or 
have hints, what can cause them?

The previous version, in that everything was working stable, was Karaf 4.1.3

Best regards,
Lukasz Lech

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