I made a small project which looks like this

• playboss.ear
  • lib
    • commonlib.jar
      • JsonDeserializer.class
    • testlib.jar
      • JsonMessage.class
      • Version.class
    • jackson-1.9.4.jar
  • playboss_ejb.jar
    • MessageTimer.class

JsonMessage has a member private Class<? extends Version> msgVersion = Version.V0.class;

MessageTimer is just a Bean with a timeout which does nothing but deserializes an example String of JsonMessage using JsonDeserializer.

Everything works fine, i.e. the String is converted  to JsonMessage!

Now I add a dependency to my project containing a JAX-RS API and model objects such that lib is extended.

• lib
  • SomeAPI.jar
  • javax.ws.rs-api-2.0.jar

Now when I start the EAP I get the following exception:

Caused by: java.lang.ClassNotFoundException: playground.testlib.Version$V0 from [Module "org.codehaus.jackson.jackson-mapper-asl:main" from local module loader @9e89d68

  at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:213) [jboss-modules.jar:1.3.7.Final-redhat-1]

  at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459) [jboss-modules.jar:1.3.7.Final-redhat-1]

  at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408) [jboss-modules.jar:1.3.7.Final-redhat-1]

  at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389) [jboss-modules.jar:1.3.7.Final-redhat-1]

  at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134) [jboss-modules.jar:1.3.7.Final-redhat-1]

  at java.lang.Class.forName0(Native Method) [rt.jar:1.8.0_66]

  at java.lang.Class.forName(Class.java:264) [rt.jar:1.8.0_66]

  at org.codehaus.jackson.map.deser.std.ClassDeserializer.deserialize(ClassDeserializer.java:42) [jackson-mapper-asl-1.9.9.redhat-4.jar:1.9.9.redhat-4]

I figure that due to https://docs.jboss.org/author/display/AS7/Implicit+module+dependencies+for+deployments the jax-rs module dependency is triggered and jackson gets loaded from modules.

My questions:

1) What is the recommended / best way to get my deserialization working again

2) I would like to understand how object mapping is done with jax-rs if the module classloader does obviously not see my model classes.