ClassCastException on EJB getList between EARs

Issue

• Why does a remote ejb fail with ClassCastException, in a call between ears, one ear gets to see the other ear's class loader? The interface of the class is in a static module. SomeBaseType is declared in a static module known by both EARs.

  interface Bean2Interface{
    List<? extends SomeBaseType>returnAs()
  }
  
  class A extends SomeBaseType{
    ....
  }
  
  Bean2Interface bean2 = lookup.....//does a lookup on the remote interface to EAR2
  List<A> retrievedAs = bean2.retrieveAs(); //this is working
  A a = retrievedAs.get(0); // this gives ClassCastException