Upon returning an EJB2.x Proxy to the caller, CCE. There are 2 root errors involved. One is in SLSB Container, upon localHomeCreate:

Caused by: java.lang.ClassCastException
at java.lang.Class.cast(Class.java:2951)
at org.jboss.ejb3.stateless.StatelessContainer.invokeHomeCreate(StatelessContainer.java:631)
at org.jboss.ejb3.session.SessionSpecContainer.invokeHomeMethod(SessionSpecContainer.java:304)
at org.jboss.ejb3.session.SessionSpecContainer.invoke(SessionSpecContainer.java:187)

Behind that is a CCE when the caller gets the requested Proxy:

Caused by: java.lang.ClassCastException: $Proxy169
at $Proxy172.create(Unknown Source)
at blah.TestBean.getTwoLocal(TestBean.java:44)
at blah.TestBeanBase.getInvokedBusinessInterfaceLocalIllegal(TestBeanBase.java:189)