There are failures in EJB3 project testsuite for EAP5
https://svn.jboss.org/repos/jbossas/projects/ejb3/trunk/
when it's running on IBM JDK.

Tests failing on IBM JDK7, EAP 5.2.0.ER2:
These tests seem to be already fixed and don't fail with 5.2.0.ER6

org.jboss.ejb3.test.ejbthree973.unit.AnonymousCallerPrincipalTestCase.testSpy
org.jboss.ejb3.test.exception.unit.ExceptionTestCase.testException
org.jboss.ejb3.test.jbas4489.unit.BMTCleanUpUnitTestCase.testIncomplete
org.jboss.ejb3.test.regression.scopedclassloader.unit.ScopeUnitTestCase.testScopedClassLoaders
org.jboss.ejb3.test.stateful.unit.RemoteUnitTestCase.testStackTrace
org.jboss.ejb3.test.stateless.unit.StatelessTestCase.testUnsecureToSecureWithoutCredentials
org.jboss.ejb3.test.txexceptions.unit.TxExceptionsTestCase.testRollbackErrorInCallerTx

Tests failing on IBM JDK6, EAP 5.2.0.ER2:

org.jboss.ejb3.interceptors.test.ejbthree1950.unit.AdvisedBeanTestCase.testContainerInvocation
org.jboss.ejb3.interceptors.test.ejbthree1950.unit.AdvisedBeanTestCase.testContainerInvocation2
org.jboss.ejb3.interceptors.test.ejbthree1950.unit.AdvisedBeanTestCase.testNormalInvocation
org.jboss.ejb3.test.interceptors.basic.unit.BasicTestRunnerWrapper.test2
org.jboss.ejb3.test.interceptors.basic.unit.BasicTestRunnerWrapper.testInstances

Hudson report:
https://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/eap5-ejb3-testsuite/8/testReport/
(other failures which you can see in this report are known and have different JIRAs)