org.jboss.test.jmx.test.EarDeploymentUnitTestCase & org.jboss.test.jmx.test.UnpackedDeploymentUnitTestCase uses
org.jboss.test.jmx.eardeployment.a.ejb.SessionABean which intializes X.VERSION from org.jboss.test.jmx.eardeployment.util.X

The test fails with a problem in initializing this:
Caused by: java.lang.NoClassDefFoundError: org/jboss/test/jmx/eardeployment/util/X
at org.jboss.test.jmx.eardeployment.a.ejb.SessionABean.<clinit>(SessionABean.java:53)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:308)
at java.lang.Class.newInstance(Class.java:261)
at org.jboss.ejb.Container.createBeanClassInstance(Container.java:599)
at org.jboss.ejb.plugins.AbstractInstancePool.get(AbstractInstancePool.java:183)
... 30 more

The test results can be found here:
http://cruisecontrol.jboss.com/cc/artifacts/jboss-4.0-testsuite/20060308010418/results/index.html