Good morning. I'm having an odd problem when trying to execute my EJB. It's never happened before: 2006-08-02 08:32:09,618 ERROR [org.jboss.ejb.plugins.LogInterceptor] TransactionRolledbackLocalException in method: public abstract java.util.Vector webmine.ont1.oip.ejbs.addressparser.ejbeans.POBoxExtractorSLSLC_Local.extractForeignAddress(java.lang.StringBuffer) throws javax.naming.NamingException, causedBy: javax.ejb.EJBException: Unexpected Error java.lang.LinkageError: loader constraints violated when linking org/apache/oro/text/regex/MatchResult class at webmine.ont1.oip.ejbs.addressparser.ejbeans.POBoxExtractorSLSLC_Bean.extractForeignAddress(POBoxExtractorSLSLC_Bean.java:142) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.invocation.Invocation.performCall(Invocation.java:345) ... I have jakarta-oro-2.0.8.jar included in the webcheck.jar (which is a bunch of classes that work to parse addresses out of supplied text). But the regular expression code is new in the webcheck.jar. I did a search on google, and java.sun.com, and didn't find anything that was specific to this issue. I did find something about maybe 2 different versions of jakarta-oro, but a search on the machine showed all versions are the same. Does anyone have any idea what the issue is? Thank you, Jonathan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3962494#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...