java.lang.NoClassDefFoundError on AIX with IBM JDK 1.5

This is a bug. http://jira.jboss.com/jira/browse/JBAS-3691

Performance issues in AIX

You may need to add -Djava.net.preferIPv4Stack=true in order to run JBoss faster in AIX servers.

Refer to SuseHints for more details...