I have the same problem and I don't know how to fix it.
Chek this post
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=83204
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http://www.jboss.com/index.html?module=b
WARN [TreeCache] No transaction manager lookup class has been defined.
Transactions cannot be used
I am also getting this warning but I cannot find any information about this.
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I had the same problem and I changed the form action of
jboss-portal.sar/portal-server.war/login.jsp to
action="j_security_check"
(I just removed the scriplet with the action)
It's working now but I am not an expert, so I don't know why.
myConfig: -- mysql, jboss-4.0.4.GA-Patch1-installer.jar