update: i found some answers in https://community.jboss.org/message/586896 , http://community.jboss.org/message/363520 and http://community.jboss.org/thread/110175 .
read that i guess i have to limit thread creation or just use StrictMaxPool.
well, i am not sure about pooling threads, but i think thats a JBoss Remoting question, right?