***Edit*** At last, after approximatively one month i can run tomcat 4.1.31.4, sun java 1.5.06 and xwiki on debian instable without a big tomcat crash. But i still got error from java socket the error message is: ** BEGIN NESTED EXCEPTION ** java.security.AccessControlException MESSAGE: access denied (java.net.SocketPermission localhost resolve) I think it's a ".java.policy" file settings error, how can i set this policy with sun java "policytool" Please help me before i get mad.