I have checked all logs, mysql server was not restarted, no crash. The error occures after the application is running for several hours. After this error occured the app can furthermore read from the db, but every update results in a new exception ? No idea what i could try anymore ?
[Message sent by forum member 'nero30' (nero30)]
http://forums.java.net/jive/thread.jspa?messageID=219065