Hello
now i found out where the error is!!! It was an MySQL Problem!
I installed mySQL with apt-get install in Debian unstable. The problem is that mysql only listens to local UNIX-Sockets and not to TCP-Sockets (read the text below) by default.
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It means that your mysql is not listening to a TCP socket, but is only listening on the local Unix-domain socket. In fact, many MySQL admin books recommend this as a "security" solution (i.e. if no one can connect from outside the machine, it has to be, by definition, secure).
But the problem is that the
JDBC driver needs to connect via TCP/IP, even when the client and the server are on the same machine.
Check with your sysadmin whether MySQL is being started with TCP connections disabled, or if you have a firewall that prevents even local connections to port 3306.
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http://www.opencms.com/majordomo/opencms-dev/0111/msg00095.html Unfortunatley i really can't see the connection between the error message and the problem. But today i noticed i got an error with "connection refused" in my log file. I really didn't notice this error message before, maybe i didn't get it till today.
Angela