the main info from the java exception(s) is this: Caused by: java.net.UnknownHostException: testServer
Which actually means, you are trying to reach server 'testServer' which is not reachable or/and the name cannot be resolved.
So to fix this, you just need to add one entry to your 'hosts' file with correspond alias and ip. Then try re-connect (before trying jdbc ensure, you can ping, tracert and telnet your testServer on correspond ip/port).
This will work with direct network connection to you 'testServer'. If there is proxy/firewall between you and server, you possibly need to ask your network admin for some help.
but now there is another exception: java.io.IOException: Incomplete LAN message
what change do i have to do to connect correctly? please.