mysql connector is not working sometimes to connect to ther MySQL server

[jayanandan t]

hi,
I am using mysql-connector-java-5.0.5-bin.jar to connect to the MySQL server 4.1.22.But very first time or sometimes later im not able to connect to the server through my java appliction.I tried changing connection pool drivers.Nothing seems to be worked.
my application is running on jboss server which uses the MySQL server version4.1.22 and connector is mysql-connector-java-5.0.5-bin.jar.
The error message i got is,
communication link failure.
pipe broken.
java.net.socket exception.
sent last packets 9ms ago.

Coz of these, my appliation could not get able to execute query.
I checked by changing the connector5.1.10 to mysql-connector-java-3.1.0-bin.jar.

The main important thing is that its working locally fine but when i host everything(jboss+mysql+connector) as it is,the problem i told in the above is coming sometimes.

Please help me since we are about to release the project very soon.

Thanks in advance.