Random "Protocol Adapter" Error

Hello,

I am working on a java program which connects to database and update some rows periodically.

The program starts 5 threads and each thread use one database connection. So at max only 5 database connection will be open. Also after the job is done the database connection is closed.

Now the problem is I get "Protocol Adapter" error randomly. There is no specific reason for it to appear. It appears is any of the 5 threads randomly. Also some times I dont get the error!!

Can some one explain why this error occurs and how to get rid of this.

I use jre1.4 and Oracle 9.0.2's Classes12.jar to connect to database which is also of 9.0.2 version.

Thanks,

Prasanna.

[718 byte] By [prasanna_ma] at [2007-11-27 9:08:18]