Portal 7.0 " Processing HTTP request to servlet [jsp] finished with error."

Hi

I just did a system copy for portal 7.0 from my production to quality system.

The import finished successfully and java instance is up and running

We were earlier using jdk 1.4.2 , but moved to JVM 6.1 during the import of the java stack and now the java application is using JVM 6.1 instead of JDK 1.4.2

I m getting the attached error when i m trying to connect with main page of the portal

Plz let me know why is this happenning?

Thanks and Regards

Tushar