Dynamic Database Connection failing

[Anzar]

Hi Experts,

I am new to cognos (10.2.2) admin and facing a weird issue ie unable to connect to oracle database using jdbc connection from cognos application.

1. There are six users which are connecting to the same datasource eg. user1,user2,user3,user4,user5,user6
2. Able to connect from first 4 users from user1 to user4
3. XQE-DS-0014 error is coming while testing the connection from user5 and user6

Full Error:

XQE-DS-0014 Unable to logon to the data source. An unexpected error from the JDBC driver "oracle.jdbc.driver.OracleDriver" : "java.lang.RuntimeException: java.lang.NullPointerException".

It's amazing the issue isn't coming for other four users.

Can anyone help me resolve this.

Thanks in Advance

Anzar