JTA Connection Error

Hi All,

I am using JTA for database insertion in my BLS and it is working fine but some time I am getting the error like below.

"Error invoking Transaction Command action: JTATransactionCommand - An Unexpected error occurred in the User Transaction execute command method.  Message was: while trying to invoke the method java.sql.Connection.prepareStatement(java.lang.String) of an object loaded from local variable `conn`  class: class java.lang.NullPointerException"

Thanks,

ritim