This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
What comes to my mind is to mark performOperation transaction attribute of SubManager as NOT_SUPPORTED (there are no database operations in that method).
What are your recommendations to avoid this exception? (I have no influence on the external system).
The code is running in Weblogic Server