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.
The error message tells you that you are sending autorelease message to an object but you didn't create an auto released pool.
Which I think it is strange since this the heart of Cocoa programming and you said you are doing Java programming.
Are you creating Swing, SWT or Cocoa application?