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.
I have an EJB scheduled job run at 00:30AM every day, it will read an external file in the system, like /usr/myproject/feed.xml. inside the scheduler, I didn't create any multiple threads.
Question is, when I deploy codes to multiple cluster / instances, do I need to worry about synchronized issue ? is it possible that the feed.xml is accessed by two threads from two instances at the same time ?