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.
Whether the beans are thread-safe or not depends on how the beans have been implemented. Having said that, singleton beans are more likely to be non-thread-safe while prototype (non-singleton) beans are more likely to be thread-safe. Still, it's up to what your code does inside the methods that counts.