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's wrong ??? Yikes! I'm not sure. When does the problem occur? When compiling? When running? What OS are you using? What version of Java? This looks like it might be a JVM problem. If nothing else seems to work, perhaps uninstalling your JRE and then reinstalling it will help. What happens when you try a very simple Java program, such as the following?