IndicThreads.com is currently running a Java code contest in association with Devsquare. As part of the contest a new question is presented every week. The Java code solution you provide is evaluated on various factors like code correctness, compliance with standards, coding efficiency, and coding productivity – and rated. The best entries win a book every week, music players every month and an iPod for the series. The questions deal with core java / servlets / jsp.
To participate, your web browser is all you require. No additional machine setup is required.
Try it out. Entry is free of charge and is open to Java developers from across the globe.