An alternate Garbage collector is introduced for Java called G1 Garbage Collector. It’s believed to be the best replacement for the existing CMS (Concurrent Mark Sweep) Garbage Collector.
The advantages are


• Reduces fragmentation to achieve more-consistent long-term operation
• Improved efficiency through compaction on heap first
• Smoother pause time


For more detailed information see
http://www.theserverside.com/news/thread.tss?thread_id=54321

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