Why does fragmentation occur with the concurrent low pause collector?
The concurrent low pause collector normally does not move objects during a garbage collection. Fragmentation occurs when live objects are interspersed with the free space left as the result of the collection. The exception is when a non-concurrent, full collection occurs. In this latter case the applications is stopped during the collection and the live objects are compacted to one end of the generation and all the free space reside in a single contiguous piece.
