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Apache Commons seems to be the decent Object Pool implementation out there. Or any other framework that could support the cause

How Can I save its state of the pool during shutdown; may be serialize its objects to a external form json, xml ..? and reload during next startup ?

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    Saving is not part of a Pooling framework's job. The main job is reusing resource/time intensive objects without creating them. If you want this feature however you can write your own implementation. Commented Jun 8, 2014 at 9:31
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    I added a test-case to Yapool (also an Object Pool implementation) which shows resources can be saved/restored. But you are on your own when it comes to persisting and loading these resources (e.g. to XML/json file). Commented Jun 13, 2014 at 14:19
  • @vanOekel wow this is exactly what I was looking for. can you write this as an answer, so I can reward you. Commented Jun 14, 2014 at 4:27

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It is possible to capture objects in a pool when the pool is closed and put these objects back in the pool when a pool is opened with Yapool. I added a test-case to Yapool that shows how this could be done.

Persisting these objects "between pools" is not part of Yapool. But you can, for example, store them in a file and load them before a pool is opened.

Update: added another test-case which shows a more proper implementation and also shows a corner-case.

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