[jira] [Created] (DERBY-6440) Connections opened by ForeignTableVTI never get released

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

Knut Anders Hatlen created DERBY-6440:
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             Summary: Connections opened by ForeignTableVTI never get released
                 Key: DERBY-6440
                 URL: https://issues.apache.org/jira/browse/DERBY-6440
             Project: Derby
          Issue Type: Bug
          Components: Tools
    Affects Versions: 10.11.0.0
            Reporter: Knut Anders Hatlen


I noticed during a run of suites.All that one database instance never got garbage collected, even after it had been shut down. It turned out it could not get garbage collected because it was still referenced from the static HashMap _connections in ForeignTableVTI. Looking closer at ForeignTableVTI, it looks as if it only calls put() and get() on the HashMap, never remove(), so its memory footprint will keep increasing as it is used.

It would be good to have some way (preferably automatic) of releasing the resources held by ForeignTableVTI when they are no longer needed.



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