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From "Wolfgang Glas (JIRA)" <j...@apache.org>
Subject [jira] [Created] (POOL-336) GenericObjectPool's borrowObject lock if create() fails with Error
Date Sat, 30 Dec 2017 20:12:00 GMT
Wolfgang Glas created POOL-336:
----------------------------------

             Summary: GenericObjectPool's borrowObject lock if create() fails with Error
                 Key: POOL-336
                 URL: https://issues.apache.org/jira/browse/POOL-336
             Project: Commons Pool
          Issue Type: Bug
    Affects Versions: 2.5.0, 2.4.3
         Environment: mariadb-connector-j
            Reporter: Wolfgang Glas
             Fix For: 2.5.1


We've spotted exactly the same problem as described in POOL-303 for a pool using mariadb-connector-j-2.1.2
with a pool configured to a size, which exactly reflects the normal quantity of used DB connections.

After weeks of monitoring the situation, we were able to see the same problem as described
in POOL-303. After some more drilldown efforts we concluded, that the problem is triggered,
because mariadb-connector-j throws instances of Throwables derived from {{java.lang.Error}},
which are not instances of {{java.lang.Execption}}.
This leads to a leak of {{makeCount}} in GenericObjectPool.create(), because {{makeCount}}
is only decremented, when an instance of {{java.lang.Exception}} is thrown and not when an
instance of {{java.langError}} is thrown.



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