Wolfgang Glas created POOL-336:
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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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