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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DBCP-100) [dbcp] NullPointerException retrieving connection from the pool
Date Mon, 10 Jul 2006 05:27:31 GMT
     [ http://issues.apache.org/jira/browse/DBCP-100?page=all ]

Phil Steitz updated DBCP-100:
-----------------------------

    Bugzilla Id:   (was: 35825)
    Fix Version: 1.2.2

> [dbcp] NullPointerException retrieving connection from the pool
> ---------------------------------------------------------------
>
>          Key: DBCP-100
>          URL: http://issues.apache.org/jira/browse/DBCP-100
>      Project: Commons Dbcp
>         Type: Bug

>  Environment: Operating System: Windows XP
> Platform: Other
>     Reporter: Fedor Karpelevitch
>      Fix For: 1.2.2

>
> under some load we start getting this exception when retrieving connection from
> pool:
> org.apache.commons.dbcp.SQLNestedException: Could not retrieve connection info
> from pool
>         at
> org.apache.commons.dbcp.datasources.SharedPoolDataSource.getPooledConnectionAndInfo(SharedPoolDataSource.java:169)
>         at
> org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:631)
>         at
> org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:615)
>         at org.apache.torque.TorqueInstance.getConnection(TorqueInstance.java:705)
>         ... 34 more
> Caused by: java.lang.NullPointerException
>         at
> org.apache.commons.collections.SequencedHashMap.insertEntry(SequencedHashMap.java:226)
>         at
> org.apache.commons.collections.SequencedHashMap.put(SequencedHashMap.java:451)
>         at org.apache.commons.collections.LRUMap.put(LRUMap.java:125)
>         at
> org.apache.commons.dbcp.datasources.SharedPoolDataSource.getUserPassKey(SharedPoolDataSource.java:179)
>         at
> org.apache.commons.dbcp.datasources.SharedPoolDataSource.getPooledConnectionAndInfo(SharedPoolDataSource.java:165)
>         ... 37 more
> this is apparently caused by improper syncronization:
> SharedPoolDataSource.getPooledConnectionAndInfo() is synchronized _instance_
> method, but it accesses SharedPoolDataSource.userKeys which is a _static_
> variable, so if you have more than one instance of SharedPoolDataSource (as we
> do) access to the map would not be properly synchronized. So either map should
> be made instance variable, or the method should be synchronized on the class,
> not instance.

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