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Posted to dev@commons.apache.org by bu...@apache.org on 2005/07/22 00:13:15 UTC
DO NOT REPLY [Bug 35825] New: -
NullPoinTerException retrieving connection from the pool
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http://issues.apache.org/bugzilla/show_bug.cgi?id=35825
Summary: NullPoinTerException retrieving connection from the pool
Product: Commons
Version: unspecified
Platform: Other
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Dbcp
AssignedTo: commons-dev@jakarta.apache.org
ReportedBy: fedor.karpelevitch@mscibarra.com
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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