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https://issues.apache.org/jira/browse/DBCP-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13193029#comment-13193029
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Mark Thomas commented on DBCP-376:
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That the pooling implementation has been completely re-written between 1.x and
2.x yet the problem continues points to a problem in DBCP or the app.
I'll try and take a look at this when I get some cycles but that might not be
for a while. On the plus side, having the test case you provided should make
investigating this a lot easier.
> Thread safety issue
> -------------------
>
> Key: DBCP-376
> URL: https://issues.apache.org/jira/browse/DBCP-376
> Project: Commons Dbcp
> Issue Type: Bug
> Affects Versions: 1.3
> Reporter: Dave Oxley
> Priority: Critical
> Attachments: dbcp_bug.tar.gz
>
>
> Under high load commons-dbcp (or commons-pool) exhibits thread safety issues
> and begins throwing various exceptions. I don't yet know the cause of the
> issue but it looks like a connection maybe handed out to multiple threads
> concurrently. Here's a few examples of the exceptions we are getting:
> {noformat}
> jvm 1 | Caused by: java.sql.SQLException: Attempted to use
> PooledConnection after closed() was called.
> jvm 1 | at
> org.apache.commons.dbcp.cpdsadapter.PooledConnectionImpl.assertOpen(PooledConnectionImpl.java:163)
> jvm 1 | at
> org.apache.commons.dbcp.cpdsadapter.PooledConnectionImpl.getConnection(PooledConnectionImpl.java:174)
> jvm 1 | at
> org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:768)
> jvm 1 | at
> org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:676)
> jvm 1 | at
> uk.co.webessence.kernel.database.DriverAdapterConnectionPool.acquireConnection(DriverAdapterConnectionPool.java:101)
> jvm 1 | ... 94 more
> {noformat}
> {noformat}
> jvm 1 | Caused by: java.sql.SQLException: PooledConnection was reused,
> withoutits previous Connection being closed.
> jvm 1 | at
> org.apache.commons.dbcp.cpdsadapter.PooledConnectionImpl.getConnection(PooledConnectionImpl.java:179)
> jvm 1 | at
> org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:768)
> jvm 1 | at
> org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:676)
> jvm 1 | at
> uk.co.webessence.kernel.database.DriverAdapterConnectionPool.acquireConnection(DriverAdapterConnectionPool.java:101)
> jvm 1 | ... 77 more
> {noformat}
> {noformat}
> jvm 1 | Caused by: java.sql.SQLException: Invalid state, the ResultSet
> object is closed.
> jvm 1 | at
> net.sourceforge.jtds.jdbc.JtdsResultSet.checkOpen(JtdsResultSet.java:299)
> jvm 1 | at
> net.sourceforge.jtds.jdbc.JtdsResultSet.getColumn(JtdsResultSet.java:273)
> jvm 1 | at
> net.sourceforge.jtds.jdbc.JtdsResultSet.getObject(JtdsResultSet.java:840)
> jvm 1 | at
> org.apache.commons.dbcp.DelegatingResultSet.getObject(DelegatingResultSet.java:325)
> jvm 1 | at
> uk.co.webessence.kernel.persistence.Preloader.getDataArray(Preloader.java:428)
> jvm 1 | at
> uk.co.webessence.kernel.persistence.Preloader.processSingleRow(Preloader.java:175)
> jvm 1 | at
> uk.co.webessence.kernel.persistence.PersistenceHandler.processRecordReload(PersistenceHandler.java:471)
> jvm 1 | at
> uk.co.webessence.kernel.persistence.PersistenceHandler$1.doLoad(PersistenceHandler.java:447)
> jvm 1 | ... 71 more
> {noformat}
> {noformat}
> Message: TDS Protocol error: Invalid packet type 0x4
> jvm 1 | Caused by: java.sql.SQLException: TDS Protocol error: Invalid
> packet type 0x4
> jvm 1 | at
> net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2314)
> jvm 1 | at
> net.sourceforge.jtds.jdbc.TdsCore.getNextRow(TdsCore.java:764)
> jvm 1 | at
> net.sourceforge.jtds.jdbc.JtdsResultSet.next(JtdsResultSet.java:593)
> jvm 1 | at
> org.apache.commons.dbcp.DelegatingResultSet.next(DelegatingResultSet.java:207)
> jvm 1 | at
> uk.co.webessence.kernel.persistence.Preloader.loadData(Preloader.java:142)
> jvm 1 | at
> uk.co.webessence.kernel.persistence.PersistenceHandler$3.doLoad(PersistenceHandler.java:592)
> jvm 1 | ... 111 more
> jvm 1 | Caused by: net.sourceforge.jtds.jdbc.ProtocolException: Invalid
> packet type 0x4
> jvm 1 | at
> net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2301)
> jvm 1 | ... 116 more
> {noformat}
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