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
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:
{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}
{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}
{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}
{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}
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