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  1. IronJacamar
  2. JBJCA-1310

NPE when validating database connection (and the validation failed) if connection pool statistics is enabled

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    • Workaround Exists
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      Use mcp="org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool"

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      Use mcp="org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool"

      • An xa-datasource connection pool is configured with: statistic-enabled=true, validate-on-match=true
      • When validation failed, after the failure, the following is logged:
      2016-02-10 12:23:12,580 WARN  [org.jboss.jca.core.connectionmanager.pool.strategy.OnePool] (Sched1_Worker-13) IJ000621: Destroying connection that could not be validated: null
      • This appears to come from SemaphoreConcurrentLinkedDequeManagedConnectionPool.java, line 436: 
        log.destroyingConnectionNotValidated(clw.getConnectionListener());
      • So apparently clw.getConnectionListener() is null at this point, causing line 441/442 to throw NPE, if statistics is enabled:
      pool.getInternalStatistics().deltaTotalPoolTime(lastUsed - clw.getConnectionListener().getLastReturnedTime());
      • NPE is caught by the catch clause, and line 456 write the following to the log:
      2016-02-10 12:23:12,580 WARN  [org.jboss.jca.core.connectionmanager.pool.strategy.OnePool] (Sched1_Worker-13) IJ000613: Throwable while trying to match managed connection, destroying connection: null: java.lang.NullPointerException
	at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.getConnection(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:441)
	at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getTransactionNewConnection(AbstractPool.java:708)
	at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:607)
	at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:590)
	at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:429)
	at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:747)
      • However, this catch clause try to do the same thing that cause the NPE in line 461/462 
        pool.getInternalStatistics().deltaTotalPoolTime(lastUsed - clw.getConnectionListener().getLastReturnedTime());
      • And finally this NPE is throw all the way out to the user of the connection

        1. ironjacamar-core-impl.jar
          483 kB
        2. server_orig.log
          48 kB
        3. server_patch.log
          55 kB

              jpederse@redhat.com Jesper Pedersen
              hugh_synergix Hugh Nguyen (Inactive)
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                Created:
                Updated:
                Resolved: