"IJ000608: Destroying returned connection, maximum pool size exceeded" in JBoss EAP

Environment

• Red Hat JBoss Enterprise Application Platform (EAP) 7
• IronJacamar 1.4

Issue

Observing the following WARN message in JBoss server.log

IJ000608: Destroying returned connection, maximum pool size exceeded <connection detail>

Resolution

• The prefiller defect This content is not included.JBEAP-18232 was resolved as part of This content is not included.EAP 7.2 cumulative patch (CP) 7.

• The Pool.fillTo defect This content is not included.JBEAP-18961 was resolved as part of EAP 7.2 cumulative patch (CP) 9.

  • As a workaround, a system property may be used to alter the pool implementation

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

Root Cause

There are two known scenarios where this error might occur due to problems within the pool implementation:

• There is a known defect in the pool prefiller (Content from issues.jboss.org is not included.JBJCA-1399).
• There is a known defect in the Pool.fillTo implementation (Content from issues.jboss.org is not included.JBJCA-1404).

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