来自 Jboss 的 IBM MQ 连接泄漏

Connection leak with IBM MQ from Jboss

在我的 JavaEE 应用程序中,我通过以下方式从 IBM MQ 队列读取消息:

 @TransactionAttribute(TransactionAttributeType.REQUIRED)
 public class MyMessageHandler implements MessageListener  {
 @Resource
 private MessageDrivenContext context;

 @Override
 public void onMessage(Message message) {
    try {
        processMessage(message);

    }
    catch (Exception e) {
        context.setRollbackOnly();
    }       
}

应用程序部署在 Jboss EAP 6.4 上,并使用 wmq.jms.rar 适配器(实施版本:7.1.0.0-k000-L111005)。 这是来自 ejb-jar.xml:

的激活配置
<message-driven>
    <display-name>MyMessageHandler</display-name>
    <ejb-name>MyMessageHandler</ejb-name>
    <ejb-class>org.example.MyMessageHandler</ejb-class>
    <transaction-type>Container</transaction-type>
    <activation-config>
        <activation-config-property>
            <activation-config-property-name>hostName</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>port</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>channel</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>queueManager</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>transportType</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>username</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>password</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>destinationType</activation-config-property-name>
            <activation-config-property-value>javax.jms.Queue</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>destination</activation-config-property-name>
            <activation-config-property-value>${somejbossproperty}</activation-config-property-value>
        </activation-config-property>
        <activation-config-property>
            <activation-config-property-name>acknowledgeMode</activation-config-property-name>
            <activation-config-property-value>auto-acknowledge</activation-config-property-value>
        </activation-config-property>
    </activation-config>
</message-driven>

当抛出异常时,回滚事务,使用IBM MQ回退机制将消息放入IBM MQ回退队列。但是,我注意到连接数量在增加,但没有释放。 这是我如何监控 IBM MQ 服务器上的连接数:

echo "display conn(*) all" | runmqsc <queue manager name> | grep <the IP of the Jboss server>| wc -l

为什么会发生?

问题似乎是由 wmq.jms.rar-适配器的版本引起的。当我们升级到更新版本 (7.5.0.9-p750-009-180830) 时,连接泄漏停止了。