为什么我在 WLS 中的 JMS 消息桥每 30 秒停止/启动一次

Question

我遇到了一个问题，我的 JMS 消息桥似乎每 30 秒被 WLS 停止和重新启动。

据我所知，网桥实际上工作正常，WLS 控制台将其报告为“活动，正在转发消息”。据我所知，桥两端的两个队列都正常工作。

每 30 秒出现在我的 WLS 日志中的消息如下所示。这六行每次都重复。

####<2011-sep-20 kl 12:48 CEST> <Info> <MessagingBridge> <host> <server> <[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1316515696279> <BEA-200020> <Bridge "NameOfBridge" is stopped.> 
####<2011-sep-20 kl 12:48 CEST> <Info> <MessagingBridge> <host> <server> <[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1316515696279> <BEA-200033> <Bridge "NameOfBridge" is obtaining connections to the two adapters.> 
####<2011-sep-20 kl 12:48 CEST> <Info> <Common> <host> <server> <[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1316515696284> <BEA-000628> <Created "1" resources for pool "eis/jms/WLSConnectionFactoryJNDIXA", out of which "1" are available and "0" are unavailable.> 
####<2011-sep-20 kl 12:48 CEST> <Info> <Common> <host> <server> <[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1316515696340> <BEA-000628> <Created "1" resources for pool "eis/jms/WLSConnectionFactoryJNDIXA", out of which "1" are available and "0" are unavailable.> 
####<2011-sep-20 kl 12:48 CEST> <Info> <MessagingBridge> <host> <server> <[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1316515696340> <BEA-200032> <Bridge "NameOfBridge" is configured to disallow degradation of its quality of service in cases where the configured quality of service is unreachable.> 
####<2011-sep-20 kl 12:48 CEST> <Info> <MessagingBridge> <host> <server> <[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1316515696340> <BEA-200030> <Bridge "NameOfBridge" is configured to work in "Exactly-once" mode, and it is actually working in "Exactly-once" mode.> 

查看配置后，唯一看起来相关的数字是“事务超时”，它设置为30。这意味着网桥直接打开一个事务，然后失败（或者是因为我配置了错误，或者只是因为没有发生任何事情），然后关闭事务/网桥并重新启动它。我没想到会有这种行为，但也许这就是它的工作原理？

我正在使用 WLS 10.3.0.0。

更新：来自config.xml的相关配置：

<messaging-bridge>
  <name>NameOfBridge</name>
  <target>servercluster</target>
  <source-destination>NameOfBridgeLocalDest</source-destination>
  <target-destination>NameOfBridgeRemoteDest</target-destination>
  <selector></selector>
  <quality-of-service>Exactly-once</quality-of-service>
  <started>true</started>
</messaging-bridge>
<jms-bridge-destination>
  <name>NameOfBridgeLocalDest</name>
  <adapter-jndi-name>eis.jms.WLSConnectionFactoryJNDIXA</adapter-jndi-name>
  <classpath></classpath>
  <connection-factory-jndi-name>JmsXA</connection-factory-jndi-name>
  <initial-context-factory>weblogic.jndi.WLInitialContextFactory</initial-context-factory>
  <connection-url></connection-url>
  <destination-jndi-name>queue/NameOfQueue</destination-jndi-name>
  <destination-type>Queue</destination-type>
</jms-bridge-destination>
<jms-bridge-destination>
  <name>NameOfBridgeRemoteDest</name>
  <adapter-jndi-name>eis.jms.WLSConnectionFactoryJNDIXA</adapter-jndi-name>
  <classpath></classpath>
  <connection-factory-jndi-name>ConnectionFactory</connection-factory-jndi-name>
  <initial-context-factory>org.jnp.interfaces.NamingContextFactory</initial-context-factory>
  <connection-url>jnp://server:port</connection-url>
  <destination-jndi-name>queue/NameOfQueue</destination-jndi-name>
  <destination-type>Queue</destination-type>
</jms-bridge-destination>

Answer 1

As per this Oracle support document（需要 Oracle 帐户），这是异步 JMS 网桥的正常行为。

文档中的问题描述为：

使用 WebLogic Server 9.2 及更高版本；在配置了 JMS 并设置了 JMS 消息桥的域中，JMS 消息桥的日志记录显示每 30 秒断开和重新连接到源目标。

从 Oracle 的角度来看，这是正常的预期行为：

这是一种轮询机制，通常在源目标中没有消息并且消息桥处于空闲状态时发生。

由于异步桥接器会出现这种情况，因此阻止它发生的方法是禁用 JMS 消息传递桥接器的“启用异步模式”选项，这将停止轮询。