普元 ESB 6.6，通过ESB进行ws穿透后报错：channel must not be null。

问题描述：通过ESB进行ws穿透后报错：

com.primeton.tip.org.springframework.integration.message.MessageHandlingException: error occurred in message handler [com.primeton.esb.core.HeaderRouterHandler@d6f628]

    at com.primeton.esb.core.RouterHandler.handleMessage(RouterHandler.java:50)

    at com.primeton.tip.org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:104)

    at com.primeton.tip.org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:91)

    at com.primeton.tip.org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:44)

    at com.primeton.tip.org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:177)

    at com.primeton.tip.org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:150)

    at com.primeton.tip.org.springframework.integration.channel.MessageChannelTemplate.doSend(MessageChannelTemplate.java:223)

    at com.primeton.tip.org.springframework.integration.channel.MessageChannelTemplate.send(MessageChannelTemplate.java:182)

    at com.primeton.esb.model.outbound.impl.AbstractStandardOutbound.send(AbstractStandardOutbound.java:142)

    at com.primeton.esb.model.outbound.impl.AbstractStandardOutbound$Outbound_RequestHandler.handleMessage(AbstractStandardOutbound.java:247)

    at com.primeton.tip.org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:104)

    at com.primeton.tip.org.springframework.integration.dispatcher.UnicastingDispatcher.access$000(UnicastingDispatcher.java:47)

    at com.primeton.tip.org.springframework.integration.dispatcher.UnicastingDispatcher$1.run(UnicastingDispatcher.java:86)

    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)

    at java.lang.Thread.run(Thread.java:662)

Caused by: java.lang.IllegalArgumentException: channel must not be null

    at com.primeton.tip.org.springframework.util.Assert.notNull(Assert.java:112)

    at com.primeton.tip.org.springframework.integration.channel.MessageChannelTemplate.doSend(MessageChannelTemplate.java:221)

    at com.primeton.tip.org.springframework.integration.channel.MessageChannelTemplate.send(MessageChannelTemplate.java:182)

    at com.primeton.esb.core.RouterHandler.sendMessage(RouterHandler.java:78)

    at com.primeton.esb.core.RouterHandler.handleResult(RouterHandler.java:67)

    at com.primeton.esb.core.RouterHandler.handleMessageInternal(RouterHandler.java:63)

    at com.primeton.esb.core.RouterHandler.handleMessage(RouterHandler.java:45)

    ... 15 more

问题原因：在创建ESB模型后，新建多个endpoint，在删除endpoint的时候未选择删除对应的server下的文件资源，导致多个相同的endpoint同时存在，server在调用的时候无法找到对应的endpoint，从而建立正确的channel，如图：

解决方案：找到对应的ESB server安装目录，找到文件夹esb\studio\server\EOS\_srv\work\user\cgn.esb.common\cgn\esb\common\endpoint；删除下图中的对应的文件以及文件夹，再重新启动server：