如何控制 WSO2 ESB 上的端点警告

Question

我正在尝试使用 WSO2 ESB 4.8.1 处理以下情况。

ActiveMQ 队列 <--- 代理 ----> WSDL 端点（Bizagi）

对于外部情况（例如，外部网络故障），远程端点停止服务并被 ESB 声明为空。当从队列中监听消息时，代理尝试使用发送中介到端点，并显示以下堆栈跟踪。

2017-01-23 11:17:15,135 [-] [http-nio-9443-exec-14]  **WARN HTTPEndpointFactory Could not read the WSDL endpoint http://IP-Host-Hidden/Procesos/webservices/WorkflowEngineSOA.asmx?wsdl
java.net.NoRouteToHostException: No route to host**
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:997)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:851)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1301)
    at org.apache.synapse.config.SynapseConfigUtils.getOMElementFromURL(SynapseConfigUtils.java:312)
    at org.apache.synapse.config.xml.endpoints.WSDLEndpointFactory.createEndpoint(WSDLEndpointFactory.java:132)
    at org.apache.synapse.config.xml.endpoints.EndpointFactory.createEndpointWithName(EndpointFactory.java:143)
    at org.apache.synapse.config.xml.endpoints.EndpointFactory.getEndpointFromElement(EndpointFactory.java:80)
    at org.wso2.carbon.endpoint.ui.endpoints.wsdl.WsdlEndpoint.build(WsdlEndpoint.java:404)
2017-01-23 11:17:16,138 [-] [demo_in_jms-Worker-2] ERROR JMSMessageReceiver Unknown error processing message java.lang.NullPointerException
    at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.isTransportSwitching(Axis2SynapseEnvironment.java:571)
    at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:335)
    at org.apache.synapse.endpoints.AbstractEndpoint.send(AbstractEndpoint.java:333)
    at org.apache.synapse.endpoints.WSDLEndpoint.send(WSDLEndpoint.java:69)
    at org.apache.synapse.endpoints.IndirectEndpoint.send(IndirectEndpoint.java:54)
    at org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:97)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:77)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:47)
    at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:131)
    at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:166)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
    at org.apache.axis2.transport.base.AbstractTransportListener.handleIncomingMessage(AbstractTransportListener.java:328)
    at org.apache.axis2.transport.jms.JMSMessageReceiver.processThoughEngine(JMSMessageReceiver.java:200)
    at org.apache.axis2.transport.jms.JMSMessageReceiver.onMessage(JMSMessageReceiver.java:122)
    at org.apache.axis2.transport.jms.ServiceTaskManager$MessageListenerTask.handleMessage(ServiceTaskManager.java:556)
    at org.apache.axis2.transport.jms.ServiceTaskManager$MessageListenerTask.run(ServiceTaskManager.java:449)
    at org.apache.axis2.transport.base.threads.NativeWorkerPool.run(NativeWorkerPool.java:172)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

检查 Github WSDLEndpointFactory class，不会在中介层上抛出可检查的异常，只是基于 Java 网络库的警告，但这会引发 NPE JMSMessageReceiver，并且需要处理强制错误并且代理采用 "fault sequence" 路径。

非常感谢在序列上应用什么样的解决方案来实现这种情况。

Answer 1

正如您所指出的，如果不从 WSDLEndpointFactory class[1] 中抛出异常，则无法通过更改配置将消息定向到故障序列。

如果您没有任何使用 WSDL 端点的特殊情况，您可以在代理服务配置中使用地址端点而不是 WSDL 端点来解决这个问题。

[1]。 https://github.com/wso2/wso2-synapse/blob/master/modules/core/src/main/java/org/apache/synapse/config/xml/endpoints/WSDLEndpointFactory.java#L156

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