问题描述
我正在尝试使用阻塞模式的调用中介从后端 API 获取响应。场景适用于成功案例，但当我们尝试获取虚拟数据的响应时，后端抛出 404 错误代码，我得到以下错误。
org.apache.axis2.AxisFault: Transport error: 404 Error: Not Found
at org.apache.axis2.transport.http.HTTPSender.handleResponse(HTTPSender.java:326)
at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:196)
at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:77)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:451)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:278)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:430)
at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:225)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:149)
at org.apache.synapse.message.senders.blocking.BlockingMsgSender.sendReceive(BlockingMsgSender.java:293)
at org.apache.synapse.message.senders.blocking.BlockingMsgSender.send(BlockingMsgSender.java:194)
at org.apache.synapse.mediators.builtin.CallMediator.handleBlockingCall(CallMediator.java:125)
at org.apache.synapse.mediators.builtin.CallMediator.mediate(CallMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:210)
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:214)
at org.apache.axis2.transport.jms.JMSMessageReceiver.onMessage(JMSMessageReceiver.java:124)
at org.apache.axis2.transport.jms.ServiceTaskManager$MessageListenerTask.handleMessage(ServiceTaskManager.java:634)
at org.apache.axis2.transport.jms.ServiceTaskManager$MessageListenerTask.run(ServiceTaskManager.java:515)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
TID: [-1234] [jms-Worker-1] [] [2021-05-17 15:34:31,481] ERROR {org.apache.axis2.transport.jms.JMSMessageReceiver} - UnkNown error processing message
java.lang.RuntimeException: org.apache.synapse.SynapseException: Error while performing the call operation
at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:108)
at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:239)
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:214)
at org.apache.axis2.transport.jms.JMSMessageReceiver.onMessage(JMSMessageReceiver.java:124)
at org.apache.axis2.transport.jms.ServiceTaskManager$MessageListenerTask.handleMessage(ServiceTaskManager.java:634)
at org.apache.axis2.transport.jms.ServiceTaskManager$MessageListenerTask.run(ServiceTaskManager.java:515)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.synapse.SynapseException: Error while performing the call operation
at org.apache.synapse.mediators.builtin.CallMediator.handleFault(CallMediator.java:325)
at org.apache.synapse.mediators.builtin.CallMediator.handleBlockingCall(CallMediator.java:131)
at org.apache.synapse.mediators.builtin.CallMediator.mediate(CallMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.config.xml.AnonymousListMediator.mediate(AnonymousListMediator.java:37)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:203)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.config.xml.AnonymousListMediator.mediate(AnonymousListMediator.java:37)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:203)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.config.xml.AnonymousListMediator.mediate(AnonymousListMediator.java:37)
at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:203)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:214)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.mediators.MediatorFaultHandler.onFault(MediatorFaultHandler.java:93)
at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:101)
... 11 more
Caused by: java.lang.NullPointerException
我正在调用的端点：
<call blocking="true">
<endpoint key="conf:/endpoint/ep123"/>
</call>
如何处理 404 错误。基于错误代码，我有逻辑要实现。但是这里的流程停止了。
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。
小编邮箱:dio#foxmail.com (将#修改为@）