我使用的是Mule standalone 3.1.0，我有一个带有默认异常策略的流。我的fooImpl类故意抛出一个异常，它的stacktrace被吐到mule stdout上——ExceptionTransformer没有被触发，我也没有收到电子邮件。如果我完全删除default-exception-strategy，则不会有任何变化。
我希望它发送一封电子邮件，并用ExceptionTransformer打印异常。我做错了什么？
<flow name="fooService">
<inbound-endpoint address="http://localhost:63082/foo" exchange-pattern="request-response" />
<cxf:jaxws-service serviceClass="com.example.mule.foo.fooImpl" />
<component class="com.example.mule.foo.fooImpl" />
<all>
<file:outbound-endpoint path="/home/hodor/mule-standalone-3.1.0/old/" outputPattern="foo_#[function:datestamp].xml" />
<stdio:outbound-endpoint system="OUT" exchange-pattern="one-way" connector-ref="stdioConnector" transformer-refs="objectToInputStream"/>
</all>
<default-exception-strategy>
<vm:outbound-endpoint path="generalErrorHandler" exchange-pattern="one-way" />
</default-exception-strategy>
</flow>
<flow name="generalErrorHandler">
<vm:inbound-endpoint path="generalErrorHandler" exchange-pattern="one-way" />
<custom-transformer class="com.example.mule.foo.ExceptionTransformer" />
<all>
<smtp:outbound-endpoint host="${error.smtp.host}" port="${error.smtp.port}" subject="${error.smtp.subject}" to="${error.smtp.to}" cc="${error.smtp.cc}" bcc="${error.smtp.bcc}" from="${error.smtp.sender}" />
</all>
</flow>
进一步，我尝试使用<custom-exception-strategy class="com.arcusys.nkeservice.mule.dynasty.ExceptionTest">而不是default-exception-strategy。然后ExceptionTest在服务启动期间被实例化，但@override handleException从未被调用。
我到stdout的强制异常是这样的：
WARN 2015-02-23 10:59:17,159 [[foo].connector.http.0.receiver.2] org.apache.cxf.phase.PhaseInterceptorChain: Interceptor for {http://foo.com/}FooImplService#{http://foo.com/}getCase has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: Component that caused exception is: org.mule.component.DefaultJavaComponent component for: SimpleFlowConstruct{fooService}. Message payload is of type: Object[]
at org.mule.module.cxf.MuleInvoker.invoke(MuleInvoker.java:85)
at org.mule.module.cxf.MuleJAXWSInvoker.invoke(MuleJAXWSInvoker.java:47)
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:75)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:106)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:247)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:113)
at org.mule.module.cxf.CxfInboundMessageProcessor.sendToDestination(CxfInboundMessageProcessor.java:292)
at org.mule.module.cxf.CxfInboundMessageProcessor.process(CxfInboundMessageProcessor.java:131)
at org.mule.module.cxf.config.FlowConfiguringMessageProcessor.process(FlowConfiguringMessageProcessor.java:50)
at org.mule.processor.AbstractInterceptingMessageProcessor.processNext(AbstractInterceptingMessageProcessor.java:75)
at org.mule.processor.AsyncInterceptingMessageProcessor.process(AsyncInterceptingMessageProcessor.java:103)
at org.mule.processor.chain.DefaultMessageProcessorChain.doProcess(DefaultMessageProcessorChain.java:62)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.processor.AbstractInterceptingMessageProcessor.processNext(AbstractInterceptingMessageProcessor.java:75)
at org.mule.interceptor.AbstractEnvelopeInterceptor.process(AbstractEnvelopeInterceptor.java:55)
at org.mule.processor.AbstractInterceptingMessageProcessor.processNext(AbstractInterceptingMessageProcessor.java:75)
at org.mule.interceptor.AbstractEnvelopeInterceptor.process(AbstractEnvelopeInterceptor.java:55)
at org.mule.processor.AbstractInterceptingMessageProcessor.processNext(AbstractInterceptingMessageProcessor.java:75)
at org.mule.processor.AbstractFilteringMessageProcessor.process(AbstractFilteringMessageProcessor.java:41)
at org.mule.processor.chain.DefaultMessageProcessorChain.doProcess(DefaultMessageProcessorChain.java:62)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.processor.chain.InterceptingChainLifecycleWrapper.doProcess(InterceptingChainLifecycleWrapper.java:60)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.construct.AbstractFlowConstruct$1$1.process(AbstractFlowConstruct.java:107)
at org.mule.processor.chain.DefaultMessageProcessorChain.doProcess(DefaultMessageProcessorChain.java:62)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.processor.AbstractInterceptingMessageProcessor.processNext(AbstractInterceptingMessageProcessor.java:75)
at org.mule.processor.ExceptionHandlingMessageProcessor.process(ExceptionHandlingMessageProcessor.java:25)
at org.mule.processor.chain.DefaultMessageProcessorChain.doProcess(DefaultMessageProcessorChain.java:62)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.processor.chain.InterceptingChainLifecycleWrapper.doProcess(InterceptingChainLifecycleWrapper.java:60)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.processor.chain.DefaultMessageProcessorChain.doProcess(DefaultMessageProcessorChain.java:62)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.processor.chain.InterceptingChainLifecycleWrapper.doProcess(InterceptingChainLifecycleWrapper.java:60)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:188)
at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:161)
at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:148)
at org.mule.transport.http.HttpMessageReceiver$HttpWorker.doRequest(HttpMessageReceiver.java:247)
at org.mule.transport.http.HttpMessageReceiver$HttpWorker.processRequest(HttpMessageReceiver.java:206)
at org.mule.transport.http.HttpMessageReceiver$HttpWorker.run(HttpMessageReceiver.java:164)
at org.mule.work.WorkerContext.run(WorkerContext.java:309)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1061)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:575)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.mule.component.ComponentException: Component that caused exception is: org.mule.component.DefaultJavaComponent component for: SimpleFlowConstruct{fooService}. Message payload is of type: Object[]
at org.mule.component.DefaultComponentLifecycleAdapter.invoke(DefaultComponentLifecycleAdapter.java:359)
at org.mule.component.AbstractJavaComponent.invokeComponentInstance(AbstractJavaComponent.java:89)
at org.mule.component.AbstractJavaComponent.doInvoke(AbstractJavaComponent.java:80)
at org.mule.component.AbstractComponent.invokeInternal(AbstractComponent.java:114)
at org.mule.component.AbstractComponent.access$000(AbstractComponent.java:52)
at org.mule.component.AbstractComponent$1.process(AbstractComponent.java:236)
at org.mule.processor.chain.DefaultMessageProcessorChain.doProcess(DefaultMessageProcessorChain.java:62)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.processor.chain.InterceptingChainLifecycleWrapper.doProcess(InterceptingChainLifecycleWrapper.java:60)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.component.AbstractComponent.process(AbstractComponent.java:147)
at org.mule.processor.chain.DefaultMessageProcessorChain.doProcess(DefaultMessageProcessorChain.java:62)
at org.mule.processor.chain.AbstractMessageProcessorChain.process(AbstractMessageProcessorChain.java:90)
at org.mule.module.cxf.CxfInboundMessageProcessor.processNext(CxfInboundMessageProcessor.java:334)
at org.mule.module.cxf.MuleInvoker.invoke(MuleInvoker.java:80)
... 49 more
Caused by: java.io.IOException: Test IOException
at com.foo.FooImpl.getCase(FooImpl.java:240)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.mule.model.resolvers.AbstractEntryPointResolver.invokeMethod(AbstractEntryPointResolver.java:151)
at org.mule.model.resolvers.MethodHeaderPropertyEntryPointResolver.invoke(MethodHeaderPropertyEntryPointResolver.java:112)
at org.mule.model.resolvers.DefaultEntryPointResolverSet.invoke(DefaultEntryPointResolverSet.java:39)
at org.mule.component.DefaultComponentLifecycleAdapter.invoke(DefaultComponentLifecycleAdapter.java:350)
... 63 more
在Mule 3.1.3之前，CXF组件调用异常策略时存在问题：
http://mule.1045714.n5.nabble.com/mule-scm-mule-22344-branches-mule-3-1-x-modules-cxf-src-test-resources-EE-2273-td4557349.html
EE-2273-http://www.mulesoft.org/documentation/display/current/Mule+ESB+3.1.3+Release+Notes
您必须在流内部使用来捕获异常并执行通知。
<flow name="fooService">
<inbound-endpoint address="http://localhost:63082/foo" exchange-pattern="request-response" />
<cxf:jaxws-service serviceClass="com.example.mule.foo.fooImpl" />
<component class="com.example.mule.foo.fooImpl" />
<all>
<file:outbound-endpoint path="/home/hodor/mule-standalone-3.1.0/old/" outputPattern="foo_#[function:datestamp].xml" />
<stdio:outbound-endpoint system="OUT" exchange-pattern="one-way" connector-ref="stdioConnector" transformer-refs="objectToInputStream"/>
</all>
<catch-exception-strategy>
<vm:outbound-endpoint path="generalErrorHandler" exchange-pattern="one-way" />
</catch-exception-strategy>
</flow>
希望这能有所帮助。
如前所述，您需要使用catch异常策略，默认策略只记录异常。此外，您可以将catch异常策略定义为全局异常策略，而不是使用VM出站端点来访问其他流中的错误处理程序。你可以在这里找到更多关于这一切的信息。
使用以下内容作为流的基于选择的异常策略的一部分<choice-exception-strategy>
<catch-exception-strategy when="#[exception.causedBy(java.lang.Exception)]" doc:name="Catch Exception Strategy">
<vm:outbound-endpoint path="generalErrorHandler" exchange-pattern="one-way" />
</catch-exception-strategy></choice-exception-strategy>