Mule散射聚集路由器引发异常
我正在探索Mule散点聚集，以并行处理Mule fork和join模式中的流。我的Mule配置如下：Mule散射聚集路由器引发异常,mule,mule-studio,Mule,Mule Studio,我正在探索Mule散点聚集，以并行处理Mule fork和join模式中的流。我的Mule配置如下： <flow name="fork" doc:name="fork"> <http:inbound-endpoint host="localhost" port="8090" path="mainPath" exchange-pattern="request-response" doc:name="HTTP"/> <set-property prop
<flow name="fork" doc:name="fork">
<http:inbound-endpoint host="localhost" port="8090" path="mainPath" exchange-pattern="request-response" doc:name="HTTP"/>
<set-property propertyName="MULE_CORRELATION_GROUP_SIZE" value="2" doc:name="Property"/>
<!-- <all enableCorrelation="IF_NOT_SET" doc:name="All"> -->
<scatter-gather timeout="6000">
<processor-chain>
<async doc:name="Async">
<set-property propertyName="MULE_CORRELATION_SEQUENCE" value="1" doc:name="Property"/>
<flow-ref name="Flow1" doc:name="Flow Reference"/>
</async>
</processor-chain>
<async doc:name="Async">
<set-property propertyName="MULE_CORRELATION_SEQUENCE" value="2" doc:name="Property"/>
<flow-ref name="Flow2" doc:name="Flow Reference"/>
</async>
<!-- </all> -->
</scatter-gather>
<logger message="Main Flow" level="INFO" doc:name="Logger"/>
</flow>
<sub-flow name="Flow1" doc:name="Flow1">
<logger level="INFO" message="Flow1: processing started" doc:name="Logger"/>
<set-payload value="Flow1 Payload" doc:name="Set Payload"/>
<!-- Transformation payload -->
<logger level="INFO" message="Flow1: processing finished" doc:name="Logger"/>
<flow-ref name="Join-Flow" doc:name="Flow Reference"/>
</sub-flow>
<sub-flow name="Flow2" doc:name="Flow2">
<logger level="INFO" message="Flow2: processing started" doc:name="Logger"/>
<set-payload value="Flow2 Payload" doc:name="Set Payload"/>
<scripting:component doc:name="Groovy">
<scripting:script engine="Groovy"><![CDATA[sleep(2000); return message.payload;]]></scripting:script>
</scripting:component>
<!-- Transformation payload -->
<logger level="INFO" message="Flow2: processing finished" doc:name="Logger"/>
<flow-ref name="Join-Flow" doc:name="Flow Reference"/>
</sub-flow>
<sub-flow name="Join-Flow" doc:name="Join-Flow">
<collection-aggregator timeout="6000" failOnTimeout="true" doc:name="Collection Aggregator"/>
<combine-collections-transformer doc:name="Combine Collections"/>
<logger level="INFO" message="Combined Payload: #[message.payload]" doc:name="Logger"/>
<set-payload value="Soap XML Response" doc:name="Set Payload"/>
</sub-flow>
删除指向连接流的流引用，删除连接流，并将其处理逻辑而不是聚合器放在分散聚集之后。因此，根据David的建议，最终工作解决方案是：-
<flow name="fork" doc:name="fork">
<http:inbound-endpoint host="localhost" port="8090" path="scattergather" exchange-pattern="request-response" doc:name="HTTP"/>
<scatter-gather timeout="6000">
<!-- Calling Flow1 -->
<flow-ref name="Flow1" doc:name="Flow Reference"/>
<!-- Calling Flow2 -->
<flow-ref name="Flow2" doc:name="Flow Reference"/>
</scatter-gather>
<!-- <collection-aggregator timeout="6000" failOnTimeout="true" doc:name="Collection Aggregator"/>
<combine-collections-transformer doc:name="Combine Collections"/> -->
<logger level="INFO" message="Combined Payload: #[message.payload]" doc:name="Logger"/>
<logger level="INFO" message="Payload1: #[message.payload[0]] and Payload2: #[message.payload[1]] " doc:name="Logger"/>
<set-payload value="Done Merging ...!!!" doc:name="Set Payload"/>
<logger message="Back to Main Flow" level="INFO" doc:name="Logger"/>
</flow>
<sub-flow name="Flow1" doc:name="Flow1">
<logger level="INFO" message="Flow1: processing started" doc:name="Logger"/>
<set-payload value="Flow1 Payload" doc:name="Set Payload"/>
<logger level="INFO" message="Flow1: processing finished" doc:name="Logger"/>
</sub-flow>
<sub-flow name="Flow2" doc:name="Flow2">
<logger level="INFO" message="Flow2: processing started" doc:name="Logger"/>
<!-- Sleep function to delay the flow2 payload -->
<set-payload value="Flow2 Payload" doc:name="Set Payload"/>
<scripting:component doc:name="Groovy">
<scripting:script engine="Groovy"><![CDATA[sleep(3000); return message.payload;]]></scripting:script>
</scripting:component>
<logger level="INFO" message="Flow2: processing finished" doc:name="Logger"/>
</sub-flow>
</mule>
因此，根据David的建议，最终工作解决方案是：-
<flow name="fork" doc:name="fork">
<http:inbound-endpoint host="localhost" port="8090" path="scattergather" exchange-pattern="request-response" doc:name="HTTP"/>
<scatter-gather timeout="6000">
<!-- Calling Flow1 -->
<flow-ref name="Flow1" doc:name="Flow Reference"/>
<!-- Calling Flow2 -->
<flow-ref name="Flow2" doc:name="Flow Reference"/>
</scatter-gather>
<!-- <collection-aggregator timeout="6000" failOnTimeout="true" doc:name="Collection Aggregator"/>
<combine-collections-transformer doc:name="Combine Collections"/> -->
<logger level="INFO" message="Combined Payload: #[message.payload]" doc:name="Logger"/>
<logger level="INFO" message="Payload1: #[message.payload[0]] and Payload2: #[message.payload[1]] " doc:name="Logger"/>
<set-payload value="Done Merging ...!!!" doc:name="Set Payload"/>
<logger message="Back to Main Flow" level="INFO" doc:name="Logger"/>
</flow>
<sub-flow name="Flow1" doc:name="Flow1">
<logger level="INFO" message="Flow1: processing started" doc:name="Logger"/>
<set-payload value="Flow1 Payload" doc:name="Set Payload"/>
<logger level="INFO" message="Flow1: processing finished" doc:name="Logger"/>
</sub-flow>
<sub-flow name="Flow2" doc:name="Flow2">
<logger level="INFO" message="Flow2: processing started" doc:name="Logger"/>
<!-- Sleep function to delay the flow2 payload -->
<set-payload value="Flow2 Payload" doc:name="Set Payload"/>
<scripting:component doc:name="Groovy">
<scripting:script engine="Groovy"><![CDATA[sleep(3000); return message.payload;]]></scripting:script>
</scripting:component>
<logger level="INFO" message="Flow2: processing finished" doc:name="Logger"/>
</sub-flow>
</mule>
在删除异步块之后，我开始并行处理它。。但是获取空指针异常。。如何删除异常？？嗨，大卫。。已删除集合属性。。但现在我的记录器中没有得到聚合结果。。它正在抛出异常空指针异常。。对你真是天才大卫。。。它起作用了。。删除了连接流，并在分散-聚集后完成了处理逻辑。。还删除了聚合器..删除异步块后，我将并行处理它。。但是获取空指针异常。。如何删除异常？？嗨，大卫。。已删除集合属性。。但现在我的记录器中没有得到聚合结果。。它正在抛出异常空指针异常。。对你真是天才大卫。。。它起作用了。。删除了连接流，并在分散-聚集后完成了处理逻辑。。还删除了聚合器..在分散聚集之后只有一个记录器：使用它有什么意义？如果您对聚合结果没有做太多的处理，那么您不需要它，也不需要全部，只需异步执行不同的消息处理器/链…现在我需要日志中的聚合结果。。我将使用此聚合结果供以后使用。在分散收集之后，您只有一个记录器：使用它有什么意义？如果您对聚合结果没有做太多的处理，那么您不需要它，也不需要全部，只需异步执行不同的消息处理器/链…现在我需要日志中的聚合结果。。我将使用此聚合结果供以后使用
[try1].ScatterGatherWorkManager.02] org.mule.api.processor.LoggerMessageProcessor: Flow2: processing started
INFO 2014-08-18 13:34:24,361 [[try1].ScatterGatherWorkManager.01] org.mule.api.processor.LoggerMessageProcessor: Flow1: processing started
INFO 2014-08-18 13:34:24,364 [[try1].ScatterGatherWorkManager.01] org.mule.api.processor.LoggerMessageProcessor: Flow1: processing finished
WARN 2014-08-18 13:34:24,366 [[try1].ScatterGatherWorkManager.01] org.mule.routing.correlation.CollectionCorrelatorCallback: Correlation Group Size not set, but correlation aggregator is being used. Message is being forwarded as is
INFO 2014-08-18 13:34:24,401 [[try1].ScatterGatherWorkManager.01] org.mule.api.processor.LoggerMessageProcessor: Combined Payload: [Flow1 Payload]
INFO 2014-08-18 13:34:26,615 [[try1].ScatterGatherWorkManager.02] org.mule.api.processor.LoggerMessageProcessor: Flow2: processing finished
ERROR 2014-08-18 13:34:26,625 [[try1].connector.http.mule.default.receiver.03] org.mule.exception.DefaultMessagingExceptionStrategy:
********************************************************************************
Message : null (java.lang.NullPointerException). Message payload is of type: String
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. null (java.lang.NullPointerException)
org.mule.api.routing.AggregationContext$1:41 (null)
2. null (java.lang.NullPointerException). Message payload is of type: String (org.mule.api.MessagingException)
org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor:32 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
java.lang.NullPointerException
at org.mule.api.routing.AggregationContext$1.evaluate(AggregationContext.java:41)
at org.apache.commons.collections.CollectionUtils.select(CollectionUtils.java:517)
at org.apache.commons.collections.CollectionUtils.select(CollectionUtils.java:498)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************
<flow name="fork" doc:name="fork">
<http:inbound-endpoint host="localhost" port="8090" path="scattergather" exchange-pattern="request-response" doc:name="HTTP"/>
<scatter-gather timeout="6000">
<!-- Calling Flow1 -->
<flow-ref name="Flow1" doc:name="Flow Reference"/>
<!-- Calling Flow2 -->
<flow-ref name="Flow2" doc:name="Flow Reference"/>
</scatter-gather>
<!-- <collection-aggregator timeout="6000" failOnTimeout="true" doc:name="Collection Aggregator"/>
<combine-collections-transformer doc:name="Combine Collections"/> -->
<logger level="INFO" message="Combined Payload: #[message.payload]" doc:name="Logger"/>
<logger level="INFO" message="Payload1: #[message.payload[0]] and Payload2: #[message.payload[1]] " doc:name="Logger"/>
<set-payload value="Done Merging ...!!!" doc:name="Set Payload"/>
<logger message="Back to Main Flow" level="INFO" doc:name="Logger"/>
</flow>
<sub-flow name="Flow1" doc:name="Flow1">
<logger level="INFO" message="Flow1: processing started" doc:name="Logger"/>
<set-payload value="Flow1 Payload" doc:name="Set Payload"/>
<logger level="INFO" message="Flow1: processing finished" doc:name="Logger"/>
</sub-flow>
<sub-flow name="Flow2" doc:name="Flow2">
<logger level="INFO" message="Flow2: processing started" doc:name="Logger"/>
<!-- Sleep function to delay the flow2 payload -->
<set-payload value="Flow2 Payload" doc:name="Set Payload"/>
<scripting:component doc:name="Groovy">
<scripting:script engine="Groovy"><![CDATA[sleep(3000); return message.payload;]]></scripting:script>
</scripting:component>
<logger level="INFO" message="Flow2: processing finished" doc:name="Logger"/>
</sub-flow>
</mule>