AggregationStrategy returning null causes NPE
---------------------------------------------
Key: CAMEL-2744
URL: https://issues.apache.org/activemq/browse/CAMEL-2744
Project: Apache Camel
Issue Type: Bug
Components: camel-core
Affects Versions: 2.3.0
Reporter: Glenn Moss
Priority: Minor
When the AggregationStrategy's aggregate method returns null, the
AggregateProcessor throws an NPE. While this is a result of user error, I think
it would be easy to provide a more useful error indicating what the true
problem is. This is the (not very helpful) error the user sees:
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ERROR | Caused by: [org.apache.camel.RuntimeCamelException -
java.lang.NullPointerException]
org.apache.camel.RuntimeCamelException: java.lang.NullPointerException
at
org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1117)
at
org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:104)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:543)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:482)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:451)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:323)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:261)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:982)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:974)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:876)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at
org.apache.camel.processor.aggregate.AggregateProcessor.doAggregation(AggregateProcessor.java:227)
at
org.apache.camel.processor.aggregate.AggregateProcessor.process(AggregateProcessor.java:182)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.DelegateProcessor.processNext(DelegateProcessor.java:53)
at
org.apache.camel.processor.DelegateProcessor.proceed(DelegateProcessor.java:82)
at
org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:97)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.RedeliveryErrorHandler.processExchange(RedeliveryErrorHandler.java:185)
at
org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:151)
at
org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:89)
at
org.apache.camel.processor.DefaultErrorHandler.process(DefaultErrorHandler.java:49)
at
org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:228)
at
org.apache.camel.processor.UnitOfWorkProcessor.processNext(UnitOfWorkProcessor.java:70)
at
org.apache.camel.processor.DelegateProcessor.process(DelegateProcessor.java:48)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:84)
... 9 more
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