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https://issues.apache.org/jira/browse/CAMEL-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13106038#comment-13106038
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Mathieu Lalonde commented on CAMEL-4449:
----------------------------------------
XStream can serialize classes even if they don't implement Serializable. Did
the the class for you message body implement Serializable? If not, then it was
suppose to fail so the resolution might just be to give a more descriptive
error message and perhaps a more meaningful exception?!
> NullPointerException when unmarshalling using serialization data format
> -----------------------------------------------------------------------
>
> Key: CAMEL-4449
> URL: https://issues.apache.org/jira/browse/CAMEL-4449
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 2.8.0
> Environment: MacOS X 10.6.8
> Java 1.6.0_26
> Apache Camel 2.8.0
> Consuming from remote Kestrel queue (XStream marshalling/unmarshalling works
> just fine)
> Reporter: Vadim TSes'ko
> Fix For: 2.9.0
>
>
> Spring configuration:
> {code:xml}
> <!-- A custom CamelContext -->
> <camel:camelContext id="camel">
> <!-- JSON data format marshalling -->
> <camel:dataFormats>
> <camel:serialization id="serialization"/>
> </camel:dataFormats>
> <!-- RawOffer input route -->
> <camel:route>
> <camel:from uri="kestrel://etl01f/feeds"/>
> <camel:unmarshal ref="serialization"/>
> <camel:to uri="bean:shard?method=consume"/>
> </camel:route>
> </camel:camelContext>
> {code}
> Exception:
> {code:java}
> run:
> [java] log4j:WARN No appenders could be found for logger
> (org.springframework.context.support.ClassPathXmlApplicationContext).
> [java] log4j:WARN Please initialize the log4j system properly.
> [java] log4j:WARN See
> http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
> [java] 13:28:07.587 [main] INFO o.a.c.s.h.CamelNamespaceHandler - OSGi
> environment not detected.
> [java] 13:28:09.028 [main] INFO o.a.camel.spring.SpringCamelContext -
> Apache Camel 2.8.0 (CamelContext: camel) is starting
> [java] 13:28:09.028 [main] INFO o.a.camel.spring.SpringCamelContext -
> JMX enabled. Using ManagedManagementStrategy.
> [java] 13:28:09.415 [main] INFO o.a.c.i.c.AnnotationTypeConverterLoader
> - Found 3 packages with 14 @Converter classes to load
> [java] 13:28:09.489 [main] INFO o.a.c.i.c.DefaultTypeConverter - Loaded
> 153 core type converters (total 153 type converters)
> [java] 13:28:09.528 [main] INFO o.a.c.i.c.DefaultTypeConverter - Loaded
> additional 0 type converters (total 153 type converters) in 0.003 seconds
> [java] 13:28:09.730 [main] INFO o.a.c.c.kestrel.KestrelComponent -
> Creating endpoint for queue "feeds" on etl01f, parameters={}
> [java] 13:28:09.967 [main] INFO o.a.c.c.kestrel.KestrelComponent -
> Creating MemcachedClient for etl01f/feeds
> [java] 2011-09-14 13:28:10.073 INFO
> net.spy.memcached.MemcachedConnection: Added {QA
> sa=etl01f/95.108.229.218:22133, #Rops=0, #Wops=0, #iq=0, topRop=null,
> topWop=null, toWrite=0, interested=0} to connect queue
> [java] 2011-09-14 13:28:10.084 INFO
> net.spy.memcached.MemcachedConnection: Connection state changed for
> sun.nio.ch.SelectionKeyImpl@711b50a1
> [java] 13:28:10.293 [main] INFO o.a.c.c.kestrel.KestrelConsumer -
> Starting consumer for kestrel://etl01f/feeds
> [java] 13:28:10.302 [main] INFO o.a.camel.spring.SpringCamelContext -
> Route: route1 started and consuming from: Endpoint[kestrel://etl01f/feeds]
> [java] 13:28:10.318 [main] INFO o.a.camel.spring.SpringCamelContext -
> Total 1 routes, of which 1 is started.
> [java] 13:28:10.318 [main] INFO o.a.camel.spring.SpringCamelContext -
> Apache Camel 2.8.0 (CamelContext: camel) started in 1.291 seconds
> [java] 13:28:12.858 [Camel (camel) thread #0 -
> Poller-kestrel://etl01f/feeds] ERROR o.a.c.processor.DefaultErrorHandler -
> Failed delivery for exchangeId: ID-incubos-osx-local-51787-1315992488896-0-1.
> Exhausted after delivery attempt: 1 caught: java.lang.NullPointerException
> [java] java.lang.NullPointerException: null
> [java] at
> org.apache.camel.impl.SerializationDataFormat.unmarshal(SerializationDataFormat.java:57)
> ~[camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.UnmarshalProcessor.process(UnmarshalProcessor.java:56)
> ~[camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.impl.converter.AsyncProcessorTypeConverter$ProcessorToAsyncProcessorBridge.process(AsyncProcessorTypeConverter.java:50)
> ~[camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:98)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:89)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:69)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:98)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:89)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:99)
> ~[camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:318)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:209)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:305)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.Pipeline.process(Pipeline.java:116)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.Pipeline.process(Pipeline.java:79)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:102)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:98)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:89)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:69)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:104)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:85)
> [camel-core-2.8.0.jar:2.8.0]
> [java] at
> org.apache.camel.component.kestrel.KestrelConsumer$Poller.run(KestrelConsumer.java:230)
> [camel-kestrel-2.8.0.jar:2.8.0]
> [java] at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> [na:1.6.0_26]
> [java] at
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> [na:1.6.0_26]
> [java] at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> [na:1.6.0_26]
> [java] at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> [na:1.6.0_26]
> [java] at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> [na:1.6.0_26]
> [java] at java.lang.Thread.run(Thread.java:680) [na:1.6.0_26]
> {code}
> It seems that {{ExchangeHelper.convertToType()}} method returned {{null}}
> because {{camelContext.getTypeConverter()}} returned {{null}}.
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