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From shirazi ...@farhad.eu>
Subject camel casts exception when there is nothing to fetch from the ftp endpoint
Date Fri, 27 Nov 2009 11:55:21 GMT

Hi,
Please consider the following route:

from("timer://someTrigger?delay=30000&fixedRate=true&period=300000").		
pollEnrich("ftp://cmoreFtp?binary=true&localWorkDirectory=/tmp&idempotent=true&idempotentRepository=#caStreams",
10000).	
to("file:///tmp/vw/cmore?tempPrefix=.inprogress");

The pollEnrich cast a NullPointerException in camel-2.0, if there is nothing
to fetch from the ftp. I got rid of the exception by a
"try-catch(NullpointerExcpetion.class).stop()" around the route. Now in
camel-2.1-SNAPSHOT, I get the following exception on the "to" endpoint:
=================
12:37:06,899 INFO  [Tracer] >>>  -->
file:///tmp/vw/cmore?tempPrefix=.inprogress_, Pattern:InOnly,
Headers:{firedTime=Fri Nov 27 12:36:56 CET 2009},
Exception:org.apache.camel.component.file.GenericFileOperationFailedException:
Cannot store file:
/tmp/vw/cmore/.inprogress_02216f38-8ffc-4aec-b638-27229d857075
12:37:06,899 INFO  [Tracer] >>>  -->
file:///tmp/vw/cmore?tempPrefix=.inprogress_, Pattern:InOnly,
Headers:{firedTime=Fri Nov 27 12:36:56 CET 2009},
Exception:org.apache.camel.component.file.GenericFileOperationFailedException:
Cannot store file:
/tmp/vw/cmore/.inprogress_02216f38-8ffc-4aec-b638-27229d857075
12:37:06,899 ERROR [TimerConsumer] Cannot store file:
/tmp/vw/cmore/.inprogress_02216f38-8ffc-4aec-b638-27229d857075
org.apache.camel.component.file.GenericFileOperationFailedException: Cannot
store file: /tmp/vw/cmore/.inprogress_02216f38-8ffc-4aec-b638-27229d857075
	at
org.apache.camel.component.file.FileOperations.storeFile(FileOperations.java:204)
	at
org.apache.camel.component.file.GenericFileProducer.writeFile(GenericFileProducer.java:184)
	at
org.apache.camel.component.file.GenericFileProducer.processExchange(GenericFileProducer.java:126)
	at
org.apache.camel.component.file.GenericFileProducer.process(GenericFileProducer.java:57)
	at
org.apache.camel.processor.SendProcessor$1.doInProducer(SendProcessor.java:97)
	at
org.apache.camel.processor.SendProcessor$1.doInProducer(SendProcessor.java:95)
	at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:146)
	at
org.apache.camel.processor.SendProcessor.doProcess(SendProcessor.java:94)
	at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:82)
	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:162)
	at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
	at
org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:206)
	at org.apache.camel.processor.Pipeline.process(Pipeline.java:74)
	at org.apache.camel.processor.TryProcessor.process(TryProcessor.java:63)
	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:162)
	at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
	at
org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:206)
	at
org.apache.camel.processor.UnitOfWorkProcessor.processNext(UnitOfWorkProcessor.java:54)
	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.timer.TimerConsumer.sendTimerExchange(TimerConsumer.java:103)
	at
org.apache.camel.component.timer.TimerConsumer$1.run(TimerConsumer.java:50)
	at java.util.TimerThread.mainLoop(Timer.java:512)
	at java.util.TimerThread.run(Timer.java:462)
Caused by: org.apache.camel.InvalidPayloadException: No body available of
type: java.io.InputStream on: Message: [Body is null]. Caused by: No type
converter available to convert from type: null to the required type:
java.io.InputStream with value null on the exchange: Exchange[Message: [Body
is null]]
	at
org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:103)
	at
org.apache.camel.util.ExchangeHelper.getMandatoryInBody(ExchangeHelper.java:116)
	at
org.apache.camel.component.file.FileOperations.storeFile(FileOperations.java:198)
	... 29 more
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type
converter available to convert from type: null to the required type:
java.io.InputStream with value null
	at
org.apache.camel.impl.converter.DefaultTypeConverter.mandatoryConvertTo(DefaultTypeConverter.java:126)
	at
org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:101)
	... 31 more
============
Now, I can remedy the situation by a try-catch block or an interceptor, but
in my opinion this should be considered a bug in camel and it should
silently ignore if there was nothing to fetch from the ftp. 

Bests,
Farhad Shiraz

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