Re: Intermittent error: No content to map due to end-of-input

[shanaloh]

I read this thread and added convertBodyTo(String.class) after the wiretap
and before unmarshal(). the error is gone.

http://t166678.apache-camel-user.apacheforum.info/wiretap-problem-t166678.html

any idea why a convert to string will resolve the issue? 



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Re: Intermittent error: No content to map due to end-of-input

[shanaloh]

Hi Willem, 

The only thing before the unmarshal is the wiretap. I am almost certain the
issue is with the wiretap. 

RouteDefinition rdRouteDefinition = from( createListeningService()
).routeId( getRouteId() ); 
*rdRouteDefinition.wireTap(ABCMaintenanceRouteDefinition.AUDIT_LOGGING.getCamelRoute()
);* 
rdRouteDefinition.unmarshal().json(JsonLibrary.Jackson,
ExecutionRequest.class) 


* removed wiretap, i cannot re-produce the issue (tried 100 requests)
* added wiretap back, the error comes back intermittently 


I don't know why the wiretap should cause such issue tho. The Wiretap page
suggests the use of stream caching and we have adopted too. Any suggestions?

Thanks

Shan






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Intermittent error: No content to map due to end-of-input

[shanaloh]

hi guys,

I am quite new to Camel. We are using Camel 2.14.

I got this intermittent error which is quite annoying. It happens very
rarely and randomly. If I send the same request again, it will process just
fine.

2014-12-15 17:24:56.700 ERROR 1852673485@qtp-1010937526-2
common.exception.MTSErrorHandler Received Exception
com.fasterxml.jackson.databind.JsonMappingException: No content to map due
to end-of-input
at Source: org.apache.camel.converter.stream.InputStreamCache@64288413;
line: 1, column: 1

After searching this exception, I have seen many places where people suggest
to use stream caching. However in our case, stream caching is already used.
I am not sure however if it is set up properly.

Thanks in advance for any your inputs.

Cheers

Shan

*This is our camel context config*

camel:camelContext id=camelContext errorHandlerRef=errorHandler
trace=${camel.trace:false} streamCache=true

When project starts up, this line indicates it is enabled:
2014-12-16 16:13:04.300 INFO  [main] [camel.spring.SpringCamelContext]
StreamCaching is enabled on CamelContext: camelContext



*This is our code.*


RouteDefinition rdRouteDefinition = from( 
createListeningService()
).routeId( getRouteId() );
rdRouteDefinition.wireTap(
ABCMaintenanceRouteDefinition.AUDIT_LOGGING.getCamelRoute() );
rdRouteDefinition
.process(new Processor() {

@Override
public void process(Exchange exchange) throws Exception 
{
_log.info(Before unmarshall() );
_log.info(exchange body =  + 
exchange.getIn().getBody());
_log.info(exchange body size =  +
exchange.getIn().getBody(InputStreamCache.class).length());
}

})
.unmarshal().json(JsonLibrary.Jackson, ExecutionRequest.class)
.to(ABCRouteType.VALIDATOR.getRoutePrefix() + requestXsd)
.convertBodyTo(FIXExecutionReport.class)
.process(fixMessageProcessor)
.wireTap( ABCRouteType.LOG.getRoutePrefix() + _log.getName() +
ABCGenericConstants.LOGGING_ROUTE_OPTIONS )
.inOnly( routeType.getRoutePrefix() + publishingDestination );

rdRouteDefinition.wireTap(
ABCMaintenanceRouteDefinition.AUDIT_LOGGING.getCamelRoute() );



*This is the logging *

2014-12-15 17:24:56.682 INFO 1852673485@qtp-1010937526-2  Before
unmarshall()
2014-12-15 17:24:56.682 INFO 1852673485@qtp-1010937526-2  exchange body =
org.apache.camel.converter.stream.InputStreamCache@64288413
2014-12-15 17:24:56.683 INFO 1852673485@qtp-1010937526-2  exchange body size
= 646

2014-12-15 17:24:56.700 ERROR 1852673485@qtp-1010937526-2
common.exception.ABCErrorHandler Received Exception
com.fasterxml.jackson.databind.JsonMappingException: No content to map due
to end-of-input
at Source: org.apache.camel.converter.stream.InputStreamCache@64288413;
line: 1, column: 1



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