[CAMEL-9022] JacksonTypeConverter breaks CSV marshalling

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.16.0
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Thomas Diesler
• Created: 27/Jul/15 11:46
• Updated: 13/Aug/15 08:04
• Resolved: 27/Jul/15 12:36

Description

Marshalling a Map to CSV internally converts a Map to a List. It seems that the JacksonTypeConverters now claim to be able to this. It however fails with

Caused by: org.apache.camel.TypeConversionException: Error during type conversion from type: java.lang.String to the required type: java.util.List with value {firstName=John, lastName=Doe} due java.lang.IllegalArgumentException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
 at [Source: N/A; line: -1, column: -1]
	at org.apache.camel.impl.converter.BaseTypeConverterRegistry.createTypeConversionException(BaseTypeConverterRegistry.java:585)
	at org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:131)
	at org.apache.camel.util.ExchangeHelper.convertToType(ExchangeHelper.java:203)
	at org.apache.camel.dataformat.csv.CsvMarshaller.marshal(CsvMarshaller.java:77)
	at org.apache.camel.dataformat.csv.CsvDataFormat.marshal(CsvDataFormat.java:78)
	at org.apache.camel.processor.MarshalProcessor.process(MarshalProcessor.java:83)
	at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
	at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:454)
	at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
	at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
	at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:62)
	at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
	at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:109)
	at org.apache.camel.processor.UnitOfWorkProducer.process(UnitOfWorkProducer.java:68)
	at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:404)
	at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:372)
	at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:262)
	at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:372)
	at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:230)
	at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:128)
	at org.apache.camel.impl.DefaultProducerTemplate.sendBody(DefaultProducerTemplate.java:132)
	... 147 more
Caused by: org.apache.camel.RuntimeCamelException: java.lang.IllegalArgumentException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
 at [Source: N/A; line: -1, column: -1]
	at org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1642)
	at org.apache.camel.util.ObjectHelper.invokeMethod(ObjectHelper.java:1247)
	at org.apache.camel.impl.converter.StaticMethodFallbackTypeConverter.convertTo(StaticMethodFallbackTypeConverter.java:62)
	at org.apache.camel.impl.converter.BaseTypeConverterRegistry.doConvertTo(BaseTypeConverterRegistry.java:327)
	at org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:114)
	... 166 more
Caused by: java.lang.IllegalArgumentException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
 at [Source: N/A; line: -1, column: -1]
	at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:3286)
	at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:3212)
	at org.apache.camel.component.jackson.converter.JacksonTypeConverters.convertTo(JacksonTypeConverters.java:44)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at org.apache.camel.util.ObjectHelper.invokeMethod(ObjectHelper.java:1243)
	... 169 more
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
 at [Source: UNKNOWN; line: -1, column: -1]
	at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
	at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:835)
	at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:831)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.handleNonArray(CollectionDeserializer.java:283)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:222)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:212)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:25)
	at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:3281)
	... 176 more

CrossRef: https://github.com/wildfly-extras/wildfly-camel/issues/784

Issue Links

• is related to: CAMEL-8554 camel-jackson should provide Map => Object converter