Problem Injecting value into MultiItemResourceReader

[fruitloop]

Hi,

I'm trying to inject the filename from jobParameters into a custom MultiItemResourceReader at step scope.

I'm getting this error :

Caused by: java.lang.IllegalStateException: Cannot convert value of type [$Proxy10 implementing org.springframework.batch.item.ItemReader,org.springframework.batch.item.ItemStream,org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [xxx.xxx.itemReaders.CustomeMultiResourceReader] for property 'resource': no matching editors or conversion strategy found
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:231)
	at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:447)

here is my xml config

<batch:step id="decompress" next="readWriteUnmatched">
<batch:tasklet ref="decompressTasklet" />
</batch:step>
<batch:step id="readWriteUnmatched" next="readWriteMatched">
			<batch:tasklet>
				<batch:chunk reader="multiResourcesReaderUn" processor="unmatchedProcessor" writer="unmatchedWriter" commit-interval="1" skip-limit="99999">
					<batch:skippable-exception-classes>
						<batch:include class="java.lang.Exception"/>
					</batch:skippable-exception-classes>
				</batch:chunk>
			</batch:tasklet>
			<batch:listeners>
				<batch:listener ref="unmatchedSkipListener"/>
				<batch:listener ref="unmatchedFileChangeListener"/>
			</batch:listeners>
</batch:step>

<bean id="decompressTasklet" class="xxx.xxx.DecompressTasklet" scope="step">
		<property name="inputResource" value="file:///#{jobParameters['inputResource']}" />
		<property name="targetDirectory" value="#{jobParameters['targetDirectory']}" />
</bean>

<bean id="multiResourcesReaderUn" class="xxx.xxx.itemReaders.CustomeMultiResourceReader" scope="step" >
		<constructor-arg ref="dataSource"/>
		<property name="archiveFile" value="#{jobParameters['inputResource']}"/>
		<property name="resources" value="file:///C:/output/*_UNMATCHED.csv" />
		<property name="delegate" ref="flatFileItemReaderUnmatched"/>
</bean>

It works perfectly fine for the decompressTasklet but not for the multiResourceReaderUn.

Any help would be appreciated.

[Marten Deinum]

Program to interfaces not concrete implementations. You are using proxies and it is a JDK proxy which acts like all the interfaces it implements NOT as the concrete class (hence the classcast exception)

[fruitloop]

Thanks, guess I should go and read up on proxies..

Is there anything else I can do in the mean time to solve this problem ?

[Marten Deinum]

As I already mentioned in the previous post program to interfaces not concrete classes.

Also it is not complaining about what you think it is complaining about, I suggest you take a look at the stacktrace again. It isn't complaining about the resource on your CustomeMultiResourceReader but you are injecting your CustomeMultiResourceReader into a bean which expects just this type insteaf of a ItemReader or ItemStreamReader,