'null' when using "ItemAt" transformation from List<> -> Number

[mmelko]

I have simple mapping from List to Double type field. When I add "ItemAt" transformaion I'm getting following exception from camel during processing of mapping:

io.atlasmap.api.AtlasException: Errors: [Unexpected exception is thrown while reading source field: null: docId='io.atlasmap.qe.test.SourceListsClass', path='/strings<>'], 
	at org.apache.camel.component.atlasmap.AtlasEndpoint.onExchange(AtlasEndpoint.java:213)
	at org.apache.camel.impl.ProcessorEndpoint$1.process(ProcessorEndpoint.java:71)
	at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
	at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:148)
	at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548)
	at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
	at org.apache.camel.processor.Pipeline.process(Pipeline.java:138)
	at org.apache.camel.processor.Pipeline.process(Pipeline.java:101)
	at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
	at org.apache.camel.component.direct.DirectBlockingProducer.process(DirectBlockingProducer.java:53)
	at org.apache.camel.processor.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:186)
	at org.apache.camel.processor.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:86)
	at org.apache.camel.impl.ProducerCache$1.doInProducer(ProducerCache.java:541)
	at org.apache.camel.impl.ProducerCache$1.doInProducer(ProducerCache.java:506)
	at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:369)
	at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:506)
	at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:229)
	at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:144)
	at org.apache.camel.impl.DefaultProducerTemplate.sendBodyAndProperty(DefaultProducerTemplate.java:223)
	at org.apache.camel.impl.DefaultProducerTemplate.sendBodyAndProperty(DefaultProducerTemplate.java:218)
	at io.atlasmap.qe.test.MappingValidator.processMappingInputMap(MappingValidator.java:94)
	at io.atlasmap.qe.test.MappingValidator.processMapping(MappingValidator.java:69)
	at io.atlasmap.qe.test.MappingValidator.verifyMapping(MappingValidator.java:103)
	at io.atlasmap.qe.test.MappingValidator.verifyMapping(MappingValidator.java:145)
	at io.atlasmap.qe.test.atlas.steps.BackendSteps.saveAndVerifyMappingAs(BackendSteps.java:95)
	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:498)
	at cucumber.runtime.Utils$1.call(Utils.java:32)
	at cucumber.runtime.Timeout.timeout(Timeout.java:16)
	at cucumber.runtime.Utils.invoke(Utils.java:26)
	at cucumber.runtime.java.JavaStepDefinition.execute(JavaStepDefinition.java:37)
	at cucumber.runtime.StepDefinitionMatch.runStep(StepDefinitionMatch.java:40)
	at cucumber.api.TestStep.executeStep(TestStep.java:102)
	at cucumber.api.TestStep.run(TestStep.java:83)
	at cucumber.api.TestCase.run(TestCase.java:58)
	at cucumber.runner.Runner.runPickle(Runner.java:80)
	at cucumber.runtime.junit.PickleRunners$NoStepDescriptions.run(PickleRunners.java:140)
	at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:68)
	at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:23)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at cucumber.runtime.junit.FeatureRunner.run(FeatureRunner.java:73)
	at cucumber.api.junit.Cucumber.runChild(Cucumber.java:99)
	at cucumber.api.junit.Cucumber.runChild(Cucumber.java:41)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at cucumber.api.junit.Cucumber$1.evaluate(Cucumber.java:108)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)

<Mappings>
        <Mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Collection" collectionType="List" mappingType="Collection">
            <Mappings>
                <Mapping xsi:type="Mapping" id="mapping.322350" mappingType="Map">
                    <InputField xsi:type="ns2:JavaField" name="strings" docId="io.atlasmap.qe.test.SourceListsClass" path="/strings&lt;&gt;" fieldType="String">
                        <Actions>
                            <ItemAt index="5"/>
                        </Actions>
                    </InputField>
                    <OutputField xsi:type="ns2:JavaField" name="targetDouble" docId="io.atlasmap.qe.test.TargetMappingTestClass" path="/targetDouble" fieldType="Double"/>
                </Mapping>
            </Mappings>
        </Mapping>

[igarashitm]

Maybe ArrayIndexOutOfBoundsException was thrown? is the array size <5?

[igarashitm]

As it's string > double it could be number format exception as well. Which one is this test for?

[mmelko]

well behavior is the same for string, integer double. Array has size=10; In this case it was string but I'm testing it with integers. I believe it might be a problem with resolution of source field: Unexpected exception is thrown while reading source field: null:

[igarashitm]

Can you get a debug log? This line should emit a original stacktrace
https://github.com/atlasmap/atlasmap/blob/master/runtime/core/src/main/java/io/atlasmap/core/DefaultAtlasContext.java#L506

[igarashitm]

Nevermind, I managed to reproduce