wso2 data mapper SequenceMediator Runtime error

Question

I am trying to use the data mapper to map the response from two(2) different api. So what I did was use the clone mediator and aggregate mediator to merge these two api together and then map it using the data mapper but when I get on the data mapper part I always get an error. It works if I removed the data mapper mediator part.

Here's my api

<?xml version="1.0" encoding="UTF-8"?>
<api context="/test" name="test" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="GET">
        <inSequence>
            <property name="ROOT" scope="default">
                <root:movie xmlns:root="www.wso2esb.com"/>
            </property>
            <log level="full"/>
            <clone continueParent="true" id="movie" sequential="true">
                <target>
                    <sequence>
                        <send>
                            <endpoint>
                                <address format="rest" uri="https://api.themoviedb.org/3/movie/tt0918940?api_key=code"/>
                            </endpoint>
                        </send>
                    </sequence>
                </target>
                <target>
                    <sequence>
                        <send>
                            <endpoint>
                                <address format="rest" uri="https://www.omdbapi.com/?type=movie&amp;i=tt0918940"/>
                            </endpoint>
                        </send>
                    </sequence>
                </target>
            </clone>
        </inSequence>
        <outSequence>
            <aggregate id="movie">
                <completeCondition>
                    <messageCount max="-1" min="-1"/>
                </completeCondition>
                <onComplete enclosingElementProperty="ROOT" expression="//jsonObject/*" xmlns:dummy="http://org.dummy" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
                    <datamapper config="gov:datamapper/TestMapping.dmc" inputSchema="gov:datamapper/TestMapping_inputSchema.json" inputType="JSON" outputSchema="gov:datamapper/TestMapping_outputSchema.json" outputType="JSON"/>
            <property name="messageType" scope="axis2" type="STRING" value="application/json"/>
            <respond/>
                </onComplete>
            </aggregate>

        </outSequence>
    </resource>
</api>

and here's my log

[2016-07-21 09:33:56,180] ERROR - SequenceMediator Runtime error occurred while mediating the message
java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:78)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:72)
    at org.wso2.carbon.mediator.datamapper.engine.input.readers.JSONInputReader.readFromInputStream(JSONInputReader.java:76)
    at org.wso2.carbon.mediator.datamapper.engine.input.readers.JSONInputReader.read(JSONInputReader.java:59)
    at org.wso2.carbon.mediator.datamapper.engine.input.InputBuilder.buildInputModel(InputBuilder.java:59)
    at org.wso2.carbon.mediator.datamapper.engine.core.mapper.MappingHandler.doMap(MappingHandler.java:67)
    at org.wso2.carbon.mediator.datamapper.DataMapperMediator.transform(DataMapperMediator.java:306)
    at org.wso2.carbon.mediator.datamapper.DataMapperMediator.mediate(DataMapperMediator.java:256)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:95)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:57)
    at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
    at org.apache.synapse.mediators.eip.aggregator.AggregateMediator.completeAggregate(AggregateMediator.java:447)
    at org.apache.synapse.mediators.eip.aggregator.AggregateMediator.mediate(AggregateMediator.java:330)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:95)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:57)
    at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
    at org.apache.synapse.rest.Resource.process(Resource.java:325)
    at org.apache.synapse.rest.API.process(API.java:338)
    at org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.java:125)
    at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:101)
    at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:56)
    at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:300)
    at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:554)
    at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:188)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
    at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:255)
    at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

Answer 1

Please check your governance registry whether you add configuration correctly into ESB. (Navigate to Governance registry)

You will get null pointer exception as it can't find relevant details. Please add relevant configurations and test.