Encountering the error message "Unable to access the length property of undefined" while using the script mediator in WSO2 ESB

While working on transforming a JSON array to XML array in WSO2 ESB using the script mediator, I encountered an error saying "Cannot read property 'length' from undefined". Can someone please assist me in resolving this issue? Here is my script mediator code:

<script language="js"><![CDATA[
                  payload = mc.getPayloadJSON();
    results = payload.results;
    var response = <locations/>;
    for (i = 0; i < results.length; ++i) {
        var elem = results[i];
        response.locations += <jacdevice>
            <JACDeviceId>{elem.Id}</JACDeviceId>
            <Make>{elem.ManufacturerName}</Make>
            <Model>{elem.ModelName}</Model>
        </jacdevice>
    }
    mc.setPayloadXML(response);
                ]]></script>

The detailed error message is as follows:

ERROR {org.apache.synapse.mediators.bsf.ScriptMediator} -  The script engine returned an error executing the inlined js script function mediate {org.apache.synapse.mediators.bsf.ScriptMediator}
com.sun.phobos.script.util.ExtendedScriptException: org.mozilla.javascript.EcmaError: TypeError: Cannot read property "length" from undefined (<Unknown Source>#4) in <Unknown Source> at line number 4
    at com.sun.phobos.script.javascript.RhinoCompiledScript.eval(RhinoCompiledScript.java:68)
    at javax.script.CompiledScript.eval(CompiledScript.java:92)
    at org.apache.synapse.mediators.bsf.ScriptMediator.mediateForInlineScript(ScriptMediator.java:333)
    at org.apache.synapse.mediators.bsf.ScriptMediator.invokeScript(ScriptMediator.java:265)
    at org.apache.synapse.mediators.bsf.ScriptMediator.mediate(ScriptMediator.java:233)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
    at org.apache.synapse.mediators.eip.splitter.IterateMediator.mediate(IterateMediator.java:256)
    at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:267)
    at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.mediateFromContinuationStateStack(Axis2SynapseEnvironment.java:766)
    at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:282)
    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:261)
    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:748)
javascriptarrayswso2esbmediator

Answer №1

Opt for results = payload.Results; over results = payload.results;

If the above doesn't yield results, consider this alternative.

var jsonData = JSON.parse(payload)
results = jsonData.Results;

Answer №2

Looks like you're getting a clear message from the error. It seems to be pointing out the issue at this specific line:

for (i = 0; i < results.length; ++i) {

The variable results hasn't been defined.

This suggests that either your call to mc.getPayloadJSON() didn't work as expected, or it returned data in a different format than what you were anticipating. I recommend starting your debugging process from there.

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