WSO2 ESB payload factory XML Exception

0
votes

Lately any attempt to call API resources on my ESB has resulted in an XML exception (stack trace below) when run by the payloadFactory. Removing the payloadFactory in its entirety seems to be the only way to resolve this. I can have no args, empty format, or completely static args and format in ways that should work, and did work yesterday!

The build is on ESB 5.0.0 and an example of such a resource looks like this:

<resource methods="POST" uri-template="/someUrl">
    <inSequence>
        <property name="acceptedRoles" value="RMD" scope="default" type="STRING/>
        <property name="myProp" value="json-eval($)" scope="default" type="STRING"/>
        <Package.ConnectorOne/>
        <Package.ConnectorTwo/>
        <loopback/>
    </inSequence>
    <outSequence>
        <payloadFactory media-type="json">
            <format>{"statusCode":$1,"errorMessage":"$2","errors":$3}</format>
            <args>
                <arg evaluator="xml" expression="get-property('statusCode')/>
                <arg evaluator="xml" expression="get-property('errorMessage')/>
                <arg evaluator="xml" expression="get-property('errors')/>
            </args>
        <payloadFactory>
        <send/>
    </outSequence>
    <faultSequence/>
</resource>

Exception stack traces:

TID[-1234] [ESB] [2017-03-21 19:22:33,024] ERROR
{API_LOGGER.FleetManagement} - javax.xml.stream.XMLStreamException:
Unexpected symbol: START_OBJECT
org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296)
org.apache.axiom.om.impl.llom.OMElementImpl.buildNext(OMElementImpl.java:653
)
org.apache.axiom.om.impl.llom.OMSourcedElementImpl.buildNext(OMSourcedElemen
tImpl.java:880)
org.apache.axiom.om.impl.llom.OMNodeImpl.getNextOMSibling(OMNodeImpl.java:12
2)
org.apache.axiom.om.impl.llom.OMElementImpl.getNextOMSibling(OMElementImpl.j
ava:343)
org.apache.axiom.om.impl.traverse.OMChildrenIterator.getNextNode(OMChildrenI
terator.java:36)
org.apache.axiom.om.impl.traverse.OMAbstractIterator.hasNext(OMAbstractItera
tor.java:58)
org.apache.synapse.commons.json.JsonUtil.removeIndentations(JsonUtil.java:41
8)
org.apache.synapse.commons.json.JsonUtil.removeIndentations(JsonUtil.java:42
5)
org.apache.synapse.commons.json.JsonUtil.getNewJsonPayload(JsonUtil.java:587
)
org.apache.synapse.commons.json.JsonUtil.getNewJsonPayload(JsonUtil.java:654
)
org.apache.synapse.mediators.transform.PayloadFactoryMediator.mediate(Payloa
dFactoryMediator.java:173)
org.apache.synapse.mediators.transform.PayloadFactoryMediator.mediate(Payloa
dFactoryMediator.java:104)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:97)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:59)
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.
java:158) org.apache.synapse.rest.Resource.process(Resource.java:343)
org.apache.synapse.rest.API.process(API.java:338)
org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.jav
a:123)
org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.
java:101)
org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:5
6)
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2Syn
apseEnvironment.java:304)
org.apache.synapse.mediators.builtin.LoopBackMediator.mediate(LoopBackMediat
or.java:63)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:97)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:59)
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.
java:158) org.apache.synapse.rest.Resource.process(Resource.java:343)
org.apache.synapse.rest.API.process(API.java:399)
org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.jav
a:123)
org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.
java:101)
org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:6
9)
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2Syn
apseEnvironment.java:304)
org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageR
eceiver.java:75)
org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosing
RESTHandler(ServerWorker.java:325)
org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingReq
uest(ServerWorker.java:371)
org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:151
)
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerP
ool.java:172) java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)

And

javax.xml.stream.XMLStreamException: Unexpected symbol: START_OBJECT
org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296)
org.apache.axiom.om.impl.llom.OMElementImpl.buildNext(OMElementImpl.java:653
)
org.apache.axiom.om.impl.llom.OMSourcedElementImpl.buildNext(OMSourcedElemen
tImpl.java:880)
org.apache.axiom.om.impl.llom.OMNodeImpl.getNextOMSibling(OMNodeImpl.java:12
2)
org.apache.axiom.om.impl.llom.OMElementImpl.getNextOMSibling(OMElementImpl.j
ava:343)
org.apache.axiom.om.impl.traverse.OMChildrenIterator.getNextNode(OMChildrenI
terator.java:36)
org.apache.axiom.om.impl.traverse.OMAbstractIterator.hasNext(OMAbstractItera
tor.java:58)
org.apache.synapse.commons.json.JsonUtil.removeIndentations(JsonUtil.java:41
8)
org.apache.synapse.commons.json.JsonUtil.removeIndentations(JsonUtil.java:42
5)
org.apache.synapse.commons.json.JsonUtil.getNewJsonPayload(JsonUtil.java:587
)
org.apache.synapse.commons.json.JsonUtil.getNewJsonPayload(JsonUtil.java:654
)
org.apache.synapse.mediators.transform.PayloadFactoryMediator.mediate(Payloa
dFactoryMediator.java:173)
org.apache.synapse.mediators.transform.PayloadFactoryMediator.mediate(Payloa
dFactoryMediator.java:104)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:97)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:59)
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.
java:158) org.apache.synapse.rest.Resource.process(Resource.java:343)
org.apache.synapse.rest.API.process(API.java:338)
org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.jav
a:123)
org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.
java:101)
org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:5
6)
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2Syn
apseEnvironment.java:304)
org.apache.synapse.mediators.builtin.LoopBackMediator.mediate(LoopBackMediat
or.java:63)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:97)
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediat
or.java:59)
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.
java:158) org.apache.synapse.rest.Resource.process(Resource.java:343)
org.apache.synapse.rest.API.process(API.java:399)
org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.jav
a:123)
org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.
java:101)
org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:6
9)
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2Syn
apseEnvironment.java:304)
org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageR
eceiver.java:75)
org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosing
RESTHandler(ServerWorker.java:325)
org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingReq
uest(ServerWorker.java:371)
org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:151
)
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerP
ool.java:172) java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
2
wso2wso2esb

2 Answers

1
votes

I guess the problem is the expression type in the payload factory mediator while passing the arguments to the json.

*<payloadFactory media-type="json">
            <format>{"statusCode":$1,"errorMessage":"$2","errors":$3}</format>
            <args>
                <***arg evaluator="xml"*** expression="get-property('statusCode')/>
                <arg evaluator="xml" expression="get-property('errorMessage')/>
                <arg evaluator="xml" expression="get-property('errors')/>
            </args>
        <payloadFactory>*

change the value of arg evaluator="xml" expression="get-property('statusCode') from xml to arg evaluator="json" expression="get-property('statusCode')json and give it a try. I believe the exception is due to parsing xml as json.

Comment if the error isn't resolved. Thanks

1
votes

Perhaps the arguments you are trying to inject into the json payload are not either an int or a boolean , which would cause a parsing exception.

Try this :

 <payloadFactory media-type="json">
            <format>{"statusCode":"$1","errorMessage":"$2","errors": "$3"}</format>
            <args>
                <arg evaluator="xml" expression="get-property('statusCode')/>
                <arg evaluator="xml" expression="get-property('errorMessage')/>
                <arg evaluator="xml" expression="get-property('errors')/>
            </args>
<payloadFactory>

To see what is happening in detail during mediation , try setting the synapse logger (org.apache.synapse) and wire log to DEBUG.