[APIM-4.0.0] Message Building scenario Upon Enabling OAuth2 Endpoint Security

[JanithaSampathBandara]

Description

The backend response gets built upon enabling OAuth2 Endpoint Security for the endpoint. In the out sequence, <class name="org.wso2.carbon.apimgt.gateway.mediators.oauth.OAuthResponseMediator"/> is getting engaged and this is responsible to build the response flow payload.

Steps to Reproduce

1. Setup a mock backend to send image/png payload(payload with any content type a formatter is not set in APIM/ with an invalid payload)
2. Deploy an API setting the created backend as the endpoint.
3. Enable OAuth2 Endpoint Security for endpoint and invoke the API.

Upon invoking, the below error can be observed;

ERROR {org.apache.synapse.transport.passthru.util.RelayUtils} - Error while building Passthrough stream org.apache.axiom.om.OMException: com.ctc.wstx.exc.WstxIOException: Invalid UTF-8 start byte 0x89 (at char #1, byte #-1)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296)
	at org.apache.axiom.om.impl.llom.OMDocumentImpl.getOMDocumentElement(OMDocumentImpl.java:109)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.getDocumentElement(StAXOMBuilder.java:570)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.getDocumentElement(StAXOMBuilder.java:566)
	at org.apache.synapse.transport.passthru.util.DeferredMessageBuilder.getDocument(DeferredMessageBuilder.java:165)
	at org.apache.synapse.transport.passthru.util.RelayUtils.buildMessage(RelayUtils.java:172)
	at org.apache.synapse.transport.passthru.util.RelayUtils.buildMessage(RelayUtils.java:125)
	at org.apache.synapse.mediators.AbstractListMediator.buildMessage(AbstractListMediator.java:152)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:95)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
	at org.apache.synapse.config.xml.AnonymousListMediator.mediate(AnonymousListMediator.java:37)
	at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:205)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:109)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
	at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
	at org.apache.synapse.api.Resource.process(Resource.java:342)
	at org.apache.synapse.api.API.process(API.java:402)
	at org.apache.synapse.api.AbstractApiHandler.apiProcessNonDefaultStrategy(AbstractApiHandler.java:109)
	at org.apache.synapse.api.AbstractApiHandler.identifyAPI(AbstractApiHandler.java:129)
	at org.apache.synapse.api.AbstractApiHandler.dispatchToAPI(AbstractApiHandler.java:54)
	at org.apache.synapse.api.rest.RestRequestHandler.dispatchToAPI(RestRequestHandler.java:84)
	at org.apache.synapse.api.rest.RestRequestHandler.process(RestRequestHandler.java:57)
	at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:54)
	at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:344)
	at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:610)
	at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:206)
	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
	at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:338)
	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.ctc.wstx.exc.WstxIOException: Invalid UTF-8 start byte 0x89 (at char #1, byte #-1)
	at com.ctc.wstx.sr.StreamScanner.constructFromIOE(StreamScanner.java:625)
	at com.ctc.wstx.sr.StreamScanner.loadMore(StreamScanner.java:997)
	at com.ctc.wstx.sr.StreamScanner.getNext(StreamScanner.java:754)
	at com.ctc.wstx.sr.BasicStreamReader.nextFromProlog(BasicStreamReader.java:2000)
	at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1134)
	at org.apache.axiom.util.stax.wrapper.XMLStreamReaderWrapper.next(XMLStreamReaderWrapper.java:225)
	at org.apache.axiom.util.stax.dialect.DisallowDoctypeDeclStreamReaderWrapper.next(DisallowDoctypeDeclStreamReaderWrapper.java:34)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.parserNext(StAXOMBuilder.java:681)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:214)
	... 31 more
Caused by: java.io.CharConversionException: Invalid UTF-8 start byte 0x89 (at char #1, byte #-1)
	at com.ctc.wstx.io.UTF8Reader.reportInvalidInitial(UTF8Reader.java:303)
	at com.ctc.wstx.io.UTF8Reader.read(UTF8Reader.java:189)
	at com.ctc.wstx.io.ReaderSource.readInto(ReaderSource.java:87)
	at com.ctc.wstx.io.BranchingReaderSource.readInto(BranchingReaderSource.java:57)
	at com.ctc.wstx.sr.StreamScanner.loadMore(StreamScanner.java:991)
	... 38 more

Version

APIM 4.0.0.323

Environment Details (with versions)

No response