Incorrect Mediation Sequence Generated for APIs Created through the SOAP to REST

[Sumudu-Sahan]

Description

When generating a REST API through the SOAP WSDL file, it generates an incorrect mediation sequence, and hence, this leads to return message building errors when invoking API resources.

Steps to Reproduce

• Start the API Manager and go to the publisher portal.
• Create a SOAP to REST API by using the attached WSDL file.

minimal_wsdl.wsdl.zip

• Publish the API.
• Invoke it and able to see the below stack trace.

TID: [] [] [2025-11-17 12:27:59,014] ERROR {org.apache.synapse.mediators.base.SequenceMediator} - {api:WSDL2:v2} javax.xml.stream.XMLStreamException: org.apache.axiom.om.OMException: com.ctc.wstx.exc.WstxParsingException: Unexpected close tag </web:string>; expected </web:sampleAttribute>.
 at [row,col {unknown-source}]: [1,266] org.apache.axiom.om.OMException: javax.xml.stream.XMLStreamException: org.apache.axiom.om.OMException: com.ctc.wstx.exc.WstxParsingException: Unexpected close tag </web:string>; expected </web:sampleAttribute>.
 at [row,col {unknown-source}]: [1,266]
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296)
	at org.apache.axiom.om.impl.llom.OMSerializableImpl.build(OMSerializableImpl.java:78)
	at org.apache.axiom.om.impl.llom.OMElementImpl.build(OMElementImpl.java:722)
	at org.apache.axiom.om.impl.llom.OMElementImpl.buildWithAttachments(OMElementImpl.java:1086)
	at org.apache.synapse.mediators.transform.PayloadFactoryMediator.checkAndReplaceEnvelope(PayloadFactoryMediator.java:260)
	at org.apache.synapse.mediators.transform.PayloadFactoryMediator.mediate(PayloadFactoryMediator.java:128)
	at org.apache.synapse.mediators.transform.PayloadFactoryMediator.mediate(PayloadFactoryMediator.java:103)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:126)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:74)
	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:476)
	at org.apache.synapse.api.AbstractApiHandler.apiProcessNonDefaultStrategy(AbstractApiHandler.java:108)
	at org.apache.synapse.api.AbstractApiHandler.identifyAPI(AbstractApiHandler.java:128)
	at org.apache.synapse.api.AbstractApiHandler.dispatchToAPI(AbstractApiHandler.java:60)
	at org.apache.synapse.api.rest.RestRequestHandler.dispatchToAPI(RestRequestHandler.java:90)
	at org.apache.synapse.api.rest.RestRequestHandler.process(RestRequestHandler.java:76)
	at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:54)
	at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:352)
	at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:101)
	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
	at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:399)
	at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:458)
	at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:206)
	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: javax.xml.stream.XMLStreamException: org.apache.axiom.om.OMException: com.ctc.wstx.exc.WstxParsingException: Unexpected close tag </web:string>; expected </web:sampleAttribute>.
 at [row,col {unknown-source}]: [1,266]
	at org.apache.axiom.om.impl.SwitchingWrapper.updateLastNode(SwitchingWrapper.java:1192)
	at org.apache.axiom.om.impl.SwitchingWrapper.next(SwitchingWrapper.java:1127)
	at java.xml/javax.xml.stream.util.StreamReaderDelegate.next(StreamReaderDelegate.java:84)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.parserNext(StAXOMBuilder.java:681)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:214)
	... 27 more
Caused by: org.apache.axiom.om.OMException: com.ctc.wstx.exc.WstxParsingException: Unexpected close tag </web:string>; expected </web:sampleAttribute>.
 at [row,col {unknown-source}]: [1,266]
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296)
	at org.apache.axiom.om.impl.SwitchingWrapper.updateNextNode(SwitchingWrapper.java:1210)
	at org.apache.axiom.om.impl.SwitchingWrapper.updateLastNode(SwitchingWrapper.java:1190)
	... 31 more
Caused by: com.ctc.wstx.exc.WstxParsingException: Unexpected close tag </web:string>; expected </web:sampleAttribute>.
 at [row,col {unknown-source}]: [1,266]
	at com.ctc.wstx.sr.StreamScanner.constructWfcException(StreamScanner.java:606)
	at com.ctc.wstx.sr.StreamScanner.throwParseError(StreamScanner.java:479)
	at com.ctc.wstx.sr.StreamScanner.throwParseError(StreamScanner.java:464)
	at com.ctc.wstx.sr.BasicStreamReader.reportWrongEndElem(BasicStreamReader.java:3283)
	at com.ctc.wstx.sr.BasicStreamReader.readEndElem(BasicStreamReader.java:3210)
	at com.ctc.wstx.sr.BasicStreamReader.nextFromTree(BasicStreamReader.java:2829)
	at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1072)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.parserNext(StAXOMBuilder.java:681)
	at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:214)
	... 33 more

Version

4.2.0

Environment Details (with versions)

No response