Manuel Shenavai created CXF-9091:
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             Summary: Camel 3|CXF: ParsingErrors with OneWay Messages
                 Key: CXF-9091
                 URL: https://issues.apache.org/jira/browse/CXF-9091
             Project: CXF
          Issue Type: Bug
            Reporter: Manuel Shenavai


Hi everyone,

we recently moved from Camel 2 to Camel 3 and we are now observing the 
following problem with CXF. If a OneWay message exceeds a certain length, the 
messages fail with a parser error like:

Caused by: java.lang.IllegalStateException: Current event not START_ELEMENT or 
END_ELEMENT
at 
com.ctc.wstx.sr.BasicStreamReader.getNamespaceCount(BasicStreamReader.java:805) 
~[woodstox-core-6.2.7.jar:6.2.7]
at 
org.apache.cxf.staxutils.DepthXMLStreamReader.getNamespaceCount(DepthXMLStreamReader.java:122)
 ~[cxf-core-3.5.2.jar:3.5.2]
at 
org.apache.cxf.staxutils.DepthXMLStreamReader.getNamespaceCount(DepthXMLStreamReader.java:122)
 ~[cxf-core-3.5.2.jar:3.5.2]
at 
org.apache.camel.component.cxf.converter.DelegatingXMLStreamReader.<init>(DelegatingXMLStreamReader.java:40)
 ~[camel-cxf-3.17.0.jar:3.17.0]
at 
org.apache.camel.component.cxf.converter.CxfPayloadConverter.convertTo(CxfPayloadConverter.java:225)
 ~[camel-cxf-3.17.0.jar:3.17.0]
at 
org.apache.camel.component.cxf.converter.CxfPayloadConverterLoader.lambda$registerFallbackConverters$8(CxfPayloadConverterLoader.java:68)
 ~[camel-cxf-3.17.0.jar:3.17.0]
at 
org.apache.camel.support.SimpleTypeConverter.convertTo(SimpleTypeConverter.java:101)
 ~[camel-support-3.17.0.jar:3.17.0]
... 30 common frames omitted

The error will not happen if we reduce the length of the message or if we 
change it from OneWay to ResponseReply. This indicates a problem in the async 
decoupling of the request.

During debugging I found that the HTTP thread is used to handle the request. 
But the actual processing of the message happens in new thread. Maybe the input 
stream is closed after the http thread is finished (HTTP 202) and the spawned 
thread cannot read the full content anymore.

I created the following reproducer based on Spring Boot: 
[https://github.com/mash-sap/cxfOneWayError/tree/main]
CXF: 3.6.5
Camel CXF: 3.17.0
Tomcat: 9.0.83



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