Supporting JAXWS Provider's null response handling (the provider's invoke may
return a null to indicate no response should be sent back)
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Key: CXF-3926
URL: https://issues.apache.org/jira/browse/CXF-3926
Project: CXF
Issue Type: Improvement
Components: JAX-WS Runtime
Affects Versions: 2.4.4
Reporter: Aki Yoshida
Assignee: Aki Yoshida
Priority: Minor
Fix For: 2.4.5, 2.5.1
Jaxws 2.2 section 5.1.1 states:
"When an invoke method returns null, it is considered that no response needs to
be sent by service."
This use case assumes there is no information about the operation's MEP (no
wsdl, no java annotation).
CXF currently is throwing an exception in this case as it tries to serialize
the null object in its response (or outbound) chain processing.
21.11.2011 11:56:08 org.apache.cxf.phase.PhaseInterceptorChain doDefaultLogging
WARNUNG: Interceptor for
{http://server.any.test.tmp/}GreeterService#{http://server.any.test.tmp/}invoke
has thrown exception, unwinding now
java.lang.NullPointerException
at org.apache.cxf.staxutils.StaxUtils.copy(StaxUtils.java:418)
at
org.apache.cxf.databinding.source.XMLStreamDataWriter.write(XMLStreamDataWriter.java:88)
at
org.apache.cxf.databinding.source.XMLStreamDataWriter.write(XMLStreamDataWriter.java:50)
at
org.apache.cxf.databinding.source.XMLStreamDataWriter.write(XMLStreamDataWriter.java:46)
at
org.apache.cxf.interceptor.AbstractOutDatabindingInterceptor.writeParts(AbstractOutDatabindingInterceptor.java:119)
at
org.apache.cxf.interceptor.BareOutInterceptor.handleMessage(BareOutInterceptor.java:68)
...
To support the behavior given by the above paragraph, we need to handle this
condition, whether a provider based service is returning a null, and if so,
return no response content (i.e, HTTP 202 with no content) instead of throwing
an exception and returning a SOAP fault.
To be compatible with the old behavior (i.e, throwing an exception), we can
introduce a runtime property to enable or disable this provider's null response
behavior.
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