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https://issues.apache.org/jira/browse/CXF-3926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Kulp resolved CXF-3926.
------------------------------
Resolution: Fixed
> Supporting JAXWS Provider's null response handling (the provider's invoke may
> return a null to indicate no response should be sent back)
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> 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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