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https://issues.apache.org/jira/browse/CXF-7653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16371937#comment-16371937
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Neal Johnson commented on CXF-7653:
-----------------------------------
We're actually getting this NPE on a client site where we're not able to
actually verify the message itself. We were able to replicate it internally,
and found that when it replicated it was due to an empty SOAP body. The stack
trace is the same on the client site but it is worth mentioning that we haven't
been able to confirm the client is getting this from an empty body.
> Null pointer in JaxwsResponseCallback
> -------------------------------------
>
> Key: CXF-7653
> URL: https://issues.apache.org/jira/browse/CXF-7653
> Project: CXF
> Issue Type: Bug
> Components: JAX-WS Runtime
> Affects Versions: 3.0.10
> Environment: AIX
> Reporter: Neal Johnson
> Priority: Major
>
> Occasionally we'll get a null pointer in the JAXWS code.
> Caused by: java.lang.NullPointerException
> at
> org.apache.cxf.jaxws.JaxwsResponseCallback.get(JaxwsResponseCallback.java:49)
> When we receive a SOAP message with an empty body (example below) the
> (T)callback.get()[0] line in JaxwsResponseCallback throws a null pointer
> exception. We're still unsure why we're getting a message with an empty body
> in the first place, and if that's AIX related or we're just lucky in other
> operating systems.
> {{<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope";>}}
> {{ <soap:Header>}}
> {{ <!-- Stuff in here that I've removed. -->}}
> {{ </soap:Header>}}
> {{ <soap:Body />}}
> {{</soap:Envelope>}}
> We did some debugging and checked where our code diverged between the two
> types of messages. The below chunk of code is where it starts to unravel.
> {code:java|title=Code from within
> DocLiteralInInterceptor.java|borderStyle=solid}
> MessageContentsList parameters = new MessageContentsList();
> Exchange exchange = message.getExchange();
> BindingOperationInfo bop = exchange.getBindingOperationInfo();
> boolean client = isRequestor(message);
> //if body is empty and we have BindingOperationInfo, we do not need to match
> //operation anymore, just return
> if (bop != null && !StaxUtils.toNextElement(xmlReader)) {
> // body may be empty for partial response to decoupled request
> return;
> }
> ...
> // Lots of logic
> ...
> message.setContent(List.class, parameters);
> {code}
> ~~~~~~~
> When we do a StaxUtils.toNextElement that returns false, as it hits the end
> of the body immediately. This causes it to return without setting the
> MessageContentsList as a list on the message. Later, when the code tries to
> do a .getContent(List) it doesn't find anything, and this leads to it setting
> null as the first element returned on callback.get()[0].
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