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Re: Problem with faults and classloaders in AS7
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created by <a href="http://community.jboss.org/people/adinn">Andrew Dinn</a> in <i>JBoss Web Services Development</i> - <a href="http://community.jboss.org/message/608493#608493">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote"><p>Alessio Soldano wrote:</p><blockquote class="jive-quote"><p>Andrew Dinn wrote:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I found another glitch in the XTS interop demo which is als a package problem but it was masked by not seeing an exception on the client side. The interop tests creates a JaxWS proxy for the test Participant service which drives XTS and then asks it to run a test. In some cases it passes transaction details using a handler to serialise them into the message. My handler was failing with an NPE but the client proxy did not receive any exception. Is this normal behaviour?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p></blockquote><p>I don't think so, but I'd probably need to see more details / the code to better understand.</p></blockquote><p>Nothing much to see. It's a classic "I'll fix this later cock-up". Here's the code.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">    <font color="navy"><b>public</b></font> <font color="navy"><b>boolean</b></font> handleMessage(SOAPMessageContext context) <font color="navy"><b>throws</b></font> ProtocolException
    <font color="navy">{</font>
        <font color="navy"><b>final</b></font> <font color="navy"><b>boolean</b></font> outbound = (Boolean)context.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY);
        <font color="navy"><b>if</b></font> (outbound) <font color="navy">{</font>
            <font color="navy"><b>return</b></font> handleMessageOutbound(context);
        <font color="navy">}</font> <font color="navy"><b>else</b></font> <font color="navy">{</font>
            <font color="navy"><b>return</b></font> handlemessageInbound(context);
        <font color="navy">}</font>
    <font color="navy">}</font>
 
    <font color="navy"><b>protected</b></font> <font color="navy"><b>boolean</b></font> handleMessageOutbound(SOAPMessageContext context) <font color="navy"><b>throws</b></font> ProtocolException
    <font color="navy">{</font>
        <font color="navy"><b>try</b></font> <font color="navy">{</font>
            CoordinationContextType coordinationContext = CoordinationContextManager.getThreadContext();
            <font color="navy"><b>if</b></font> (coordinationContext != <font color="navy"><b>null</b></font>) <font color="navy">{</font>
                <font color="navy"><b>final</b></font> JAXBContext jaxbCtx = getJaxbContext();
 
                <font color="darkgreen">// insert a header into the current message containing the coordination context</font>
                <font color="navy"><b>final</b></font> SOAPMessage soapMessage = context.getMessage();
                <font color="navy"><b>final</b></font> SOAPEnvelope soapEnvelope = soapMessage.getSOAPPart().getEnvelope();
                SOAPHeader soapHeader = soapEnvelope.getHeader() ;
                <font color="navy"><b>if</b></font> (soapHeader == <font color="navy"><b>null</b></font>)
                <font color="navy">{</font>
                    soapHeader = soapEnvelope.addHeader() ;
                <font color="navy">}</font>
                . . .
                SOAPHeaderElement headerElement = soapHeader.addHeaderElement(getDummyQName());
                Marshaller marshaller = jaxbCtx.createMarshaller();
                marshaller.marshal(coordinationContext, headerElement);
                . . .
            <font color="navy">}</font>
 
        <font color="navy">}</font> <font color="navy"><b>catch</b></font> (Exception se) <font color="navy">{</font>
            <font color="navy"><b>throw</b></font> <font color="navy"><b>new</b></font> ProtocolException(se);
        <font color="navy">}</font>
 
        <font color="navy"><b>return</b></font> <font color="navy"><b>true</b></font>;
    <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and here's the code which returns the null pointer</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">    <font color="navy"><b>private</b></font> <font color="navy"><b>static</b></font> JAXBContext jaxbContext;
    <font color="navy"><b>private</b></font> <font color="navy"><b>synchronized</b></font> JAXBContext getJaxbContext()
    <font color="navy">{</font>
        <font color="navy"><b>if</b></font> (jaxbContext == <font color="navy"><b>null</b></font>) <font color="navy">{</font>
            <font color="navy"><b>try</b></font> <font color="navy">{</font>
                jaxbContext = JAXBContext.newInstance(<font color="red">"org.oasis_open.docs.ws_tx.wscoor._2006._06"</font>);
            <font color="navy">}</font> <font color="navy"><b>catch</b></font> (JAXBException e) <font color="navy">{</font>
                <font color="darkgreen">// TODO log error here</font>
            <font color="navy">}</font>
        <font color="navy">}</font>
 
        <font color="navy"><b>return</b></font> jaxbContext;
    <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I would have expected the ProtocolException to have resulted in an exception thrown from the client proxy method invocation but the proxy call just returned normally.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Once again the classloader used to resollve the load under JAXBContext.newInstance was the war classloader. I worked round this by adding 'com.sun.xml.bind services export' to the dependencies in the war manifest.mf. However, I think it would be better if the modules which import it (both jaxws-client and jbossws-cxf-client) also exported it. It might be good if all the dependencies weer scrutinised to see whether they need re-exporting.</p></div>
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<p style="margin: 0;">Start a new discussion in JBoss Web Services Development at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2047">Community</a></p>
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