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From Patrick Verkaik <patr...@cs.vu.nl>
Subject exception handling
Date Tue, 13 Jan 2004 16:53:50 GMT

Hello, I have a question that I hope someone can help me with..


I am deploying a class that contains methods that can throw exceptions.
Whenever an exception is thrown, my client receives a '(500)Internal
Server Error'. The following appears in the tomcat log file:



2004-01-13 17:31:23 StandardWrapperValve[rpcrouter]: Servlet.service() for
servlet rpcrouter threw exception
javax.servlet.ServletException: Error building response envelope:
java.lang.NullPointerException
        at
org.apache.soap.server.http.RPCRouterServlet.doPost(RPCRouterServlet.java:418)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

(etc)



I have deployed using the following descriptor:

<!-- generated by vu.globe.svcs.gloap.apache.GenGloapDeployDescriptor -->
<isd:service xmlns:isd='http://xml.apache.org/xml-soap/deployment'
             id='http://gloap.gdn.apps.gaia.vu'>
  <isd:provider type='java'
                scope='Session'
                methods='bind getFileTraceInfo'>
    <isd:java class='vu.gaia.apps.gdn.gloap.PackageGloapSession' static='false'/>
  </isd:provider>

  <isd:faultListener>org.apache.soap.server.DOMFaultListener
  </isd:faultListener>
  <isd:mappings>
    <isd:map
       encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'
       xmlns:x='http://gdn.apps.gaia.vu' qname='x:getFileTraceInfoResults'
       javaType='vu.gaia.apps.gdn.getFileTraceInfoResults'
       java2XMLClassName='org.apache.soap.encoding.soapenc.BeanSerializer'
       xml2JavaClassName='org.apache.soap.encoding.soapenc.BeanSerializer'
     />
  </isd:mappings>
</isd:service>

On the server side I am using Apache Soap 2.3.1, Tomcat 5.0.16, Xerces
1.4.4. My client is using Axis 1.1.

I have tried throwing RemoteException, a subclass of RemoteException, and
'Exception'. The same happens in each case. The deployed class works fine
as long as no exceptions are thrown.

	Help would be much appreciated..

	Patrick

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