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From Deepal Jayasinghe <>
Subject Re: Custom handler for header with mustUnderstand=true
Date Sat, 16 Oct 2010 03:32:53 GMT

On 10/15/2010 9:50 AM, Stephanos Piperoglou wrote:
> Hi everyone,
> I'm trying to use Axis2 to build a client that communicates with a
> third-party web service that uses a proprietary authentication
> mechanism involving a SOAP header. It works like this:
> 1. You call a login() method in the usual way (no extra headers) and
> the SOAP envelope in the response contains a header (with
> mustUnderstand="true") with an authentication token
> 2. Subsequent request need to contain this token in an authentication
> header
> I've created an ADB stub using wsdl2java and (after a bit of tinkering
> to set Expect: 100-continue HTTP header) I am able to call the login()
> method but the client chokes on the header in the response:
> Exception in thread "Main Thread" _java.lang.NullPointerException_
>         at
> org.apache.axis2.engine.AxisEngine.checkMustUnderstand(
>         at
> org.apache.axis2.engine.AxisEngine.receive(
>         at
> org.apache.axis2.description.OutInAxisOperationClient.handleResponse(
>         at
> org.apache.axis2.description.OutInAxisOperationClient.send(
>         at
> org.apache.axis2.description.OutInAxisOperationClient.executeImpl(
>         at
> org.apache.axis2.client.OperationClient.execute(
>         at
> com.db.pvsax.idssoap.MarketDataServiceStub.loginXML(
>         at com.db.pvsax.idssoap.IdsSample.main(
> From what I can gather I need to write a module with a handler that
> will deal with this error. I wrote a Module and a Handler class,
> created module.xml, packaged them all into a .mar file put that and an
> axis2.xml (with references to the module and the new phases) in the
> classpath but nothing seems to be changing.
> Questions for you fine people:
> 1. How can I figure out why my handler isn't being invoked? Is it
> enough to put axis2.xml in the classpath? Any way to confirm (e.g. via
> debug logging) that the module is being loaded?
This is not enough, if you change the default axis2.xml, then you need
to create your stub with that axis2.xml. Create a configurationContext
by pointing to your axis2.xml and the create the stub using that
configuration context.
> 2. How can my handler tell Axis that it understood the mustUnderstand
> header to prevent the NPE above?
Once you process the soap header, you can set the processed flag to true.
> 3. How can I configure the handler to only be used with this
> particular web service and not the others I access from the same
> system that don't have this authentication system? axis2.xml seems to
> be a global config that would break everything else.
If there is a name space or something in the header then you can use
that as a way of telling your handle. Another option is to configure it
to use the URL based filtering.
> Regards,
> Stephanos Piperoglou
> Price Control
> +44 20 754 59007
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