Exception in xforms-server.xpl: URL generator found null URL for config

What could possibly cause the exception below?
It surfaces on an xforms save request, after the request has passed
through a proxy I wrote myself.

ERROR ProcessorService  - Exception at line 46, column 51 of
oxf:/ops/xforms/xforms-server.xpl (executing processor:
name='{http://www.orbeon.com/oxf/processors}url-generator')
org.orbeon.oxf.common.ValidationException: line 46, column 51 of
oxf:/ops/xforms/xforms-server.xpl (executing processor:
name='{http://www.orbeon.com/oxf/processors}url-generator'): URL
generator found null URL for config:
<config><url/></config>
oxf:/ops/xforms/xforms-server.xpl, line 46, column 51: URL generator
found null URL for config:
<config><url/></config>
        at
org.orbeon.oxf.processor.generator.URLGenerator$1$1.read(URLGenerator.java:334)
        at
org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsObject(ProcessorImpl.java:367)
        at
org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsObject(ProcessorImpl.java:332)
        at
org.orbeon.oxf.processor.generator.URLGenerator$1.readImpl(URLGenerator.java:310)
        at
org.orbeon.oxf.processor.impl.ProcessorOutputImpl$TopLevelOutputFilter.read(ProcessorOutputImpl.java:258)
        at
org.orbeon.oxf.processor.impl.ProcessorOutputImpl$ConcreteRuntimeOutputFilter$ForwarderRuntimeOutputOutput.read(ProcessorOutputImpl.java:219)
        at
org.orbeon.oxf.processor.ProcessorImpl.readInputAsSAX(ProcessorImpl.java:262)
        at
org.orbeon.oxf.processor.validation.MSVValidationProcessor$3.readImpl(MSVValidationProcessor.java:226)
        at
org.orbeon.oxf.processor.impl.ProcessorOutputImpl$TopLevelOutputFilter.read(ProcessorOutputImpl.java:258)
        at
org.orbeon.oxf.processor.impl.ProcessorOutputImpl.read(ProcessorOutputImpl.java:404)
        at
org.orbeon.oxf.processor.impl.ProcessorOutputImpl$ConcreteRuntimeOutputFilter.read(ProcessorOutputImpl.java:242)
        at
org.orbeon.oxf.processor.impl.ProcessorOutputImpl.read(ProcessorOutputImpl.java:404)


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On 06/20/2012 10:39 PM, Thomas Menke wrote:
> What could possibly cause the exception below?
> [stack trace]

oh ok, that's embarrassing: I was not forwarding the http request body
in my proxy. Sorry for that...

Thomas


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Phew ;) -Erik

On Wed, Jun 20, 2012 at 2:52 PM, Thomas Menke <[hidden email]> wrote:

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Hi Thomas,

This is exactly it. And this is an error that can be logged when Ajax requests are sent by the browser, and somehow the request is interrupted before the body makes it to Orbeon Forms, which can happen for a variety of reasons. It would be worthwhile to catch that special case in our code, and log a more meaningful error. I added the following RFE for this:

https://github.com/orbeon/orbeon-forms/issues/325

Alex