I’ve been spending days on this. I kept getting messages that the socket to the app was being closed, and I couldn’t find out why.

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[2007-02-08 14:13:40 PST] <workerthread7> <wohttpio>: Unable to set socket timeout:Socket is closed  
&lt;/wohttpio&gt;&lt;/workerthread7&gt;

Turns out that by calling

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com.google.checkout.sample.protocol.CallBackParser.getInstance().parseToJAXB(new InputSource(aRequest.contentInputStream()))

either jaxb, the xml parser, or the google code was closing the input stream returned by the request, which was closing the socket to the web server. Instead, I changed the code to

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com.google.checkout.sample.protocol.CallBackParser.getInstance().parseToJAXB(new InputSource(new java.io.StringReader(aRequest.contentString())))

and it works fine.

I figured I’d post this note so that if someone else runs into this problem, they’d hopefully find a solution via a Google search.