Bad news, apparently half of the patch I submitted never made it in.
hessian 4.0.3 is broken on GAE - and even worse, it only shows up on
the live server.
If you feel daring, apply this two-line patch to Resin trunk and run
"ant". The hessian.jar built into /lib works for me.
With any luck this will finally be working in hessian 4.0.4...
Jeff
Index: modules/hessian/src/com/caucho/hessian/io/ContextSerializerFactory.java
===================================================================
--- modules/hessian/src/com/caucho/hessian/io/ContextSerializerFactory.java
(revision
6698)
+++ modules/hessian/src/com/caucho/hessian/io/ContextSerializerFactory.java
(working
copy)
@@ -321,6 +321,10 @@
HashMap<Class,Class> classMap,
Class type)
{
+ // On GAE, the call to getSystemClassLoader() will fail and this will
be null
+ if (getClassLoader() == null)
+ return;
+
try {
Enumeration iter;
On Fri, Jan 29, 2010 at 12:26 PM, Jeff Schnitzer <j...@infohazard.org> wrote:
> The fix went into version 4.0.3, which is actually available for
> download but the link is missing from the download page. I told
> Caucho about the problem, but in the mean time here's a (manually
> constructed) download link:
>
> http://caucho.com/download/hessian-4.0.3.jar
>
> I notice that the code has changed a bit since I submitted my patch
> but my initial tests show that it works with appengine. I'm updating
> the jar of my production system now and I'll scream if it doesn't
> work.
>
> At any rate, this version should work according to the docs. Here's a
> very simple appengine test project that makes a hessian call to a
> hessian service:
>
> http://scratchmonkey.googlecode.com/svn/appengine/hessian
>
> Jeff
>
> On Fri, Jan 29, 2010 at 8:48 AM, Pravesh <pravesh.ve...@gmail.com> wrote:
>> Hi Jeff,
>>
>> First of all thanks a lot for your reply. I tried looking into the
>> Hessian but I am still confused on one point that how can I use the
>> Hessian Client on Google App Engine. Is their any kind of document or
>> pointer which can help me in understanding how I can use Hessian with
>> Google Data Store.
>>
>> Please note that my basic and only requirement is to expose the data
>> which is in Google data Store to a 3rd party tools. I tried creating a
>> webservice but it gives me a build error saying that Google run time
>> will give me error.
>>
>> Please let me know how I can use Hessian with Google App engine in
>> that case.
>>
>> If you need any further information on this, please let me know.
>>
>> Thanks and Regards
>> Pravesh
>>
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>
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