Most things in that patch look ok. I'd like to do a more thorough analysis of the implications of each change though.

The catching of SecurityException is fine, but I want to look at the places where they drop the exceptions that they caught in their context, and make sure that silently ignoring the exception is a valid approach. The other changes are few but slightly more controversial.

Are Google willing to sign a contributors agreement and license this patch to us? otherwise someone who has not looked on it yet (i.e. not me), should probably experiment with Jython on GAE and find out what needs to be patched to get Jython to run there.


On Wed, Apr 8, 2009 at 2:37 PM, Alan Kennedy <> wrote:
Hi all,

As you may know, Google announced Java for AppEngine yesterday!

And they're also supporting all of the various languages that run on
the JVM, including jython.

They say about jython

- Jython 2.2 works out of the box.
- Jython 2.5 requires patches which we'll supply until the changes
make it directly into Jython:
 - jython-r5996-patched-for-appengine.jar is the complete jython
binary library, patched for app engine
 - jython-r5996-appengine.patch is the patch file that contains the
source code for the changes

They provide the patches they used to make 2.5 work

I definitely think this is an important patch to consider for the 2.5RC!

It would be nice if Google could say Jython 2.2 works out of the box,
and jython 2.5 works out of the box.


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