Ok. Finally I've found the sneaky bug.
The code was failing actually later in the code where was another eval
function referencing the obj variable eval('var title =
obj.feed.entry[' + i + '].title');
Then I checked the obfuscated code and I realized that the obj
variable gets obfuscated and renamed!
Here is how to fix it:
http://code.google.com/webtoolkit/doc/1.6/FAQ_Client.html#Help!_I'm_having_problems_with_eval()_in_my_JSNI_method!
Eval function is really evil, so be careful using it in the JSNI code.
I've spent a lot of time with figuring out what caused the problem,
but lesson learned ;o)
On Nov 18, 11:50 am, jogo <[email protected]> wrote:
> Hi Gal, thank you for sharing the gwt ant build script.
>
> The script wasn't the problem, I was able to compile the source with
> the default ant build script. The problem was that compiled code from
> Eclipse worked but from command line didn't.
>
> Today I made some other tests and I finally I identified the problem.
>
> I compiled the source code in Eclipse using DETAILED, PRETTY and
> OBFUSCATED output. And I did the same with the ant script. Then I
> compared them.
>
> I was hoping to see some differences in Eclipse generated code and in
> command line, but to my surprise all generated files were binary
> identical! => it was not problem of compiling.
>
> Then I deployed to the test environment each version. OBFUSCATED
> version failed with error. But, when I deployed PRETTY and DETAILED
> versions the code worked!
>
> So it also explains, why I wasn't getting errors from Eclipse build,
> because output might have been set to PRETTY / DETAILED. Ant script by
> default produces obfuscated code.
>
> Here is a code snippet from the native method, that fails:
>
> public static native String parseJSON(String json) /*-{
> var retval = [];
>
> try {
> var x = 0;
>
> if (json != null) {
> var obj = eval( '(' + json + ')' ); <---- HERE IT
> FAILS
> var entries = obj.feed.entry;
>
> I was getting error 'Can't find variable obj'.
>
> I've replaced the eval function with JSON.parse method
> (http://www.json.org/js.html) and included json2.js file in the entry html
> file, but it is still the same. Obfuscated version doesn't work and
> I'm getting the same error 'Can't find variable obj' while detailed
> version works.
>
> Any ideas?
>
> On Nov 17, 4:08 am, Gal Dolber <[email protected]> wrote:
>
>
>
>
>
>
>
> > I'm compiling projects using gwt trunk from ant without problem
>
> > this is my base ant scripthttp://pastebin.com/prRQEETz
>
> > and this is how I extend it for each projecthttp://pastebin.com/t7RLmd29
>
> > the script asume you are using lombok and it support annotation processors,
> > but you should be able to extract the gwt compilation part.
>
> > Hope it helps
>
> > On Wed, Nov 16, 2011 at 4:48 PM, jogo <[email protected]> wrote:
> > > Hi,
>
> > > I'm getting really frustrated from this, so any advice is highly
> > > appreciated.
>
> > > In my GWT project, there is a java native method that calls eval
> > > function inside. All worked fine till I updated from 2.3.0 to 2.4.0
> > > (on Windows XP in Eclipse). After that, when I compiled the project in
> > > Eclipse (GWT 2.4.0) the native method stopped working and I spent
> > > quite a lot of time figuring out what was the cause of this problem.
>
> > > It turned out, that the update form 2.3.0 to 2.4.0 caused it. Then I
> > > downgraded back to GWT SDK 2.3.0, re-configured Eclipse and then again
> > > all worked fine.
>
> > > Today I created a simple ant build script (generated from
> > > webAppCreator app using SDK 2.3.0) and used it. And again, the problem
> > > re-surfaced, the native method doesn't work! The ant script uses SDK
> > > 2.3.0.
>
> > > The surprising thing is, that when I compile the project from Eclipse
> > > with SDK 2.3.0 all works fine. When I compile the project from command
> > > line using the same SDK and JRE compiled code is different and doesn't
> > > work.
>
> > > Any idea where the problem might be? Thanks.
>
> > > --
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>
> > --
> > Guit: Elegant, beautiful, modular and *production ready* gwt applications.
>
> >http://code.google.com/p/guit/
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