[MacRuby-devel] WebView History / Exception handling

Brad Wilson brad at lucky-dip.net
Sun Oct 26 16:33:45 PDT 2008

For the record, this problem seems to have been fixed by upgrading to  
MacRuby trunk. I no longer get the exception with the pre0.4 build.

On 21/10/2008, at 4:59 PM, Brad Wilson wrote:

> Hi,
> I'm trying to do a little web browser in MacRuby. It's coming along
> nicely, but I'm having a strange problem with history.
> I set up a WebView and it loads, I go to a few urls, then call the
> back action on the WebView.
> The first time I do this, I get the error below and get dumped to gdb.
> Terminating app due to uncaught exception 'WebKitThreadingException',
> reason: 'void -[WebHistoryItem finalize](WebHistoryItem*,
> objc_selector*) was called from a secondary thread'
> If I type quit in gdb, it detaches from the debugger and continues.
> From that point I can call goBack and goForward and they work fine.
> Now I guess I've got two ways out of this:
> 1. Figure out why WebHistoryItem.finalize is being called from another
> thread, or
> 2. Add some kind of exception handling to catch this error and ignore
> it.
> I haven't really had any luck with 1, so I tried 2 (using http://www.macdevcenter.com/pub/a/mac/2007/07/31/understanding-exceptions-and-handlers-in-cocoa.html?page=7)
>  but I couldn't get it working in MacRuby.
> Can anybody point me to a way to catch uncaught exceptions in a
> MacRuby program?
> Thanks,
> Brad
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