Re: calling java from a javascript XPCOM component

From: Andrew Harrison <>
Date: Tue, 18 Oct 2005 08:40:03 +0100

Hi Stefano,

Many thanks for your help on this. I looked at those two files, but
will make a deeper investigation.

thanks again,


On 17 Oct 2005, at 23:25, Stefano Mazzocchi wrote:

> Andrew Harrison wrote:
>> Hi,
>> This is really a general question. Piggybank seems to be able to
>> create Java object from within a Javascript component. Could anyone
>> explain how this was achieved? I've got LiveConnect working in the
>> JavaScript on an html page, but when I try the same thing from within
>> a component it doesn't work. So somehow I need to tell Firefox to
>> use the LiveConnect when it's loading the component, but I can't work
>> out how.
>> Any help appreciated.
>> cheers,
>> Andrew
>> PS - I'm on a Mac - but like I say, I've got the LiveConnect working
>> in an html page.
> Andrew,
> the xpconnect subsystem (the one that wraps XPCOM) is *not* conneced
> to LiveConnect, so you have to pass the "java" object from an actual
> web page to "enable" it.
> Look into nsPiggyBank.js and nsClassLoader.js, those are the files
> that control the whole system. nsClassLoader especially contains a lot
> of the black magic of classloading and policy settings that you need
> to enable the JVM integration.
> We should write a "how to write xpcom components in java" howto, but
> boy, so much work to do :-/
> --
> Stefano Mazzocchi
> Research Scientist Digital Libraries Research Group
> Massachusetts Institute of Technology location: E25-131C
> 77 Massachusetts Ave telephone: +1 (617) 253-1096
> Cambridge, MA 02139-4307 email: stefanom at mit . edu
> -------------------------------------------------------------------
Received on Tue Oct 18 2005 - 07:30:53 EDT

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