Applets issue - 32bit browsers and 64bit JVM

Igor Nekrestyanov igor.nekrestyanov at
Thu Sep 20 15:43:59 PDT 2012

Hi Werner,
> On Windows basically all browsers are 32 bit. And yes, I am ignoring 
> IE 64bit and nightly builds of 64bit Firefox. If FX runtime and JRE 
> are both 32 bit there is obviously no problem. If FX and JRE are 64 
> bit though, will this work for a JNLP link in a 32bit browser? 
I believe association of javaws with files having JNLP extension will 
work. I.e. if you click on JNLP file link then in will launch webstart.

dtjava.js will NOT work as it will not be able to verify JavaFX is 
available and will offer to install it.
> Does this even depend on the deployment toolkit plugin in the browser, 
> or is it simply launching the javaws.exe associated with JNLP file 
> type, even if that javaws.exe belongs to a 64bit runtime?
It depends how you add the link to a webpage. If you use dtjava.js it 
depends on toolkit plugin.
If you simply link to a file in html page it will launch i think. (Note 
you need to have codebase in the JNLP file if you bypass DT)
> On Mac (10.8+) everything is 64bit anyway if I am not mistaken.
Chrome is not, is it?

> Thanks...
> Werner
> On 19.09.2012 15:29, Joe McGlynn wrote:
>> Hi Pedro,
>> This is certainly a problem we want to address.  It's not new, nor is
>> it even specific to FX applets/web start applications.  In the past
>> it hasn't been as big a problem as most 64 bit systems still had 32
>> bit browsers.
>> We believe we can address this by supplying a more universal "plugin"
>> that can launch the app using either a 32 bit of 64 bit JRE.  It's
>> significantly simpler for webstart, but theoretically possible for
>> applets as well.  Then users only have one JRE installed, and we can
>> launch the app regardless of which one they've installed.
>> There is a grey area that requires more thought -- what about
>> applications that depend on native code?  How can we make specifying
>> both platform-specific an chip arch-specific native extensions
>> practical?

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