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  64bit jdk applications can be run on 32bit jres?  (Read 1564 times)
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Offline emzic

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« Posted 2008-04-19 10:19:22 »

hello,

if i use sun's 64bit jdk, will the applications i build with it only be runnable on 64bit jres or will they run on the more widely spread 32bit jres as well?

speaking of 64bit. if i am not mistaken, there is no javaws.exe shipping with suns 64bit jre. does anyone know of a way to still get webstart (jnlp) running on 64bit?

thanks!

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Offline erikd

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« Reply #1 - Posted 2008-04-19 11:14:57 »

Quote
will they run on the more widely spread 32bit jres as well?

Of course! It's only the VM that's 64bit, the byte code is platform independent. WORA, remember?  Smiley

Offline emzic

Senior Duke





« Reply #2 - Posted 2008-04-19 13:29:01 »

thanks! but then why do some java software explicitly require a 64bit jvm to run?

example: eclipse
http://download.eclipse.org/eclipse/downloads/drops/S-3.4M6a-200804091425/download.php?dropFile=eclipse-SDK-3.4M6a-win32-x86_64.zip

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Offline Riven
« League of Dukes »

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« Reply #3 - Posted 2008-04-19 14:00:45 »

It relies on native libraries (like SWT)

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Offline emzic

Senior Duke





« Reply #4 - Posted 2008-04-19 14:10:57 »

ok, thanks!

but what do natives have to do with the JVM then? i thought they are executed by the OS (which of course has to be 64bit) itself and not by the VM.

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Offline erikd

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« Reply #5 - Posted 2008-04-20 10:42:18 »

ok, thanks!

but what do natives have to do with the JVM then? i thought they are executed by the OS (which of course has to be 64bit) itself and not by the VM.

The native .dll is called by the JVM through JNI. I could imagine that calling a 64bit native from a 32bit JVM won't work.

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