Can I run a java program developed using 32 bit jdk with 64 bit jre? application uses 32 bit non java system libraries

Question

I am developing a java application using 64 bit eclipse on a 64 bit Windows 7 install. I\'m forced to use a 32 bit JDK(1.7.0) because the application uses Jpcap, which wont comp

Answer 1

Will the application executable work on 64 bit platforms? assuming users will have the required x86 libraries installed (jpcap.dll/.so, WinPcap, libpcap) as 64 bit versions do not exist for the windows libs.

You will need to use a 32-bit JRE to run the application. A 64-bit Hotspot JRE cannot use 32-bit native libraries.

But the flipside is that it doesn't matter if you use a 64-bit or 32-bit Eclipse for developing and building ... provided that you configure Eclipse to launch a 32-bit JRE for any testing that involves the native libraries.

And to be clear, you can run a 32-bit JRE on a 64-bit OS platform, but not the other way around.

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UPDATE - apparently the jpcap.dll can be built for 64-bit Windows - see this posting: https://groups.google.com/forum/?fromgroups=#!topic/jpcap/-vxZv0eAcp4

Answer 2

From memory (and it's a little foggy) I'd so no.

Native libraries (at least under windows) need to be executed within the same bit beepthness as the JVM.

So, in order for you to be able to load your x32 bit libraries, you should be running within a x32 bit process (or x32 bit JVM)