CODEWITHSUNDEEP
javaeclipsejvm
Reid
Reid

Reputation: 4534

Make jar run in 32bit jre

How can I specify that in order to run a certain java application that I created you need to have 32 bit JRE installed on your system? Further how can I specify that the java application is to use the 32 bit JRE and not the 64 bit JRE if they are both installed?

Background:

I have created an application that uses a 3rd party 32 bit only library. The application can not run in a 64 bit JRE.

I am going to be distributing this application to a lot of computers in my company, so I need to be able to in code or in the export process, specify the required JRE.

I am using eclipse, Kepler to develop and build the java application.

Upvotes: 4

Views: 1171

Answers (3)

Ingo
Ingo

Reputation: 36339

You cannot generally make sure what program runs your jar. I can pass the jar to acroread, or zip or whatever, and you can't do anything about it.

So, I'd just try to load the library, and do a proper error/exception handling. Who knows? Maybe your client has meanwhile replaced that library with a 64bit version, without you knowing about it? SO, this: loading, and if it won't aborting with a graceful eror message is the only sensible thing.

Upvotes: 0

Elliott Frisch
Elliott Frisch

Reputation: 201439

You can't do it directly in Java, since you're in a running JVM at that point. My solution was to write a dos batch script to set the JAVA_HOME and add %JAVA_HOME%\bin at the front of the PATH. For example, I have sethome.bat which contains

@echo off
set "JAVA_HOME=c:\Program Files (x86)\Java\jre6"
set "PATH=%JAVA_HOME%\bin;%PATH%"

Then I use

call "%SERVICE_HOME%\sethome"
"%JAVA_HOME%\bin\java" -version
echo If this does not look correct press CTRL-C to cancel otherwise
pause

Upvotes: 0

gerrytan
gerrytan

Reputation: 41123

The idea of java is always compile once and run everywhere, regardless of OS, cpu architecture etc, so you might be heading the wrong direction here.

But nevertheless here are some system properties you might / not find helpful. I've listed the property key and value I have when I check it (I run Oracle JDK on Win7 64)

  • java.vm.name: Java HotSpot(TM) 64-Bit Server VM
  • sun.arch.data.model: 64
  • sun.cpu.isalist: amd64

To use any of those just do

String vmname = System.getProperty("java.vm.name");

Upvotes: 2

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