Configure Launch4J to use 32-bit JVM only

Question

I\'m using Launch4J to start my Java application and if an x64 JRE is present on the system, Launch4J seems to prefer it.

Unfortunately my application cannot run on

Answer 1

If you don't mind including a copy of JDK with your app, try passing these arguments (in the MyApp.ini) to launch4j:

-D32 -Djava.home=d:\MyApp\JDK32 -Djava.ext.dirs=d:\MyApp\JDK32\jre\lib\ext 

There are also other things going on here that you could use:

If you don't package the JRE, you can set the Launch4j option to use "jreOnly" and then, using the DOS environment variable called "%ProgramFiles%" you can locate the 32-bit or the 64-bit JRE in the expected location, depending on whether you used the SysWOW64 32-bit cmd.exe shell or the regular 64-bit shell. Then you can pass these options to the JVM:

-D32 -Djava.home=%ProgramFiles%\Java\JREDIR -Djava.ext.dirs=%ProgramFiles%\Java\JREDIR\lib\ext 

or

-D32 -Djava.home=%ProgramFiles(x86)%\Java\JREDIR -Djava.ext.dirs=%ProgramFiles(x86)%\Java\JREDIR\lib\ext