[gentoo-java] specifying jvm in scripts?

[gentoo-java] specifying jvm in scripts?

[Roy Wright]

Howdy,

Just upgraded to the new java system, no problems.  THANK YOU for all 
the hard work!

I have several java programs that I launch via scripts.  Some are 1.4, 
some are 1.5.
Just curious if there is a method to select the jvm from within the 
script independent
of the system or user jvm?  Something like:

  JAVACMD = `java-config --java 1.4`

TIA,
Roy

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Re: [gentoo-java] specifying jvm in scripts?

[Caster]

Roy Wright wrote:
> I have several java programs that I launch via scripts.  Some are 1.4,
> some are 1.5.
> Just curious if there is a method to select the jvm from within the
> script independent
> of the system or user jvm?  Something like:
> 
>  JAVACMD = `java-config --java 1.4`

Yes, with GENTOO_VM and VMHANDLE of the jvm you want, like

GENTOO_VM="sun-jdk-1.5"

This will make all the wrapper scripts for java, javac, etc. call the
binaries from selected VM.
If your program also relies on JAVA_HOME, you can add this after the
GENTOO_VM line:

JAVA_HOME=$(java-config --jdk-home)

Not sure how you can make it select "any of the 1.4 vm that's installed"
though...

Also there's some way for packages installed with portage to specify
what VM they need, but I dont know the details, maybe somebody else...

Caster
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