[gentoo-java] JAVA_HOME set to 1.4.2

[gentoo-java] JAVA_HOME set to 1.4.2

[Kurt Guenther]

Apologies if this is an FAQ, but I hunted around before posting.

My JAVA_HOME is set to :

$ echo $JAVA_HOME
/opt/sun-jdk-1.4.2.12

but, my version is 1.5:

 $ java -version
java version "1.5.0_07"

Here are my java-configs:

$ java-config-1 -L
[sun-jdk-1.4.2.12] "Sun JDK 1.4.2.12" (/etc/env.d/java/20sun-jdk-1.4.2.12) *
$ java-config-2 -L
1) Sun JDK 1.4.2.12 [sun-jdk-1.4] (/usr/share/java-config-2/vm/sun-jdk-1.4)
*) Sun JDK 1.5.0.07 [sun-jdk-1.5] (/usr/share/java-config-2/vm/sun-jdk-1.5)

This doesn't seem right as some scripts use JAVA_HOME to locate jar
files and other things.  Is there a way to correct this (besides the
obvious of overriding it)?

--Kurt

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Re: [gentoo-java] JAVA_HOME set to 1.4.2

[Wiktor Wandachowicz]

See:
http://www.gentoo.org/proj/en/java/java-upgrade.xml#doc_chap6
(Applications try to use JAVA_HOME, which is set
to the Generation-1 VM)

Add the relevant snippet to one of your startup files, but this
way you loose some of the benefits of Generation-2 Java
handling through wrappers in /usr/bin. Decide for yourself ;)

Regards,
Wiktor
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Re: [gentoo-java] JAVA_HOME set to 1.4.2

[Joshua Nichols]

Wiktor Wandachowicz wrote:
> Add the relevant snippet to one of your startup files, but this
> way you loose some of the benefits of Generation-2 Java
> handling through wrappers in /usr/bin. Decide for yourself ;)
>
That's actually not true. What you lose, is the benefit of not having
the current VM tied to the environment. Specifically, if you don't have
a user VM set... JAVA_HOME would point at the system VM... but if at
some point, you set a user VM, JAVA_HOME would still point to the system
VM until you source whichever file you add that snippet to.

It is extremely important to note that if you decide to use the snippet
for root, then java-config-1 has no way of knowing what the generation-1
VM is, because it uses JAVA_HOME to determine this.

-- 
Joshua Nichols
Gentoo/Java - Project Lead

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Re: [gentoo-java] JAVA_HOME set to 1.4.2

[Wiktor Wandachowicz]

> That's actually not true. What you lose, is the benefit of not having
> the current VM tied to the environment. Specifically, if you don't have
> a user VM set... JAVA_HOME would point at the system VM... but if at
> some point, you set a user VM, JAVA_HOME would still point to the
> system VM until you source whichever file you add that snippet to.
>
> It is extremely important to note that if you decide to use the snippet
> for root, then java-config-1 has no way of knowing what the generation-1
> VM is, because it uses JAVA_HOME to determine this.

That's what I've meant when I wrote "some of the benefits".
Independence from the environment settings was the most obvious
one. But thanks for the clarification straight from the source.

Given the consequences, I think that the script snippet from the
docs can be put in a file. Then it could be sourced only when
necessary before running specific scripts. This way Kurt can have
best of both worlds, benefits from generation-2 and working
scripts that depend on JAVA_HOME variable.

Regards,
Wiktor

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