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java 32 bit runtime under 64 bit firefox ?

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New User

java 32 bit runtime under 64 bit firefox ?

I want to use 32 bit java runtime on my 64 bit Ubuntu 12.04 system. jre installation includes configuration of the java plugin for the firefox. is there any compatibility issues I should know about?

8 REPLIES
Site Moderator

Re: java 32 bit runtime under 64 bit firefox ?

Just make sure that Firefox can find the 32 bit Java plugin file (libnpjp2.so) by placing a symlink in a location where Firefox scans for plugins.

New User

Re: java 32 bit runtime under 64 bit firefox ?

Firefox doesn't see the java plugin! This is what I did:

0. //ubuntu amd64: install g++-multilib

1. # cp jdk-6u35-linux-i586.bin /opt/java/

2. # cd /opt/java/

3. # ./jdk-6u35-linux-i586.bin

4. # update-alternatives --install /usr/bin/java java /opt/java/jdk1.6.0_35/bin/java 100

5. # update-alternatives --install /usr/bin/javaws javaws /opt/java/jdk1.6.0_35/bin/javaws 100

6. # update-alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /opt/java/jdk1.6.0_35/jre/lib/i386/libnpjp2.so 100

7. # update-alternatives --config java

8. # java -version

9. $ JAVA_HOME=/opt/java/jdk1.6.0_35/

10. $ export JAVA_HOME

11. $ PATH=$PATH:/opt/java/jdk1.6.0_35/bin

12. $ export PATH

13. $ javac

In addition to the fact, that Firefox actually doesn't see the java, there's also a problem with JAVA_HOME and PATH variables - they only save their values for the current session.

New User

Re: java 32 bit runtime under 64 bit firefox ?

Up.

Anyone?

New User

Re: java 32 bit runtime under 64 bit firefox ?

May be this will do:

6. # update-alternatives --install /usr/ lib64 /mozilla/plugins/libjavaplugin.so libjavaplugin.so /opt/java/jdk1.6.0_35/jre/lib/i386/libnpjp2.so 100

??

Site Moderator

Re: java 32 bit runtime under 64 bit firefox ?

Which version of Firefox do you have installed?
A 32 bit or a 64 bit version?

If you run a 64 bit version of Firefox then Firefox needs a 64 bit Java plugin (lib64) and a 32 bit Firefox needs a 32 bit Java plugin (lib32), otherwise it won't work.

New User

Re: java 32 bit runtime under 64 bit firefox ?

This is topic subject: [QUOTE] java 32 bit runtime under 64 bit firefox ? [\QUOTE]

You are speaking of pretty obvious things.

Let me remind your first answer: [QUOTE] Just make sure that Firefox can find the 32 bit Java plugin file (libnpjp2.so) by placing a symlink in a location where Firefox scans for plugins. [\QUOTE]

Why do you change your answer like this?

Site Moderator

Re: java 32 bit runtime under 64 bit firefox ?

I do not know which Firefox version you currently have installed.
I assumed the normal 32 bit version, but I might be wrong about that.
So please confirm which version you have.

New User

Re: java 32 bit runtime under 64 bit firefox ?

Build identifier: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:15.0) Gecko/20100101 Firefox/15.0

What's the point of this topic? - how to keep compatibiliy with 32-bit java applets under 64-bit firefox ?? This is the point.

You say this is impossible? :-\