Ubuntu – Install 32-bit version of Oracle JDK 7 on a 64-bit Ubuntu

It could be done like this:

1. Remove the link:

   sudo update-alternatives --remove "java" "/usr/lib/jvm/jdk[version]/bin/java"    
   sudo update-alternatives --remove "javac" "/usr/lib/jvm/jdk[version]/bin/javac"    
   sudo update-alternatives --remove "javaws" "/usr/lib/jvm/jdk[version]/bin/javaws"
   

2. Then, remove the package in the /usr/lib/jvm:

   sudo rm -r /usr/lib/jvm/jdk[version]
   

Note :

• Change [version] with any version number that's contained in jdk folder's name, example: jdk[version] = jdk1.7.0_13.

• If you are new to Linux, you should probably get familiar with the manual page. Lot of good stuff from there. Just go to the terminal and type man update-alternatives.

The keystore is : jre/lib/security/cacerts . You can list its contents by:

keytool -list -keystore java.home/jre/lib/security/cacerts -v

To find JAVA_HOME, issue this command:

sudo apt-get install galternatives

And then run that program.

But, it sound to me like you dont need to alter the keystore. What you need to do is edit the .policy file. It's easy to find at:

java.home/jre/lib/security/java.policy

Of course, if you still cant find it then it is easy to derive with this command:

sudo find / -name "java"