Java

How to install java system wide on Fedora/CentOS Linux

Download the JRE rpm file from Oracle website, then add java to alternatives as follow:

 alternatives --install /usr/bin/java java /usr/java/latest/bin/java 20000
 alternatives --install /usr/bin/javaws javaws /usr/java/latest/bin/javaws 20000
 alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /usr/java/latest/lib/i386/libnpjp2.so 20000

On 64-bit systems, replace the last command with:

 alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86_64 /usr/java/latest/lib/amd64/libnpjp2.so 20000

How to install java system wide on Ubuntu/Debian Linux

Download the binary file from Oracle website, place it where the JVMs are used to be:

 mv jdk-6u32-linux-x64.bin /usr/lib/jvm/
 cd /usr/lib/jvm
 chmod +x jdk-6u32-linux-x64.bin
 ./jdk-6u32-linux-x64.bin

Update alternatives:

 update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.6.0_32/bin/java" 1
 update-alternatives --install "/usr/lib/mozilla/plugins/libjavaplugin.so" "mozilla-javaplugin.so" "/usr/lib/jvm/jdk1.6.0_32/lib/i386/libnpjp2.so" 1

On 64-bit systems, replace the last command with:

 update-alternatives --install "/usr/lib/mozilla/plugins/libjavaplugin.so" "mozilla-javaplugin.so" "/usr/lib/jvm/jdk1.6.0_32/jre/lib/amd64/libnpjp2.so" 1