Installation guide for Sun's JDK in Ubuntu

ubuntu java sun installation.md

Installing Sun JDK 6 on Ubuntu 12.04:

Download the sun jdk 6 bin

Make the bin file executeable:

chmod +x jdk-6u32-linux-x64.bin

Extract the bin file:

./jdk-6u32-linux-x64.bin

Move extracted folder to this location:

sudo mv jdk1.6.0_32 /usr/lib/jvm/

Install new java source in system:

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.6.0_32/bin/javac 1
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.6.0_32/bin/java 1
sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.6.0_32/bin/javaws 1

Choose default java:

sudo update-alternatives --config javac
sudo update-alternatives --config java
sudo update-alternatives --config javaws

java version test:

java -version

Verify the symlinks all point to the new java location:

ls -la /etc/alternatives/java*

Enable Java plugin for Mozilla Firefox (even for Chrome)

for 64-Bit jdk

sudo ln -s /usr/lib/jvm/jdk1.6.0_32/jre/lib/amd64/libnpjp2.so /usr/lib/mozilla/plugins

for 32-Bit jdk

sudo ln -s /usr/lib/jvm/jdk1.6.0_32/jre/lib/i386/libnpjp2.so /usr/lib/mozilla/plugins

Installing Sun JDK 7 on Ubuntu 12.04:

Download the sun jdk 7 tar file from here

Extract the tar file:

tar -xvzf jdk-7u4-linux-x64.tar.gz

Move extracted folder to this location:

sudo mv jdk1.7.0_04 /usr/lib/jvm/

Install new java source in system:

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_04/bin/javac 1
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_04/bin/java 1
sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.7.0_04/bin/javaws 1

Choose default java:

sudo update-alternatives --config javac
sudo update-alternatives --config java
sudo update-alternatives --config javaws

java version test:

java -version

Verify the symlinks all point to the new java location:

ls -la /etc/alternatives/java*

Enable Java plugin for Mozilla Firefox (even for Chrome)

for 64-Bit jdk

sudo ln -s /usr/lib/jvm/jdk1.7.0_04/jre/lib/amd64/libnpjp2.so /usr/lib/mozilla/plugins

for 32-Bit jdk

sudo ln -s /usr/lib/jvm/jdk1.7.0_04/jre/lib/i386/libnpjp2.so /usr/lib/mozilla/plugins

Update:

I have added Java Web Start configuration (Thanks Jack).

Update:

I have added Java Plugin configuration for Mozilla Firefox even for Chrome (Thanks shetty).

Update:

JAVA_HOME configuration:

Some tools require JAVA_HOME variable. You can set JAVA_HOME in Ubuntu so simple: Edit the file .bashrc under your home directory and add the following lines: (if .bashrc is hidden click in Nautilus Menu View > Show Hidden Files)

export JAVA_HOME=/path/your/jdk
export PATH=$JAVA_HOME/bin:$PATH