공돌이는 파닥파닥

Ubuntu GNU/Linux 12.04 LTS (Precise Pangolin) released. I wanted to manually install the Sun JDK 6 and 7 on Ubuntu.

Installing Sun JDK 6 on Ubuntu 12.04:

  • 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

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