Step 1: First download the tar file of java ( jre-7u5-linux-i586.tar.gz) using below URL
http://www.java.com/en/download/linux_manual.jsp
Step 2: tar -zxvf /Path to 'jre-7u5-linux-i586.tar.gz'/
Step 3: Move extracted folder to /usr/lib/jvm
#sudo cp -r jre1.7.0_05 /usr/lib/jvm/
Step 4: Install java now
#sudo update-alternatives –install /usr/bin/java java /usr/lib/jvm/jre1.7.0_05/bin/java 3
Step 5: Now choose the upgraded java version from :-
#sudo update-alternatives –config java
In My case i have select 4 for my system.. choose :- /usr/lib/jvm/jdk1.7.0_04/bin/java
Step 6: Now create a soft link:-
#sudo ln -s /usr/lib/jvm/jre1.7.0_05/lib/i386/libnpjp2.so ~/.mozilla/plugins/
Step 7: Now check java version with the below command
#sudo java -version
you should get 1.7 java version in the output.
