I am trying to set JAVA_HOME in Ubuntu OS. I have copied jdk 1.7 in /usr/lib/jvm and set JAVA_HOME in /etc/profile file.

Contents of /usr/lib/jvm folder are as follows :

shekhar@ubuntu:~$ ls /usr/lib/jvm/
default-java        java-1.6.0-openjdk       java-6-openjdk         java-6-openjdk-i386  jdk1.7.0_01
java-1.5.0-gcj-4.6  java-1.6.0-openjdk-i386  java-6-openjdk-common  java-7-openjdk-i386

and last few lines of /etc/profile file are as follows :

export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_01
export PATH=$PATH:$JAVA_HOME/bin

After finishing all this when I run java -version command I get following output :

shekhar@ubuntu:~$ java -version
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.4) (6b24-1.11.4-1ubuntu0.12.04.1)
OpenJDK Server VM (build 20.0-b12, mixed mode)

and when I run ls -lah command I get following output :

shekhar@ubuntu:~$ ls -lah /usr/bin/java
lrwxrwxrwx 1 root root 22 Sep 29 09:58 /usr/bin/java -> /etc/alternatives/java
shekhar@ubuntu:~$ ls -lah /etc/alternatives/java
lrwxrwxrwx 1 root root 45 Sep 29 09:58 /etc/alternatives/java -> /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java

Can anyone please tell me which thing I am missing? Why Ubuntu is still pointing to open jdk and not to my jdk 7?

PS : I have seen this similar question and its answers but that question is related to Windows OS and not for Ubuntu so I am reposting this similar question for Ubuntu.