Problem #1 during installing Apache ofbiz

The first problem that I faced during installing Apache ofbiz was using the wrong version of JDK installed on the system

 >>The correct version of JDK to be used is JDK-6-sun version, it can be   downloaded using the following commands:

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ferramroberto/java
sudo apt-get update
sudo apt-get install sun-java6-jdk sun-java6-plugin

>>In order to check the total number of versions of java installed on the system using the following command:

demon@demon-pc:~$ sudo update-alternatives --config java
There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                           Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-6-openjdk/jre/bin/java        1061      auto mode
  1            /usr/lib/jvm/java-6-openjdk/jre/bin/java        1061      manual mode
* 2            /usr/lib/jvm/java-6-sun/jre/bin/java            63        manual mode
  3            /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java   1051      manual mode

Press enter to keep the current choice[*], or type selection number:

>>If the default version is not the sun java version , then change the default version.