Ubuntu. Oracle Java 7. Install the Oracle JDK 7. Install the Oracle JRE 7. Install the Firefox/Chrome Oracle Java 7 plugin

This tut works fine for me on backtrack 5 r3 

-ok lets install  this sweety zombie ...hahaha

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Install the JDK

• Download the 32bit or 64bit Linux "compressed binary file" - it has a ".tar.gz" file extension
• Uncompress it
  tar -xvf jdk-7u10-linux-i586.tar.gz
  

JDK 7 package is extracted into ./jdk1.7.0_10 directory. - Now move the JDK 7 directory to /usr/lib

sudo mv jdk1.7.0_10 /usr/lib/jvm/jdk1.7.0_10

• Now run

sudo update-alternatives --config java

You will get output as:

$sudo update-alternatives –config java 

There are 2 choices for the alternative java (providing /usr/bin/java).

 Selection Path 

 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 

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

Remember the last number and press enter to exit this utility i.e. in this example remember the number 2.
if only one alternative is shown then remember the number 0

• Now run

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_10/jre/bin/java 3

This will add your new JDK 7 installation into alternatives list i.e.
use the remembered number + 1 i.e. 3 in the example above.
- Run

sudo update-alternatives --config java 

You will see output similar one below - choose the number of jdk1.7.0_10 i.e. 3:

$sudo update-alternatives –config java 

There are 3 choices for the alternative java 

(providing /usr/bin/java).

 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/jdk1.7.0_10/jre/bin/java 3 manual mode 
Press enter to keep the current choice[*], or type selection number: 3
 update-alternatives: using /usr/lib/jvm/jdk1.7.0_10/jre/bin/java 
to provide /usr/bin/java (java) in manual mode. 

Check the version of you new JDK 7 installation:
java -version

java version "1.7.0_10"
Java(TM) SE Runtime Environment (build 1.7.0_10-b13)
Java HotSpot(TM) Server VM (build 22.0-b10, mixed mode) 

Install the JRE

• Download the 32bit or 64bit Linux "compressed binary file" - it has a ".tar.gz" file extension
• Uncompress it
  tar -xvf jre-7u10-linux-i586.tar.gz
  

JRE 7 package is extracted into ./jre1.7.0_10 directory. - Now move the JRE 7 directory to /usr/lib
sudo mv jre1.7.0_10 /usr/lib/jvm/jre1.7.0_10

• Now run

sudo update-alternatives --config java
You will get output as:

$sudo update-alternatives –config java There are 2 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 

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

Remember the last number and press enter to exit this utility i.e. in this example remember the number 2.
if only one alternative is shown then remember the number 0

• Now run

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jre1.7.0_10/bin/java 3

This will add your new JRE 7 installation into alternatives list i.e.
use the remembered number + 1 i.e. 3 in the example above.

- Run

sudo update-alternatives --config java 

You will see output similar one below - choose the number of jre1.7.0_10 i.e. 3:

$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/jre1.7.0_10/jre/bin/java 3 manual mode 

Press enter to keep the current choice[*], or type selection number: 3 

update-alternatives: using /usr/lib/jvm/jre1.7.0_10/

jre/bin/java to provide /usr/bin/java (java) in manual mode.

N.B. if there was no previous java installation then the new JRE will be the default and you will not see the above.
Check the version of you new JRE 7 installation:
java -version

java version "1.7.0_10"
Java(TM) SE Runtime Environment (build 1.7.0_10-b13)
Java HotSpot(TM) Server VM (build 22.0-b10, mixed mode) 

Install the Firefox/Chrome plugin

In a terminal:

mkdir ~/.mozilla/plugins 

Remove the IcedTea plugin, if it has been installed.

sudo apt-get remove icedtea6-plugin 

Remove a former version of the Java plugin (may or may not be present)

sudo rm ~/.mozilla/plugins/libnpjp2.so 

Now you can install the plugin, by creating a symbolic link (you tell Firefox, where the plugin is located).

sudo ln -s /usr/lib/jvm/jre1.7.0_10/lib/i386/libnpjp2.so ~/.mozilla/plugins/ 

Confirm that the JRE has been successful by using the official oracle website.

source:
http://www.iasptk.com/ubuntu-oracle-java7-jdk7-jre7-firefox-chrome-plugin