java_inst.txt

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Java install
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sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update && sudo apt-get install oracle-jdk7-installer

# After the installation you have enable the jdk

update-alternatives --display java

# Check if Ubuntu uses Java JDK 7

java -version

# If all went right the answer should be something like this:

# java version “1.7.0_25″
# Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
# Java HotSpot(TM) Server VM (build 23.3-b01, mixed mode)
# Check what compiler is used

javac -version

# It should show something like this

# javac 1.7.0_25
# Add JAVA_HOME to environment variable

# Edit /etc/environment and add JAVA_HOME=/usr/lib/jvm/java-7-oracle to the end of the file

sudo nano /etc/environment

# Append to the end of the file

JAVA_HOME=/usr/lib/jvm/java-7-oracle

# Log in and out (or reboot) for the changes to take effect.

# If you want to remove oracle JDK

sudo apt-get remove oracle-jdk7-installer