Install JAVA 7 on CentOS/RHEL

Use following steps to install Java.

Step 1: Download Archive File

Download latest version of java from its official download page.

For 32 Bit –

# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-i586.tar.gz"

For 64 Bit –

# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz"

When download has been completed, Extract tar file using following command.

For 32 Bit –
# tar xzf jdk-7u79-linux-i586.tar.gz
For 64 Bit –
# tar xzf jdk-7u79-linux-x64.tar.gz

Step 2: Install JAVA 7

After extracting tar file, we just need to set up new version of java using alternatives. Use the following commands to do it.

# cd /opt/jdk1.7.0_79/
# alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 2
# alternatives --config java

There is 1 program that provides 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           /opt/jdk1.7.0_79/bin/java

Enter to keep the current selection[+], or type selection number: 1 [Press Enter]

Now we have required to setup javac and jarring using following commands

# alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79bin/javac 2
# alternatives --install /usr/bin/javaws javaws /opt/jdk1.7.0_79/bin/javaws 2
# alternatives --set jar /opt/jdk1.7.0_79/bin/jar
# alternatives --set javac /opt/jdk1.7.0_79/bin/javac

Step 3: Check JAVA Version

Use following command to check which version of java.

# java –version

java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b17)
Java HotSpot(TM) Client VM (build 24.60-b09, mixed mode)

Step 4: Setup Environment Variables

If required then we need to set Java environment variables . Use following commands to set up it.

• Setup JAVA_HOME Variable

  # export JAVA_HOME=/opt/jdk1.7.0_79
  

• Setup JRE_HOME Variable

  # export JRE_HOME=/opt/jdk1.7.0_79/jre
  

• Setup PATH Variable

  # export PATH=$PATH:/opt/jdk1.7.0_79/bin:/opt/jdk1.7.0_79/jre/bin
  

Enjoy it!