Category Archives: Install java 8

How to install Java 8 (JDK 8u45) on Centos 6- 64 bit

# cd /opt/
# wget
# tar xzf jdk-8u45-linux-x64.tar.gz

Install Java with Alternatives

After extracting archive file use alternatives command to install it. alternatives command is available in chkconfig package.

# cd /opt/jdk1.8.0_45/
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_45/bin/java 2
# alternatives --config java

There are 3 programs which provide 'java'.

  Selection    Command
*  1           /opt/jdk1.7.0_71/bin/java
 + 2           /opt/jdk1.8.0_25/bin/java
   3           /opt/jdk1.8.0_45/bin/java

Enter to keep the current selection[+], or type selection number: 3

At this point JAVA 8 has been successfully installed on your system. We also recommend to setup javac and jar commands path using alternatives

# alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_45/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_45/bin/javac 2
# alternatives --set jar /opt/jdk1.8.0_45/bin/jar
# alternatives --set javac /opt/jdk1.8.0_45/bin/javac 

Check Installed Java Version

Check the installed version of java using following command.

root@tecadmin ~# java -version

java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

Configuring Environment Variables

Most of java based application’s uses environment variables to work. Set the Java environment variables using following commands

  • Setup JAVA_HOME Variable
# export JAVA_HOME=/opt/jdk1.8.0_45
  • Setup JRE_HOME Variable
# export JRE_HOME=/opt/jdk1.8.0_45/jre
  • Setup PATH Variable
# export PATH=$PATH:/opt/jdk1.8.0_45/bin:/opt/jdk1.8.0_45/jre/bin