Java Installation & Configuration

Java is a widely used programming language expressly designed for use in the distributed environment of the internet. Java can be used to create complete applications that may run on a single computer or be distributed among servers and clients in a network.

Downloading Oracle Java JDK

Download Java (JDK) source tarball files for your system architecture by going to official (http://www.oracle.com/technetwork/java/javase/downloads) page and kept on path/opt/ directory.

JDK: Java Development Kit. Includes a complete JRE plus tools for developing, debugging, and monitoring Java applications.

Server JRE: Java Runtime Environment. For deploying Java applications on servers. Includes tools for JVM monitoring and tools commonly required for server applications.

In this tutorial we will be installing the JDK Java SE Development Kit 8 x64 bits. Accept the license and copy the download link into your clipboard. Remember to choose the right tar.gz (64 or 32 bits).

jdk-8u131-linux-i586.tar.gz   [For 32-bit System] jdk-8u131-linux-x64.tar.gz    [For 64-bit System]

Note: Always get the latest version from Oracle's website

Installing Java

Unpack the compressed jdk (/opt/jdk-8u131-linux-x64.tar.gz) file by using this command

# cd /opt # tar –xvzf jdk-8u131-linux-x64.tar.gz

Rename jdk-8u131 directory to jdk in /opt directory by using give command

# mv jdk-8u131 /opt/jdk

Setting up Java Environment Variables

First we need to set environment variable for java. Edit ~/.bashrc file

# nano ~/.bashrc

Append following values at end of file and save the file.

export JAVA_HOME=/opt/jdk export PATH=$JAVA_HOME/bin:$PATH

Reload the configuration file ~/.bashrc with the following command.

# source ~/.bashrc

Verify the Java version

# java -version

java version "1.8.0_131" Java(TM) SE Runtime Environment (build 1.8.0_131-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.131-b13, mixed mode)