Java Installation

Java Installation:

During installation of java using rpm file I found issues many times. after that I found a better way to install java from sun site, using below steps I have installed java successfully many times without facing any issues, we can also install multiple version of java easily if required.


Downloading latest java Archive:


# wget –-“

# tar –xvzf jdk-8u101-linux-x64.tar.gz


Install java with alternatives:

After extracting java archive file, we just need to set up use newer version of java using alternatives.

cd /opt/jdk1.8.0_101/

# alternatives –install /usr/bin/java java /opt/jdk1.8.0_101/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_45/bin/java

3           /opt/jdk1.8.0_91/bin/java

4           /opt/jdk1.8.0_101/bin/java


Enter to keep the current selection[+], or type selection number: 4



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 /app/jdk1.8.0_101/bin/jar 2

#alternatives –install /usr/bin/javac javac /app/jdk1.8.0_101/bin/javac 2

#alternatives –set jar /app/jdk1.8.0_101/bin/jar

#alternatives –set javac /app/jdk1.8.0_101/bin/javac



Check Installed Java Version:

# java -version

java version “1.8.0_101”

Java(TM) SE Runtime Environment (build 1.8.0_101-b14)

Java HotSpot(TM) 64-Bit Server VM (build 25.101-b14, mixed mode


Configuring Environment Variables:

  • Setup JAVA_HOME variable
export JAVA_HOME=/app/jdk1.8.0_101


  • Setup JRE_HOME Variable
export JRE_HOME=/app/jdk1.8.0_101/jre


  • Setup PATH Variable
export PATH=$PATH:/app/jdk1.8.0_101/bin:/app/jdk1.8.0_101/jre/bin




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