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Check to see if your Ubuntu Linux operating system
architecture is 32-bit or 64-bit, open up a terminal and run the
following command below.-
uname -a or file /sbin/init
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Linux caochu-Inspiron-N5110 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Check if you have Java installed on your system. To do this, you will have to run the Java version command from terminal.
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Type/Copy/Paste:java -versio
If you have OpenJDK installed on your system, you have the wrong vendor version of Java installed for this exercise.
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sudo apt-get purge openjdk-*
Download the Oracle Java JDK for Linux.
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Unpack the compressed Java binaries, in the directory /usr/local/java8
Scroll down to the end of the file using your arrow keys and add the following lines below to the end of your./etc/profile file:
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export JAVA_HOME=/usr/local/java8/jdk1.8.0_73 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH -
source /etc/profile
Configure default JDK version :
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sudo update-alternatives –install /usr/bin/java java /usr/local/java8/jdk1.8.0_73/bin/java 300
sudo update-alternatives –install /usr/bin/javac javac /usr/local/java8/jdk1.8.0_73/bin/javac 300
sudo update-alternatives –install /usr/bin/jar jar /usr/local/java8/jdk1.8.0_73/bin/jar 300
sudo update-alternatives –install /usr/bin/javah javah /usr/local/java8/jdk1.8.0_73/bin/javah 300
sudo update-alternatives –install /usr/bin/javap javap /usr/local/java8/jdk1.8.0_73/bin/javap 300 -
sudo update-alternatives –config java
Test
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java -version
