Installing Java

Follow these steps to install Java:

1. Update the package index using following command:

        sudo apt-get update 

1. Next, install Java. The following command will install the JRE:

        sudo apt-get install default-jre 

1. To set the JAVA_HOME environment variable, first get the Java installation location. Do this by executing the following command:

        update-java-alternatives -l  

1. The previous command will print the list of Java applications installed on your machine along with their installation paths. Copy the Java path that appears on your Terminal: 

        java-1.8.0-openjdk-amd64 1081
        /usr/lib/jvm/java-1.8.0-openjdk-amd64

1. Open the /etc/environment file for editing using the following command:

        sudo nano /etc/environment 

1. Add the Java path (the one that you copied earlier) inside the /etc/environment file in the following format:

        JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-amd64" 

1. Type Ctrl + X and choose Y to save and close the file.
2. Next, reload the file using the following command:

       sudo source /etc/environment