Configure JAVA_HOME/JRE_HOME Environment Variables For Linux

Check the java version with the command java -version if it successfully installed then you can see the version else you will see the below image.

Java –version

If you get result similar to the below image you do not have Java installed. The list shows you which packages in your system have Java available and you have to install it.

chkjava

If you do not have the correct version of Java, please download Java 11 from here. ( Note: Oracle login might be required, if you do not have you can register for free and download)

 

Installation Steps:
  1. Login to Ubuntu
  2. Check whether Java is already installed by running the following command: 
    java -version

    If java 11 is not present then we have to install Java 11. Follow below steps for installation.

    3. Installing OpenJDK 11:

  3. To install the JDK, execute the following command:

    4. sudo apt-get install openjdk-11-jdk

  4. To set the JAVA_HOME environment variable, which is needed for some programs, first find out the path of your Java installation:

    5. sudo update-alternatives –config java

    It returns something like:

    There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                             Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode
  2            /usr/lib/jvm/java-17-openjdk-amd64/bin/java      1112      manual mode

Press <enter> to keep the current choice[*], or type selection number:

    In the example above, the path for Java 11 is:

    /usr/lib/jvm/java-11-openjdk-amd64

    Set the JAVA_HOME environment variable:

    Add the following line to your ~/.bashrc, ~/.zshrc, or ~/.profile file, depending on your shell:

    export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
export PATH=$JAVA_HOME/bin:$PATH

    Apply the changes:

    source ~/.bashrc  # or the appropriate config file
  5. Test it by executing:

echo $JAVA_HOME

If it returns the just set path, the environment variable has been set successfully. If it doesn’t, please make sure you followed all steps correctly.

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