How to Set Up Your Java_Home Path in Ubuntu

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This wikiHow teaches you how to set your JAVA_HOME Environment path. This is where Java Development Kit (JDK) is installed on your computer. Java is one of the most popular programming languages. It is used to run everything from desktop graphic user interfaces, mobile applications, web applications, as well as business and scientific applications. Many applications that run Java or are being developed in JDK need to know where the JAVA_HOME Environment path is located.

Steps

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    To open the Terminal in Ubuntu, press Ctrl + Alt + T or open the Dash and click the icon that resembles a black screen with a text prompt on it.
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    This gives you root privileges.
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    In order to get root access, you will need to enter the root password.
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    This updates your database.
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    This command is used to identify where is Java installed on your Ubuntu machine.
    • If Java has not been installed, type sudo apt-get install openjdk-9-jre-headless -y and press ↵ Enter
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    You can use the install location to set the Java_Home path. For example, if most of the return outputs are "/usr/lib/jvm/java-9-openjdk-amd64", we would use this path to set the Java_Home pather.
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    In our previous example, we would type export JAVA_HOME="/usr/lib/jvm/java-9-openjdk-amd64" . This temporarily sets the Java_Home path. However, if the system is restarted, it will be lost.
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    This executes the command.
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    This permanently sets the Java_Home path.
    • Alternatively, if you do not have root access, you can type echo "JAVA_HOME='java installation path'" >> .bashrc and press ↵ Enter to set the Java_Home path. [1]
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Community Q&A

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  • Question
    Step 8 says to "export PATH ." Should I include the "."? There is no "." in Step 6.
    Living Concrete
    Top Answerer
    You should not include the trailing period.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
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  • Question
    What should I do if my path is showing JAVA_HOME=/usr/lib/jvm/java-8-oracle?
    Community Answer
    Then Java is already installed in your system. You can change the current JAVA_HOME if you want to update it.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
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  • Question
    How do I update Java using a command?
    Pingu
    Top Answerer
    If you installed Java from APT, as is usually done on Ubuntu, you need to find which exact Java package you installed first. It's usually either some Oracle JDK or GCJ. You can use "dpkg --get-selections" to list all packages and the "grep" command to find the package in it. Then, you should write "sudo apt-get install --only-upgrade packageName", with packageName being the name of the package you found.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
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      References

      1. ↑ https://www.poftut.com/how-to-set-java-home-path-in-linux/

      About This Article

      Article Summary X

      1. Open the terminal.
      2. Type "Sudo su" and press Enter.
      3. Enter the root password.
      4. Type "sudo updatedb" and press Enter to update the Java database.
      5. Type "locate openjdk" and press Enter to find the Java installation location.
      6. Type "export JAVA_HOME=" followed by the Java installation location in the terminal and press Enter.
      7. Type "echo echo "JAVA_HOME=' " followed by the installation path.
      8. Add ">> /etc/environment" to the end of the line and press Enter.

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