Configure java home in windows

How to Set JAVA_HOME for JDK & JRE: A Step-by-Step Guide

This article was co-authored by wikiHow staff writer, Nicole Levine, MFA. Nicole Levine is a Technology Writer and Editor for wikiHow. She has more than 20 years of experience creating technical documentation and leading support teams at major web hosting and software companies. Nicole also holds an MFA in Creative Writing from Portland State University and teaches composition, fiction-writing, and zine-making at various institutions.

This article has been viewed 323,880 times.

Are you seeing Java errors like «JAVA_HOME is not defined correctly?» or «JAVA_HOME is set to an invalid directory?» If you’ve recently installed the Java Development Kit (JDK) or the Java Runtime Environment (JRE), you’ll need to set your JAVA_HOME variables and configure the path so applications know where to find Java. This wikiHow article will show you the easiest ways to change or set the Java home path on Windows, macOS, and Linux.

• Before you can set JAVA_HOME, you’ll need the full path to your JDK or JRE installation.
• Once you set the JAVA_HOME environment variable, you can run the command echo $JAVA_HOME to see the new path.
• To set the Java home and path on Linux or macOS permanently (even after a reboot), add the environment variables to your .bashrc or .zshrc file.

Windows

• Open File Explorer, click This PC in the left panel, then navigate to C:\Program Files\Java. The directory you’re looking for should have the name of the JDK version, such as C:\Program Files\Java\jdk-19.
• If you installed the JRE instead of the JDK, you’ll have something like C:\Program Files\Java\jre1.8.0_351 instead.
• You can also open the command prompt and run the command wmic product where «Name like ‘%%Java%%'» get installlocation,Name . This will tell you the full path of the JDK, even if you haven’t yet set JAVA_HOME.

• Press the Windows key on your keyboard and type advanced system .
• Click View advanced system settings in the search results.

Click the Environment Variables button. You’ll see it at the bottom-right corner of the System Properties window.

• If you have multiple installations of the JDK and want to change JAVA_HOME to your new installation, select the current JAVA_HOME user variable and click Edit… instead.

• If you’re editing the current JAVA_HOME path, you’ll already have JAVA_HOME here. So, you can skip this step.

• If you’re adding a second path to JAVA_HOME, just type a semicolon (;) after the first path, then enter the second path.
• If you’re replacing an old JAVA_HOME path, just delete the current path and enter the new one.

• If you want other users on this PC to be able to access Java binaries from the command line, repeat this step for the «Path» variable under «System variables» as well.

• Click the New button at the top.
• Enter the full path to the JRE or JDK with \bin at the end. For example, C:\Program Files\Java\jdk-19\bin or C:\Program Files\Java\jre1.8.0_351\bin.
• Click OK.

• You won’t need to restart your computer for the changes to take effect, but you will need to relaunch any apps that were trying to access Java.
• Open a new command prompt window and run the command echo %JAVA_HOME% to display the new path to JAVA_HOME.
  • Make sure this is a new command prompt window. If you still have the same window open, the command will fail because it doesn’t have the new environment variables.

  macOS

  

  Open a Terminal window. To open Terminal, search for Terminal in Spotlight. Or, you can open Finder, click the Go menu, select Utilities, and choose the Terminal app.

  

  • If you have more than one Java installation and want to see the paths to all of them, use /usr/libexec/java_home -V instead.

  

  Copy the path and paste it somewhere handy. Highlight the path to the Java installation you want to use as JAVA_HOME, press Cmd + V to copy it, then paste it into a sticky note or text file.

  

  • Type cd ~ and press Return.
  • Type open .zshrc and press Return. This should open the file in a text editor.
  • If the file is not found, type echo > .zshrc and press Return. Then, run open .zshrc again.

  

  • export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-17.0.1.jdk/Contents/Home
    • Replace /Library/Java/JavaVirtualMachines/jdk-17.0.1.jdk/Contents/Home with the full path to the /Contents/Home directory of your Java installation if it’s different.

    

    Type source .zshrc and press ⏎ Return . Once you’ve edited your profile, this command ensures that your environment variables will be updated for the current terminal window (and any other windows you open from now on).

    

    • If you had any other windows open that were attempting to find Java binaries, close and reopen them.
    • Shopping for PC accessories or office supplies? Check out our coupon site for Staples discounts or our coupon site for Office Depot.

    Linux

    

    

    • readlink -f `which javac`
    • If that doesn’t work, try running update-alternatives —list java .
    • If neither of these commands works, run whereis java , which will usually result in a symbolic link like /usr/bin/java.
      • Once you get the directory, find out where it links using ls -la /bin/java .
      • If that points you to another directory, e.g., /etc/alternatives/java, run ls -la /etc/alternatives/java .
      • At that point, you should see a much longer directory, which is actually the home to the Java binaries. For example, usr/lib/jvm/java-11-openjdk-arm64/bin/java . This is the directory you want.

      

      • echo «export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-arm64» >> ~/.bashrc
      • echo «export PATH=$PATH:$JAVA_HOME/bin» >> ~/.bashrc

      

      Expert Q&A

      In Linux, you can set JAVA__HOME for all users by editing the global .bashrc, which is located at /etc/bash.bashrc. Just use echo and replace ~/.bashrc with /etc/bash.bashrc .

      

      You Might Also Like

      

      Use Easy Windows CMD Commands to Check Your Java Version

      

      How to Do Division in Java (Integer and Floating Point)

      

      How to Compile and Run Java Programs Using Notepad++

      

      

      

      

      

      

      

      

      

      

      Simple Steps to Type a Bunny with Your Keyboard

      

      About This Article

      This article was co-authored by wikiHow staff writer, Nicole Levine, MFA. Nicole Levine is a Technology Writer and Editor for wikiHow. She has more than 20 years of experience creating technical documentation and leading support teams at major web hosting and software companies. Nicole also holds an MFA in Creative Writing from Portland State University and teaches composition, fiction-writing, and zine-making at various institutions. This article has been viewed 323,880 times.

      Is this article up to date?

      Quizzes

      You Might Also Like

      Use Easy Windows CMD Commands to Check Your Java Version

      How to Do Division in Java (Integer and Floating Point)

      How to Compile and Run Java Programs Using Notepad++

      Источник

      Configure java home in windows

      • The basics of TOGAF certification and some ways to prepare TOGAF offers architects a chance to learn the principles behind implementing an enterprise-grade software architecture, including.
      • Haskell vs. PureScript: The difference is complexity Haskell and PureScript each provide their own unique development advantages, so how should developers choose between these two .
      • A quick intro to the MACH architecture strategy While not particularly prescriptive, alignment with a MACH architecture strategy can help software teams ensure application .
      • Postman API platform will use Akita to tame rogue endpoints Akita’s discovery and observability will feed undocumented APIs into Postman’s design and testing framework to bring them into .
      • How to make use of specification-based test techniques Specification-based techniques can play a role in efficient test coverage. Choosing the right techniques can ensure thorough .
      • GitHub Copilot Chat aims to replace Googling for devs GitHub’s public beta of Copilot Chat rolls out GPT-4 integration that embeds a chat assistant into Visual Studio, but concerns .
      • Explore the key features of Microsoft Defender for Cloud Apps Monitoring and visibility are crucial when it comes to cloud security. Explore Microsoft Defender for Cloud Apps, and see how .
      • 4 popular machine learning certificates to get in 2023 AWS, Google, IBM and Microsoft offer machine learning certifications that can further your career. Learn what to expect from each.
      • Navigate multi-cloud billing challenges Keeping track of cloud bills from multiple clouds or accounts can be complex. Learn how to identify multi-cloud billing .
      • Google: 41 zero-day vulnerabilities exploited in 2022 While attackers increasingly exploited zero-day flaws last year, one of the most notable findings from the report emphasized how .
      • Security hygiene and posture management: A work in progress Security hygiene and posture management may be the bedrock of cybersecurity, but new research shows it is still decentralized and.
      • How to avoid LinkedIn phishing attacks in the enterprise Organizations and users need to be vigilant about spotting LinkedIn phishing attacks by bad actors on the large business social .
      • AWS Control Tower aims to simplify multi-account management Many organizations struggle to manage their vast collection of AWS accounts, but Control Tower can help. The service automates .
      • Break down the Amazon EKS pricing model There are several important variables within the Amazon EKS pricing model. Dig into the numbers to ensure you deploy the service .
      • Compare EKS vs. self-managed Kubernetes on AWS AWS users face a choice when deploying Kubernetes: run it themselves on EC2 or let Amazon do the heavy lifting with EKS. See .

      Источник

      Переменная окружения JAVA_HOME

      Во многих статьях в интернете, документации к инструментам для разработки на Java и в книгах зачастую упоминается JAVA_HOME. Что же такое JAVA_HOME?

      Что такое JAVA_HOME

      JAVA_HOME это переменная окружения, указывающая на директорию с установленным JDK (Java Development Kit, комплект разработчика Java). JAVA_HOME это соглашение, используемое во многих программах из экосистемы Java.

      Какие программы используют JAVA_HOME

      • Intellij IDEA, Eclipse, NetBeans
      • Apache Maven, Apache Ant, Gradle
      • Apache Tomcat
      • Jenkins

      Некоторые игры, написанные на Java (например, Minecraft), тоже могут требовать установленной переменной JAVA_HOME.

      Ошибки, связанные с JAVA_HOME

      Если переменная окружения JAVA_HOME не определена, некоторые программы могут выдавать следующие ошибки:

      • Переменная среды java_home не определена
      • Cannot determine a valid Java Home
      • JAVA_HOME is set to an invalid directory
      • JAVA_HOME is not defined correctly
      • JAVA_HOME environment variable is not set
      • JAVA_HOME command not found
      • JAVA_HOME not found in your environment
      • JAVA_HOME does not point to the JDK

      При появлении таких ошибок просто установите переменную JAVA_HOME

      Как установить переменную окружения JAVA_HOME в Windows

      Сперва вам нужно установить JDK или JRE.

      • Установите JDK, если вы занимаетесь разработкой программ на Java
      • Установите JRE, если вам нужно только запустить прикладную программу на Java

      После установки JDK либо JRE запишите путь установки, он понадобится.

      Теперь щёлкните правой кнопкой на «Мой компьютер» → «Свойства» → «Дополнительные параметры системы» → «Переменные среды…». В разделе «Системные переменные» нажмите кнопку «Создать…» и укажите следующие данные:

      Имя переменной	JAVA_HOME
      Значение переменной	Путь к директории JDK / JRE, например: C:\Java\jdk-11.0.6

      Сохраните изменения, кликнув «OK». Теперь выберите в списке переменную окружения Path и нажмите «Изменить…». В конце списка добавьте строчку со значением «%JAVA_HOME%\bin«

      

      

      Для проверки откройте консоль (Win+R, cmd) и укажите последовательно укажите две команды:

      Если вы правильно установили JDK/JRE и правильно установили переменные окружения, вы увидите вывод наподобие этого:

      

      Это будет служить результатом того, что переменная JAVA_HOME установлена правильно и Java работает из командной строки.

      Резюме

      В данной статье мы рассказали вам, что являет собой переменная окружения JAVA_HOME, где она используется и как её корректно указать.

      Источник