Java install windows java home

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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.

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How to Setup, Configure JAVA_HOME and JRE_HOME Environment Variables on Windows?

In order to run Java application you need to have first installed Java on your Mac or Windows laptop or desktop.

It’s absolutely required to complete Java setup right way for your production & development applications. If you are a first time Java user then first step is to go to official Oracle website and download JDK.

Below detailed steps will help also if you have below questions:

How to fix JAVA_HOME error while starting Tomcat Server?
Why i’m getting jre_home is not defined correctly tomcat error?
How to set jre_home environment variable?
jre_home on windows
Difference between java_home vs jre_home
How to set jre_home via command line?

In this tutorial we will discuss how to install Java, setup JRE_HOME & JAVA_HOME environment variables on Windows platform only. For Mac and Linux, I’ll publish another tutorial with all detailed steps later.

Let’s get started

Step-1

Configure JAVA_HOME / JRE_HOME Environment Variables

Go to official Oracle site and Download JDK binary
Click on Java Download
Accept License Agreement
Download binary next to Windows x64

Step-2

Double click on .exe file and it will install JDK and JRE both on your Windows Laptop/Desktop
By default it will install JDK and JRE at location: C:\Program Files\Java folder

Step-3

Now minimize all windows and you will see Desktop icon (check this screenshot)
Right click on it
Click on Properties
Click on Advanced System Settings link as you in above diagram

Step-4

Step-5

New Pop-up Window will appear
Click on New…
Enter JAVA_HOME as variable name and C:\Program Files\Java\jdk1.8.0_121 as Value
Enter JRE_HOME as variable name and C:\Program Files\Java\jre1.8.0_121 as Value
Click OK button
Exit System Properties window

At this time, you are all set.

How to verify?

How to verify if JAVA_HOME and JRE_HOME environment variables setup correctly or not?

Just open command prompt
Type java -version
It will print installed Java details as shown below

That’s it. Let me know if you face any issue installing Java on your laptop. Make sure to update Java version number as per your installation in above steps. Happy coding and happy open sourcing.

What is a difference Between JRE and JDK?

Ideally JRE provides runtime environment for your application. While running your development or production environment, you just need JRE.

On other end, while you are developing Java application , JDK provides more debugging and development functionalities which wont part of JRE.

If you liked this article, then please share it on social media. Have a question or suggestion? Please leave a comment to start the discussion. 👋

How to Set JAVA_HOME Variable on Windows 11

A step-by-step guide to setting up and verifying the JAVA_HOME variable on the Windows operating system to run and execute Java files.

While running your Java program/application, if you are getting a JAVA_HOME error. Then this may be because you have not set up the JAVA_HOME environment variable on your Windows 11. Here is a detailed guide on; how to set the JAVA_HOME variable on Windows.

JAVA_HOME is the name of an environment variable on the operating system that points to the installation directory of Java Runtime Environment or Java Development Kit. You can also check out our guide on; how to install and set up Java JDK on Windows 11.

How to Setup JAVA_HOME Variable on Windows 10

By just downloading and installing Java, Java files will not work. You have to; set up the java environment variable and JAVA_HOME variable on your Windows 11. So, the system can execute the Java code on your Windows 11 system.

To set up the JAVA_HOME variable, follow the steps mentioned below. Or, if you prefer a video tutorial, you can watch the video mentioned below.

Step 3: It will open the “System Properties“ window. Click on the “Advanced” tab and click the “Environment Variable” option.

Step 4: Under the “System variables“section, click the “New” button. Here, enter JAVA_HOME as a variable name and the installation directory of Java JDK under variable value. Then click on “OK” to save the changes.

Step 5: Now, go back to the “Environment Variable” window and select “Path” under the System variable. Then click on the “Edit” button.

Step 6: Here, you need to add the JAVA_HOME variable to the Path. For that, click on “New” and type %JAVA_HOME%\bin to add the new environment variable. After that, click on “OK” to save the changes.

How to Verify JAVA_HOME Variable

By following; the above steps, you can set the JAVA_HOME variable on your system. Now, to verify the JAVA_HOME environment variable, follow the below steps:

Step 1: Click the “Start” button, search for “cmd,” and open the command prompt as administrator.

Step 2: Now run the following command:

This command should print the directory of the Java JDK to which the JAVA_HOME is pointing. Or else, you will get an empty line if the JAVA_HOME variable is not configured correctly.

Step 3: Next, run the javac —version command; to check the version of the Java compiler.

If everything went fine, that means; you have successfully set the JAVA_HOME on Windows 11. Now, you are ready to run Java files on your Windows operating system.

Conclusion

That’s it; this is how you can set the JAVA_HOME variable on Windows 11. If you want to run and write Java code, you can also check out our detailed guide on; how to install and set up Eclipse IDE on Windows 11 for Java programming.

I hope this article was helpful to you. If you liked the article, share it with your friends and family. If you have some suggestions, do not hesitate to leave them in the comments section below.

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Java install windows java home