How to set java path linux

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Не знаете как установить переменные JAVA_HOME и PATH для каждого пользователя в соответствии с вашей системой Linux? Тогда эта статья «Установка переменных JAVA_HOME / PATH в Linux» именно для Вас. Я напишу ее в качестве заметки, чтобы потом быстренько вспомнить и прописать Java_Home и Path на ОС для каждого пользователя ( если понадобится).

Установка переменных JAVA_HOME / PATH в Unix/Linux

/ .bash_profile является сценарий запуска, который обычно выполняется один раз. Это конкретный файл используется для команд, которые выполняются, когда нормальные входе пользователя в систему. Common использует для .bash_profile должны установить переменные окружения, такие как PATH, JAVA_HOME, чтобы создать псевдонимы для команд оболочки, и установить права доступа по умолчанию для вновь создаваемых файлов.

Установка JAVA_HOME / PATH для одного пользователя

Зайдите в свой аккаунт (учетную запись) и откройте файл .bash_profile в любом редакторе:

Установите JAVA_HOME как показано используя синтаксис export JAVA_HOME=

. Если ваш путь такой как у меня /usr/lib/jvm/java-1.6.0-openjdk-i386/bin/java, то тогда пропишите:
export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-i386/bin/java

Чтобы установить PATH пропишите:

Замените путь /usr/java/jdk1.5.0_07 на свой. Сохраните и закройте файл. Просто выйдите и зайдите обратно (перелогиньетсь), чтобы увидеть изменения или чтобы все изменения вступили в силу, выполните команду:

Чтобы проверить отображение новых настроек, используйте команды:

Совет: Используйте следующую команду, чтобы узнать точный путь Java под UNIX / Linux:

Пожалуйста, обратите внимание, что файл

/.bashrc похож на

/.bash_profile но работает только для оболочки Bash и .bashrc работает для каждой новой Bash оболочки.

Установка JAVA_HOME / PATH для всех пользователей

Вам нужно добавить строки в глобальный файл конфигурации в /etc/profile ИЛИ /etc/bash.bashrc чтобы внести изменения для всех пользователей:

Добавьте переменные PATH / JAVA_PATH следующим образом:

Сохраните и закройте файл. Еще раз вам нужно ввести следующую команду, чтобы немедленно активировать настройки:

Но если не будет работать, есть еще 1 способ прописать все это дело! Сейчас я покажу как это можно сделать.

1. Устанавливаем переменные среды:

2. Выполните команду чтобы перезапустить все только что прописанные настройки:

3. Тест, если среда Java успешно установлена, введите команду в терминале чтобы проверить работу:

Установка переменных JAVA_HOME / PATH в Unix/Linux завершена.

One thought on “ Установка переменных JAVA_HOME / PATH в Unix/Linux ”

Спасибо за гайд, работает как часы. Первых пунктов до bash_profile включительно хватило. Версия х64. Пути и названия свои. Проверил еще javac -version. Вопрос к автору. Где эту информацию искать на сайте оракла?

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How To Set Java Home Path In Linux?

Java is a popular programming language and framework in the IT industry. There are a lot of applications developed with Java. Java requires Java Development Kit to develop applications. Compiled java applications can run on systems those are installed Java Runtime Environment a.k.a JRE. We will look in this post on how to set and check JRE or JDK or Java Home Path.

Installation

There are two main different versions of JDK and JRE. The original vendor is Oracle which distributes and sets standards of Java. Second is an open version of JDK and JRE that are supported by Oracle. In this post, we will install the open version named as openjdk-9-jre-headless .

Installation

Check Java Status

We will look if java path already sets simple running java command which is a compiler for Java applications.

Check Java Status

Update Locate Database

This is auxiliary operation to use locate OpenJDK location we update locate database

Find JDK Location

We will look at where is JDK located and also get the JDK version. This operation can be used Oracle JDK too. Just the JDK directory name will be different.

Find JDK Location

Set Java Home

As we see there is a lot of output for JDK search we can see that the path of JDK is /usr/lib/jvm/java-9-openjdk-amd64 because it is located in usr lib. Now we will set PATH for Java

Set Java Home

Make Java Home Configuration Persistent

The previous step makes JAVA HOME available for subshells but if the system is restarted the path will be lost. So we need to make this path definition persistent. There are different methods to make persistent. We will look single and simple one. We will add path definition to the system-wide environment definition configuration. This operation requires root privileges.

An alternative method without the need for root privileges is adding Java home path definition to the normal user .bashrc file like below.

Make Java Home Configuration Persistent

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How to Set JAVA_HOME Path in Ubuntu 18.04 and 20.04 LTS

A large number of Java-based programs require Java Runtime Environment (JRE) to run smoothly regardless of operating systems. For development purposes, most IDEs like Eclipse and NetBeans require Java Development Kit (JDK) installed on the machine. Whether you are a newbie developer looking forward to learning development or perhaps an application you have installed requires you to have Java installed on your system, we have you covered. Setting up of JAVA_HOME path is quite easy.

In this tutorial, we are going to learn how to install JDK on Ubuntu 18.04 and 20.04 and then set up the java home path. Let’s start by installing the JDK first.

Install OpenJDK on Ubuntu

Note: Make sure that you have updated the Advanced Package Tool (APT) before you move forward to install OpenJDK.

Press Ctrl + Alt + T to open the terminal and enter the following command mentioned in the box. You can either install OpenJDK 8 or the newer versions OpenJDK 11 or OpenJDK 14:

Install OpenJDK 8

Install OpenJDK 11

Install OpenJDK 14

You will be prompted to enter your sudo password to continue with the installation.

Once you’ve entered that, wait for the system to finish the installation and then move onto step 2.

Set JAVA_HOME Path

All you have to do now is to set the “JAVA_HOME” and “PATH” environment variables and then you are done. Enter the following commands to set your environment variables. Make sure that your environment variables point to a valid installation of JDK on your machine. For Ubuntu 18.04, the path is /usr/lib/jvm/java-8-openjdk-amd64/

To check whether your JAVA_HOME path has been successfully saved, enter the following command to check.

The value stored in the JAVA_HOME variable will be displayed on the terminal as you can see in the screenshot

Add JAVA bin directory to the PATH variable

Like we have added JAVA_HOME path, we will now update the PATH variable as well. To do that, enter the following command on the terminal.

This will append the java bin directory to the existing PATH variable. You can also check the PATH variable by entering the following command Advertisement

Test JAVA setup

You have successfully installed OpenJDK on your machine. You can verify your installation by entering the following command on your terminal.

Through this simple tutorial, you have now configured the JAVA_HOME variable in your operating system. You can now easily run java based applications as well as development environments on your machine. Let us know in comments if you faced any issues while implementing this tutorial.

Karim Buzdar

About the Author: Karim Buzdar holds a degree in telecommunication engineering and holds several sysadmin certifications. As an IT engineer and technical author, he writes for various web sites. You can reach Karim on LinkedIn

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How to set JAVA_HOME and PATH in Linux? Example

Like in the previous article, I explained a Maven issue (invalid target release: 1.7, 1.8) related to the Java version, which occurred even though the correct version of Java was installed on the machine, but JAVA_HOME was pointing to an older version.

Unfortunately, When you install Java on Linux or Windows, this environment variable is not set automatically. You need to do it yourself. Java developers like me always set mandatory environment variables like JAVA_HOME, PATH, and CLASSPATH on the login scripts executed by the shell when you log in to Linux like bash_profile.sh , but you can also set JAVA_HOME into /etc/profile for all users.

I’ll show you steps on how to find the location of Java and how to set up the JAVA_HOME in Linux in this article, and these steps should also work with any Linux or Java version like Ubuntu, RedHat, CentOS, SUSE, ArchLinux, Debian, Fedora, etc.

Though I strongly encourage every Java developer to learn Linux, it’s a really important skill and serves you for a long time. If you decide to improve your Linux skill this year, I suggest you take a look at these best online Linux courses, which are both short and sweet and also explains all important details.

1. Steps to set JAVA_HOME in Linux

1) The first step is to find the location where Java is installed on your Linux machine. To check that open putty and connect to your Linux server and type the following command

where options include:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
-server to select the «server» VM

It means Java is installed and added to your PATH, so half of the job is done already. All you need to is find the location of JDK, which you can find either by printing PATH as follows

You can see that JDK is installed on «/usr/sun/jdk/v1.6.0_16-64bit».

2) Add the following line of your .bash_profile file if you want to set JAVA_HOME for yourself or /etc/profile if you want to set JAVA_HOME for all user

That’s it you are done. Though don’t forget to open another shell window by typing bash , csh , or ksh . The new environment variable will not be added to an existing shell, you need to open a new shell window.

Also, if you use bash shell then adding into

/.bash_profile makes sense, if you use csh (C shell) then add JAVA_HOME into

/.csh_profile, and similarly for ksh (K shell) add JAVA_HOME into

They are hidden files in your home directory in Linux, that’s why they had prefix dot (.) in their name. You can use «ls — alrt» command to see them.

Here is a sample /etc/profile file with JAVA_HOME and PATH variable defined for your reference:

By the way, if you don’t see Java installed on your machine, then download the Linux version of Java from Oracle’s website and install it.

Once you are done with installation just find the folder where JDK is installed and follow the steps given above to set JAVA_HOME for your Linux environment.

For applications, JAVA_HOME is generally referred to on the start script. It’s bad practice to refer to the hardcoded path of Java installation in scripts, you will never find Tomcat, Maven, Eclipse, NetBeans, or IntelliJ doing that because then when you update to a new Java version they won’t be able to use it until you change their start script.

Using JAVA_HOME makes it easy to switch to a different or new Java version. See these free Java development courses to learn more about the core concepts of Java in detail. It’s updated for Java 11 and also not very expensive, I just bouthbought11 a couple of days ago.

2. Why should you set JAVA_HOME in Linux

Even though many developers know about JAVA_HOME, they don’t set it in their environment due to various reasons. I strongly recommend you to set JAVA_HOME , PATH , and CLASSPATH for your development environment. Here are some reasons why you set JAVA_HOME in Linux

1) It’s easy to upgrade JDK without affecting your application startup and config file, which points to JAVA_HOME . You just need to download a new version and make sure your JAVA_HOME points to the new version of Java. This is the best benefit of using an environment variable or links.

2) The JAVA_HOME variable is short and concise instead of the full path to the JDK installation directory.

3) JAVA_HOME variable helps your program achieve platform independence like if your startup script uses JAVA_HOME, then it can run on Windows and UNIX without any modification; you just need to set JAVA_HOME on the respective operating system.

4) The JAVA_HOME is standard, which means other tools that need Java, like Maven, Eclipse can refer to this variable without having any knowledge of where Java is physically installed on your machine, which is obviously different in different user’s machines. JAVA_HOME allows everybody to access Java in a common and standard way.

I also suggest joining Java Fundamentals: The Java Language course on Pluaralsight to learn more about Java fundamentals like this one.

That’s all about how to set the JAVA_HOME environment variable in Linux. I have also touched base on why you should do it, which is probably more important. Many tools like Maven and IDEs like Eclipse and Netbeans use this variable to locate the JDK binaries installed on this machine, hence it’s better to set this up. If you face any problem while setting and using the JAVA_HOME environment variable, feel free to ask. I’ll be glad to help you out.

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