Как установить java sdk

These installation instructions describe how to install Java Platform, Enterprise Edition 8 SDK and Java Platform, Enterprise Edition 8 Web Profile SDK. The following topics are discussed:

Contents

Distributions and Their Components

The following distributions are available and include the components listed:

Visit the Java EE 8 SDK Downloads page for more information about each distribution.

Installing the Software

Requirements

Java EE 8 SDK distributions require JDK 8 Update 144 or higher. Oracle recommends using the latest JDK that is available. Please note: Java SE 9 is not supported at this time.

Ensure that the required JDK software is installed on your system and that the JAVA_HOME environment variable points to the JDK installation directory, not the Java Runtime Environment (JRE) software.

Please refer to the Installation Guide for GlassFish Server, OSE for additional details regarding installation of GlassFish, the Java EE Reference Implementation.

To Install the Software

The following procedure describes how to install the SDK distributions using the ZIP file.

Download the distribution file for your platform from the Java EE 8 SDK Downloads page.

Navigate to the directory where you downloaded the file.

The Java EE 8 SDK or Java EE 8 Web Profile SDK is extracted into a new glassfish5 directory under your current directory.

Next Steps and Resources

The following resources in the Java EE 8 SDK and Java EE 8 Web Profile SDK will help you get started with Java EE 8.

The following resources will help you get started with GlassFish Server Open Source Edition and make the most of its capabilities.

Uninstalling the Software

Before you uninstall the software, make sure you have stopped all domains and other related processes, including command prompts using the installation directory or its subdirectories, and any applications using Java SE files.

To stop domains, use the asadmin stop-domain command. For more information about this command, see the GlassFish Server Open Source Edition 5.0 Reference Manual.

If orphaned processes remain, identify and terminate the processes as follows:

Use the Task Manager and terminate the processes using the End Task or End Process buttons.

Источник

9 Installation of the JDK and the JRE on Microsoft Windows Platforms

This topic includes the following sections:

System Requirements for Installing the JDK and the JRE on 64-Bit Windows Platform

The JDK and the JRE have minimum processor, disk space, and memory requirements for 64-bit Windows platform.

Before installing the JDK or the JRE on your 64-bit Windows platform, you must verify that it meets the following minimum processor, disk space, and memory requirements.

Both the JDK and JRE require at minimum a Pentium 2 266 MHz processor.

Disk Space Requirements

Public Java Runtime Environment

When you install 64-bit JDK, then 64-bit public JRE also gets installed. The following table provides the disk requirements for the installed features:

On Windows 64-bit operating systems, the Java runtime requires a minimum of 128 MB of memory.

The minimum physical RAM is required to run graphically based applications. More RAM is recommended for applets running within a browser using the Java Plug-in. Running with less memory may cause disk swapping, which has a severe effect on performance. Very large programs may require more RAM for adequate performance.

JDK and JRE Installation Instruction Notation for Windows

For any text in this document that contains the following notation, you must substitute the appropriate update version number:

JDK Installation Instructions for Windows

You run a self-installing executable file to unpack and install the JDK on Windows computers.

Install JDK on Windows computers by performing the actions described in the following topics:

Downloading the JDK Installer

Verify the successful completion of file download by comparing the file size on the download page and your local drive.

Running the JDK Installer

Installing the JDK Silently

Instead of double-clicking or opening the JDK installer, you can perform a silent, noninteractive, JDK installation by using command-line arguments.

Setting the PATH Environment Variable

It is useful to set the PATH variable permanently for JDK 10 so that it is persistent after rebooting.

The PATH variable is set automatically for the JRE. This topic only applies to the JDK.

If you do not set the PATH variable, then you must specify the full path to the executable file every time that you run it. For example:

The PATH environment variable is a series of directories separated by semicolons (;) and is not case-sensitive. Microsoft Windows looks for programs in the PATH directories in order, from left to right.

You should only have one bin directory for a JDK in the path at a time. Those following the first instance are ignored.

If you are not sure where to add the JDK path, append it.

The new path takes effect in each new command window that you open after setting the PATH variable.

The following is a typical value for the PATH variable:

JRE Installation Instructions for Windows

When installing JRE on Windows computers, you must select the JRE installer that is appropriate for your Windows system.

The 64-bit Windows operating systems come with a 64-bit Internet Explorer (IE) browser as the standard (default) for viewing web pages.

Install JRE on Windows computers by performing the actions described in the following topics:

JRE Proxy Settings and Authentication

To use the Windows Online Installer, you must be connected to the internet.

If you are running behind a proxy server, then you must have your proxy settings correctly configured. If they are not configured, or are incorrectly configured, then the installer will terminate with the following message:

The installer cannot proceed with the current Internet Connection settings.

Please visit the following website for more information.

If you see this message, check your proxy settings:

If you do not know what the correct settings should be, check with your internet provider or system administrator.

Downloading the JRE Installer

The JRE Installer is located on the Java SE Runtime Environment 10 Downloads page.

The following JRE installers are available for you to download:

The Windows Offline installer and Windows installer contains everything that is required to install the JRE.

The Microsoft Windows Installer (MSI) Enterprise JRE Installer is also available, which enables you to install the JRE across your enterprise. It requires a commercial license for use in production.

Running the JRE Installer

Windows Registry Settings

The installation program for the Microsoft Windows version of the Java SE Runtime Environment uses the registry to store path and version information.

It creates the following registry keys:

JavaHome : the full path name of the directory in which the JRE is installed

RuntimeLib : the full path name of the Java runtime DLL

HKEY_LOCAL_MACHINE\Software\JavaSoft\Java Web Start\

This key is created for Java Web Start.

The registry layout for this example is:

The @CurrentVersion is a registry string in the «JDK» or «Java Development Kit» key.

For the same example, if the JRE is installed, then the registry layout is:

The @CurrentVersion is a registry string in the «JRE» or «Java Runtime Environment» key.

Beginning to Use the JDK

Use the Java item in the Windows Start menu to access essential Java information and functions, including Help, API documentation, the Java Control Panel, checking for updates, and Java Mission Control.

Java Start Menu Installed by JDK

During JDK install, Java menu items are added to the Windows Start menu to provide easy access to Java resources and a Java Development Kit folder is created in the Windows Start menu, which contains the following items:

Reference Documentation : Opens the Online API documentation web page.

Java Mission Control : Opens the Java Mission Control profiling and diagnostics tools suite.

Java Mission Control is a commercial feature available to users with a Java SE Advanced license.

During JDK installation and uninstallation processes, the appropriate start menu items are updated so that they are associated with the latest JDK version on the system

Java Start Menu Installed by JRE

During JRE installation, Java menu items are added to the Windows Start menu to provide easy access to Java resources and a Java folder is created in the Windows Start menu, which contains the following items:

About Java : Opens the Java Control Panel with focus on the General tab. The tab displays the latest JRE version installed on the system.

Check for Updates : Opens the Java Control Panel with focus on the Update tab

Configure Java : Opens the Java Control Panel with focus on the General tab

Get Help : Opens the Java Help Center

Visit Java.com : Opens the Java Download page

During JRE installation and uninstallation processes, the appropriate start menu items are updated so that they are associated with the latest JRE version on the system.

Java Web Start

Java Web Start is an application-deployment technology that gives you the power to run full-featured applications with a single click from your web browser.

Upgrading from Previous Versions

If you have a previous version of Java Web Start, do not uninstall it. Uninstalling it will cause the download cache to be cleared, and all previously installed Java Web Start application data will have to be downloaded again. The new version will write over previous installations and automatically update browsers to use the new version. The configuration files and the program files folder used by Java Web Start have changed, but all your settings will remain intact after the upgrade because Java Web Start will translate your settings to the new form.

The only way to uninstall Java Web Start is to uninstall the JDK or JRE. Uninstalling the JDK or JRE will not, however, remove the cache for previous versions of Java Web Start. Previous releases have separate uninstallation instructions for Java Web Start.

You may see a misleading message if you do the following:

Download and cache a Java Web Start application with the JDK or JRE.

When you remove the application, you see an Uninstaller Error dialog box saying:

An error occurred while trying to remove Java-Application: name App. It may have already been uninstalled. Would you like to remove Java-Application: name App from the Add or Remove program list?

If you say Yes to this, then you will see another Uninstaller Error dialog box saying:

You do not have sufficient access to remove Java-Application: name App from the Add or Remove Program list. Please contact your system administrator.

To avoid seeing the misleading message, either press F5 or reopen the dialog box. Any Java Web Start application that was downloaded and cached with the JDK or JRE will no longer appear in the list of currently installed programs.

Java Plug-in

Java Plug-in technology, included as part of the JRE, establishes a connection between popular browsers and the Java platform. This connection enables applets on websites to be run within a browser on the desktop.

The Java Plug-in is automatically enabled for supported web browsers during installation of the JRE. No user intervention is necessary.

Option to Disable the JRE Out-of-Date Warning

When the installed JRE falls below the security baseline or passes its built-in expiration date, an additional warning is shown to users to update their installed JRE to the latest version. For businesses that manage the update process centrally, users attempting to update their JRE individually, may cause problems.

A deployment property, deployment.expiration.check.enabled is available that can be used to disable the JRE out of date warning. To suppress this specific warning message, add the following entry in the deployment properties file:

To disable automatic updates, on the Update tab of the Java Control Panel, deselect the Check for Updates Automatically check box.

Uninstalling the JDK on Windows

Uninstalling the JRE on Windows

Use either of the following ways to uninstall JRE:

Go to Add/Remove Programs utility in the Microsoft Windows Control Panel and uninstall the older versions of JRE.

Remove JRE using the online Java Uninstall Tool.

The Java Removal Tool is integrated with the JRE installer. After JRE 10 is installed, the Java Removal Tool provides the list of outdated Java versions in the system and helps you to remove them.

The Java Uninstall tool will not run if your system administrator specified a deployment rule set in your organization.

A deployment rule set enables enterprises to manage their Java desktop environment directly and continue using legacy business applications in an environment of ever-tightening Java applet and Java Web Start application security policies. A deployment rule set enables administrators to specify rules for applets and Java Web Start applications; these rules may specify that a specific JRE version must be used. Consequently, the Java Uninstall tool will not run if it detects a deployment rule set to ensure that no required JREs are uninstalled.

JDK Installation Troubleshooting

The following sections provide tips for working around problems that are sometimes seen during or while following installation instructions.

System Error During Decompression

Program Cannot Be Run in DOS Mode

Open the MS-DOS shell or command prompt window.

Right-click the title bar.

Select the Program tab.

Ensure that the item Prevent MS-DOS-based programs from detecting Windows is not selected.

Exit the MS-DOS shell.

Restart your computer.

Source Files in Notepad

Characters That Are Not Part of the System Code Page

It is possible to name directories using characters that are not part of the system locale’s code page. If such a directory is part of the installation path, then generic error 1722 occurs, and installation is not completed. Error 1722 is a Windows installer error code. It indicates that the installation process has failed. The exact reason for this error is not known at this time.

To prevent this problem, ensure that the user and system locales are identical, and that the installation path contains only characters that are part of the system locale’s code page. User and system locales can be set in the Regional Options or Regional Settings control panel.

The associated bug number is 4895647.

Windows Online Installation and Java Update FAQ

These are frequently asked questions about JDK 10 and JRE 10 online installation and Java updates on Windows computers.

1. I downloaded the installer and it is less than 1 megabyte. Why is it so small?

The Windows Online Installer for the JRE will download more installer files. Using this installer helps users to avoid downloading unnecessary files.

2. I had the Java Control Panel open for Java Update and the About tab showed the version of the JRE installed in my computer. Then I ran Java Update, and the version of the JRE that the Java Control Panel is showing has not changed. Why is this?

You need to close and restart the Java Control Panel to get the updated Control Panel.

3. Netscape/Mozilla is not working correctly with Java Plug-in. Why?

First, close all the browsers sessions. If this does not work, reboot the system and try again.

4. I try to install on the D:\ drive and Java Update is still installing files onto the C:\ drive. Why?

Regardless of whether an alternate target directory was selected, Java Update needs to install some files on the Windows system drive.

5. How can I uninstall the Java Update version that I just installed?

7. I found the jusched.exe process running in the background of my system after installing JRE. Is there a way to shut it down?

The jusched.exe is the scheduler process of Java Update. This process runs automatically. To shut in the Java Control Panel on the Update tab, deselect the Check for Updates Automatically check box.

8. When I click the Update Now button from the Java Control Panel, it complains about the system being «offline.» What does that mean?

Java Update can be run only if the system is connected to the network. A system that is not connected to the network is referred to as being offline. When the Update Now is clicked, it will check the online/offline status of your system. If your computer does not have internet access, then the error message is displayed. Check that your system is currently connected to the internet and try again.

9. I followed the instructions to install a specific version of the JRE. After the installation, a message is displayed from system tray saying an update is available for download. What should I do?

The message is part of the Java Auto Update mechanism, which detects at user login time if a newer version of the JRE is available for download. In the system tray, click the Java Update icon to download and install the update.

10. I encountered the error «This installation package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer package.» when running the Java SE installer.

There are several possible reasons for this error to be displayed; a few are listed:

Network connection fails.

Download manager software interrupts the download process.

Another application, such as an antivirus application, may interrupt the installation process.

To address these problems, ensure that the third-party downloader applications are turned off and the network connection is configured properly. Also, if a proxy is in use, then ensure that the proxy authentication is turned off.

11. I encountered the error «Error 1722. There is a problem with this Windows installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor.»

See Error 1722: Problem with Windows Installer Package. If you encounter any other errors or issues, then you can access Java Help Center, which contains solutions for issues that you might encounter when downloading and installing Java on your system. In particular, you can search for solutions by error number. Searching for «Error 1722» returns a solution to this issue.

Источник

Как установить JDK и среду разработки IntelliJ IDEA

Начинаем разрабатывать на Java: где взять, как установить и настроить всё, что нужно.

Пройдём через это вместе. Установим JDK в Windows, Ubuntu и macOS, и IntelliJ IDEA тоже в Windows, Ubuntu и macOS. Поехали!

Установка Java Development Kit в Windows

Java Development Kit (JDK) — это комплект ПО для разработчиков приложений на Java. Стандартная установка включает в себя интерпретатор, облегчённый интерпретатор JRE, компилятор, библиотеку Java-классов, отладчик, средства архивации и сжатия jar и другое.

Чтобы установить JDK в Windows, нужно:

Пишет на Java. Верит в Agile. Пьёт много кофе и не любит грязный код.

1. Скачиваем установочный архив

Нам нужна бесплатная версия — AdoptOpenJDK (она есть под Windows, macOS, Ubuntu и другие платформы).

Идём сюда и выбираем версию JDK (актуальны версии 8+), виртуальную Java-машину (JVM) и свою платформу.

Я выбрал OpenJDK 11 ( LTS ), HotSpot и Windows x64 jdk соответственно:

Скачиваем файл по появившейся ссылке (я выделил её жёлтым на скрине выше).

2. Устанавливаем

Извлекаем скачанный архив в папку C:\Program Files\Java\

При этом будет создана подпапка jdk-*номер версии*, а внутри неё появится папка bin.

В результате полный путь до папки bin у меня выглядит так:

3. Настраиваем переменные окружения Windows

Нам нужно создать системную переменную JAVA_HOME, которая будет хранить путь до нашей версии JDK. Это понадобится программам для работы с проектами Java.

Заходим в Панель управления → Система → Дополнительные параметры системы → Дополнительно

А можно и прямо в Панели управления вбить в поиск слово « переменных» (без кавычек). ОС предложит варианты, из которых выбирайте « Изменение системных переменных среды».

У вас откроется окно:

Здесь жмём на кнопку « Переменные сред ы».

В новом окне для раздела « Системные переменные» кликаем « Создать». В « Имя переменной» вводим JAVA_HOME (именно так, латиницей в верхнем регистре), а в поле « Значение переменной» подставляем наш путь C:\Program Files\Java\jdk-*номер версии* :

Далее в разделе « Переменные сред ы…» редактируем системную переменную Path. Нужно добавить в неё путь к папке с исполняемыми файлами Java, а именно: %JAVA_HOME%\bin (соблюдайте регистр символов):

4. Проверяем установку

Запускаем Командную строку Windows. Для этого нажимаем Win + R, а в появившемся окне вводим cmd.exe и жмём на Enter.

Если установка прошла успешно, то ответ покажет версию вашего компилятора:

Установка Java Development Kit в Linux (Ubuntu)

Рассмотрим установку JDK на одном из самых популярных дистрибутивов Linux — Ubuntu 20.04 ( LTS ).

Проще всего установить версию, которая входит в пакет Ubuntu. По умолчанию в Ubuntu 20.04 входит версия Open JDK 11.

1. Проверяем ранее установленные версии

Открываем терминал сочетанием клавиш Ctrl + Alt + T и обновляем базу данных пакетов с помощью APT :

Проверяем ранее установленные версии командой:

Если установка уже выполнялась, то мы увидим что-то такое:

2. Устанавливаем

Для запуска любых приложений Java нужна JRE (Java Runtime Environment — среда выполнения для языка Java). Но для компиляции и разработки программ требуется JDK (Java Development Kit).

Чтобы установить JRE, вводим в консоль:

Для установки JDK — команду:

3. Проверяем установку

Ответ должен выглядеть примерно так:

Установка Java Development Kit в Linux (macOS)

Этот способ установки использует HomeBrew (менеджер недостающих пакетов для macOS).

1. Устанавливаем

Прежде всего нужно добавить репозиторий в HomeBrew. Для этого открываем терминал (Cmd + N) и вводим:

Устанавливаем OpenJDK 11 командой:

2. Проверяем установку

Ответ должен выглядеть примерно так:

Установка среды разработки IntelliJ IDEA Community (Windows)

Intellij IDEA — это интегрированная среда разработки (IDE), то есть система программных средств для создания проектов на разных языках программирования.

Сегодня это самая популярная IDE для языка Java. А ещё есть Eclipse, NetBeans и немало других, но мы рекомендуем именно IDEA, потому что даже её бесплатная версия обладает широкой функциональностью, подходит для профессиональной разработки и вообще делает Java проще в использовании.

В IDE обязательно входят:

1. Какую версию (редакцию) выбрать

Intellij IDEA доступна в бесплатной (Community) и платной (Ultimate) версиях. Чем они различаются, видно на скрине ниже:

Пока что нам хватит возможностей бесплатной версии.

На заметку: IntelliJ предлагает студентам и преподавателям свободный доступ к своим продуктам.

2. Сама установка

Заходим сюда и качаем версию для Windows.

Жмём Next (Далее) и выбираем путь для установки:

Снова Next, и настраиваем параметры установки:

В общем случае это:

Кликаем Next (Далее) и выбираем папку для ярлыков IDEA (оставляем по умолчанию):

Нажимаем Install (Установить), после чего стартует установка:

Дожидаемся её окончания и жмём Finish (Завершить):

3. Запуск IntelliJ IDEA и настройка параметров

При первом запуске принимаем пользовательское соглашение и нажимаем Continue (Продолжить):

Далее выбираем тему оформления (доступны тёмная и светлая):

Жмём Next: Default plugins и переходим к выбору устанавливаемых плагинов:

Если не знаете, что вам точно пригодится, — оставляйте всё как есть. А если, например, с Андроидом вам не работать — выключите соответствующий пункт.

Не волнуйтесь, если надобавляете лишнего или о чём-то забудете. Всё можно будет переиграть — в настройках среды.

После чего нажмите на кнопку Next: featured plugins и выберите другие нужные плагины (или оставляйте всё по умолчанию):

И наконец, нажимаем Start using Intellij IDEA.

Вас встретит начальный экран среды разработки (Welcome screen). Здесь можно создать новый проект, открыть или импортировать существующий, а также скачать проект из системы контроля версий:

Если вы видите такой же экран — поздравляю, установка и настройка прошли успешно! Приятного обучения!

Установка среды разработки IntelliJ IDEA Community (macOS)

Здесь всё даже легче, чем в Windows. Для начала качаем версию для macOS отсюда (о различии между редакциями Community и Ultimate читайте выше — в пункте про установку на Windows):

Копируем файл в « Программы»:

Читаем предупреждение ОС и жмём « Открыть»:

Принимаем пользовательское соглашение и жмём кнопку Continue (Продолжить):

Теперь приложением можно пользоваться. Приятного обучения!

Установка среды разработки IntelliJ IDEA Community (Ubuntu)

Для установки Intellij IDEA открываем Центр приложений Ubuntu:

Вводим в поиск слово « Intellij» (без кавычек). Нам нужна IDEA Community (о различии между редакциями Community и Ultimate читайте выше — в пункте про установку на Windows):

Выбираем версию и нажимаем кнопку Install (Установить):

После установки видим IDEA в меню программ:

Запускаем, принимаем пользовательское соглашение и нажимаем кнопку Continue (Продолжить):

Источник