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The following are the system requirements for installing the JDK and the JRE on macOS:

  • Any Intel-based computer running macOS.

  • Administrator privileges.

    You cannot install Java for a single user. Installing the JDK and JRE on macOS is performed on a systemwide basis for all users. Administrator privileges are required to install the JDK and JRE on macOS.

  • When you install the JDK, it also installs the JRE. However, the system will not replace the current JRE with a lower version.

    To determine the current JRE version installed on your system, see Determining the JRE Version Installed on macOS. To install an earlier version of the JRE, you must first uninstall the current version. See Uninstalling the JRE on macOS.

  • When you install the JRE, you can install only one JRE on your system at a time. The system will not install a JRE that has an earlier version than the current version.

    To determine the current JRE version installed on your system, see Determining the JRE Version Installed on macOS. To install an earlier version of the JRE, you must first uninstall the current version. See Uninstalling the JRE on macOS.

    Note:

    Installing a JRE from Oracle will not update java -version symlinks or add java to your path. To do this, you must install the JDK.

A Software Development Kit, or an SDK, is a collection of tools that you need to develop an application for a specific software framework. For example, to develop applications in Java, you need a Java SDK (JDK). SDKs contain binaries, source code for the binaries, and documentation for the source code. JDK builds also contain annotations.

Sdk

Generally, SDKs are global. It means that one SDK can be used in multiple projects and modules. After you create a new project and define an SDK for it, you can configure modules in this project to inherit its SDK. You can also specify an SDK for each module individually. For more information, refer to Change module SDK.

Supported SDKs:

Define an SDK

To define an SDK means to let IntelliJ IDEA know in which folder on your computer the necessary SDK version is installed. This folder is called an SDK home directory.

Configure global SDKs

  1. From the main menu, select File Project Structure Platform Settings SDKs.

  2. To add an SDK, click , select the necessary SDK and specify its home directory in the dialog that opens.

    Only for JDKs: if you don't have the necessary JDK on your computer, select Download JDK. In the next dialog, specify the JDK vendor, version, change the installation path if required, and click Download.

Set up a project SDK

  1. From the main menu, select File Project Structure Project Settings Project.

  2. If the necessary SDK is already defined in IntelliJ IDEA, select it from the Project SDK list.

    If the SDK is installed on your computer, but not defined in the IDE, select Add SDK 'SDK name', and specify the path to the SDK home directory.

    Only for JDKs: If you don't have the necessary JDK on your computer, select Add SDK Download JDK. In the next dialog, specify the JDK vendor, version, change the installation path if required, and click Download.

Set up a module SDK

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  1. From the main menu, select File Project Structure Project Settings Modules.

  2. Select the module for which you want to set an SDK and click Dependencies.

  3. If the necessary SDK is already defined in IntelliJ IDEA, select it from the Module SDK list.

    If the SDK is installed on your computer, but not defined in the IDE, select Add SDK 'SDK name', and specify the path to the SDK home directory.

    Only for JDKs: If you don't have the necessary JDK on your computer, select Add SDK Download JDK. In the next dialog, specify the JDK vendor, version, change the installation path if required, and click Download.

If you want a module to inherit a project SDK, select the Project SDK option from the Module SDK list.

Java Development Kit (JDK)

To develop applications in IntelliJ IDEA, you need a Java SDK (JDK). A JDK is a software package that contains libraries, tools for developing and testing Java applications (development tools), and tools for running applications on the Java platform (Java Runtime Environment — JRE).

The JRE can be obtained separately from the JDK, but it's not suitable for application development, as it doesn't have essential components such as compilers and debuggers.

  • The bundled JRE is used for running the IDE itself, and it's not sufficient for developing Java applications. Before you start developing in Java, download and install a standalone JDK build.

  • Due to the changes in the Oracle Java License, you might not have the rights to use Oracle's Java SE for free. We recommend that you use one of the OpenJDK builds to avoid potential compliance failures.

In IntelliJ IDEA, you can download a JDK package right from the IDE, or you can manually download the necessary JDK distribution and define it in the IDE.

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For a manual download, use any available distribution that you like, for example:

If you don't know which distribution to choose, and you don't have specific requirements that instruct you to use one of the existing distributions, use Oracle OpenJDK.

Set up the project JDK

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  1. From the main menu, select File Project Structure Project Settings Project.

  2. If the necessary JDK is already defined in IntelliJ IDEA, select it from the Project SDK list.

    If the JDK is installed on your computer, but not defined in the IDE, select Add SDK JDK, and specify the path to the JDK home directory (for example, /Library/Java/JavaVirtualMachines/jdk-12.0.1.jdk).

    If you don't have the necessary JDK on your computer, select Add SDK Download JDK. In the next dialog, specify the JDK vendor, version, change the installation path if required, and click Download.

  3. Apply the changes and close the dialog.

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If you build your project with Maven or Gradle, refer to Change the JDK version in a Maven project and Gradle JVM selection respectively for more information on how to work with JDKs.

Specify SDK documentation paths

External documentation opens the necessary information in a web browser, so that you can navigate to related symbols and keep the information for further reference at the same time. After you configure external documentation for your project, you can also view it in a quick documentation popup.

Configure the external documentation path

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To view external documentation, you need to configure the documentation URL first.

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  1. In the Project Structure dialog Ctrl+Alt+Shift+S, select SDKs.

  2. Select the necessary SDK version if you have several SDKs configured, and open the Documentation Path tab on the right.

  3. Click the icon and enter the external documentation URL. For example, for Java 14, type https://docs.oracle.com/en/java/javase/14/docs/api/).

  4. Apply the changes and close the dialog.

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For more information on how to open external documentation and how to work with it offline, refer to External documentation.