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IntelliJ IDEA Community Edition

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IntelliJ IDEA Community Edition official JetBrains project

These instructions will help you build IntelliJ IDEA Community Edition from source code, which is the basis for IntelliJ Platform development. The following conventions will be used to refer to directories on your machine: *

<user_home></user_home>

is your home directory. *

<idea_home></idea_home>

is the root directory for the IntelliJ source code. *

<jdk_18_home></jdk_18_home>

is the root directory for the 1.8 JDK.

Getting IntelliJ IDEA Community Edition Source Code

IntelliJ IDEA Community Edition source code is available from

github.com/JetBrains/intellij-community

by either cloning or downloading a zip file (based on a branch) into

<idea_home></idea_home>

. The default is the master branch.

The master branch contains the source code which will be used to create the next major version of IntelliJ IDEA. The branch names and build numbers for older releases of IntelliJ IDEA can be found on the page ofBuild Number Ranges.

If you intend to make open-source contributions to the IntelliJ Platform, see Contributing to the IntelliJ Project for more information.

Speed Tip: If the complete repository history isn't needed then using a shallow clone (

git clone --depth 1

) will save significant time.

These Git operations can also be done through the IntelliJ IDEA user interface.

IntelliJ IDEA Community Edition requires additional Android modules from separate Git repositories. To clone these repositories, run one of the

getPlugins

scripts located in the

<idea_home></idea_home>

directory. These scripts clone their respective master branches. *

getPlugins.sh

for Linux or macOS. *

getPlugins.bat

for Windows.

Note: Always

git checkout

the

intellij-community

and

android

Git repositories to the same branches/tags.

Building IntelliJ Community Edition

Version 2020.1 or newer of IntelliJ IDEA Community Edition or IntelliJ IDEA Ultimate Edition is required to build and develop for the IntelliJ Platform.

Opening the IntelliJ Source Code for Build

Using IntelliJ IDEA File | Open, select the

<idea_home></idea_home>

directory. * If IntelliJ IDEA displays an error about a missing or out of date required plugin (e.g. Kotlin), enable, upgrade, or install that plugin and restart IntelliJ IDEA. * If IntelliJ IDEA displays an error about a Gradle configuration not found, refresh the Gradle projects.

IntelliJ Build Configuration

JDK version 1.8 and JDK version 11 are required for building and developing for IntelliJ IDEA Community Edition. 1. Using IntelliJ IDEA, configure a JDK named "1.8", pointing to

<jdk_18_home></jdk_18_home>

. The JDK should be of version 1.8.0_162 or newer; also it must include jfxrt.jar. You may use for example Oracle JDK or Amazon Corretto (the latter can be downloaded directly from Project Structure dialog). * If not already present, add `<JDK_18_HOME>/lib/tools.jar

[to the Classpath](https://www.jetbrains.com/help/idea/sdk.html#manage\_sdks) tab for the \*\*1.8\*\* JDK. 2. Configure a JDK named "\*\*corretto-11\*\*", pointing to installation of JDK 11. It's recommended to use Amazon Corretto JDK. You may [download it directly](https://www.jetbrains.com/help/idea/sdk.html#jdk-from-ide) from Project Structure dialog. 3. Also configure a JDK named "\*\*IDEA jdk\*\*" (case sensitive), pointing to installation of JDK 1.6. If you don’t want to install JDK 1.6 then you may configure \*\*IDEA jdk\*\* to point to

<JDK_18_HOME>`. However, you must be careful to avoid using Java 8 APIs in IntelliJ IDEA Community Edition modules that use IDEA jdk. * If not already present, add the corresponding path for tools.jar to the Classpath for "IDEA jdk" JDK. 4. If the _Maven Integration_ plugin is disabled, add the path variable "MAVEN_REPOSITORY" pointing to

<user_home>/.m2/repository</user_home>

directory. 5. Speed Tip: If you have enough RAM on your computer, configure the compiler settings to enable the "Compile independent modules in parallel" option. Also, set the "User-local build process VM options" to

-Xmx2G

. These changes will greatly reduce the compile time.

Building the IntelliJ Application Source Code

To build IntelliJ IDEA Community Edition from source, choose Build | Build Project from the main menu.

To build installation packages, run the

ant

command in

<idea_home></idea_home>

directory. See the

build.xml

file for details.

Running IntelliJ IDEA

To run the IntelliJ IDEA built from source, choose Run | Run from the main menu. This will use the preconfigured run configuration "IDEA".

To run tests on the build, apply these setting to the Run | Edit Configurations... | Templates | JUnit configuration tab: * Working dir:

<idea_home>/bin</idea_home>

* VM options: *

-ea

*

-Djava.system.class.loader=com.intellij.util.lang.UrlClassLoader

*

-Didea.config.path=../test-config

*

-Didea.system.path=../test-system

You can find other helpful information at http://www.jetbrains.org. The contribute section of that site describes how you can contribute to IntelliJ IDEA.

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