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JetBrains
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IntelliJ IDEA Community Edition & IntelliJ Platform

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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: *

 is your home directory.
* 
 is the root directory for the IntelliJ source code.

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
. 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 of Build Number Ranges.

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
 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

 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* If IntelliJ IDEA displays an error about a missing or out of date required plugin (e.g. Kotlin),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

  1. Configure a JDK named "corretto-11", pointing to installation of JDK 11. It's recommended to use Amazon Corretto JDK, but other distributions based on OpenJDK should work as well. You may download it directly from Project Structure dialog.
  2. If the Maven Integration plugin is disabled, add the path variable "MAVEN_REPOSITORY" pointing to
    /.m2/repository
    directory.
  3. Speed Tip: If you have enough RAM on your computer, configure the compiler settings to enable the "Compile independent modules in parallel" option. Also, increase build process heap size:

    • if you use IntelliJ IDEA 2020.3 or newer, set "User-local build process heap size" to 2048.
    • if you use IntelliJ IDEA 2020.2 or older, copy value from "Shared build process VM options" to "User-local build process VM options" and add
      -Xmx2G
      to it.

    These changes will greatly reduce compilation 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
 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:

/bin
* VM options: *
-ea
*
-Didea.config.path=../test-config
*
-Didea.system.path=../test-system

You can find other helpful information at https://www.jetbrains.com/opensource/idea. The "Contribute Code" section of that site describes how you can contribute to IntelliJ IDEA.

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