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Original : https://intellij-support.jetbrains.com/hc/en-us/articles/206544879-selecting-the-jdk-version-the-ide-will-run-under?page=3

 

 

Windows

JDK (JetBrains Runtime) is bundled with all the product installers and it's recommended that you will use the provided JDK version unless there are any specific issues. Since 2017.1 version 64-bit JDK is bundled by default on all the systems (32-bit JDK can be downloaded on Windows by the installer if needed).

JetBrains Runtime (based on OpenJDK) can be also downloaded separately, but you normally don't need to do it. 

<product>.exe uses this JDK search sequence:

  1. IDEA_JDK / PHPSTORM_JDK / WEBIDE_JDK / PYCHARM_JDK / RUBYMINE_JDK / CLION_JDK / DATAGRIP_JDK environment variable (depends on the product, WEBIDE_JDK applies to both WebStorm and PhpStorm before version 2016.1)

  2. idea.config.path\<product>.jdk file
  3. ..\jre directory
  4. system Registry
  5. JDK_HOME environment variable
  6. JAVA_HOME environment variable

<product>64.exe uses this JDK search sequence:

  1. IDEA_JDK_64/ PHPSTORM_JDK_64 / WEBIDE_JDK_64 / PYCHARM_JDK_64 / RUBYMINE_JDK_64 / CLION_JDK_64 / DATAGRIP_JDK_64 environment variable
  2. idea.config.path\<product>64.jdk file
  3. ..\jre64 directory
  4. system Registry
  5. JDK_HOME environment variable
  6. JAVA_HOME environment variable

It’s also possible to start the IDE with <product>.bat file located in the bindirectory, it uses the following JDK search sequence:

  1. IDEA_JDK / PHPSTORM_JDK / WEBIDE_JDK / PYCHARM_JDK / RUBYMINE_JDK / CLION_JDK / DATAGRIP_JDK environment variable (depends on the product)
  2. idea.config.path\<product>64.jdk file
  3. idea.config.path\<product>.jdk file
  4. ..\jre64 directory
  5. ..\jre directory
  6. JDK_HOME environment variable
  7. JAVA_HOME environment variable
Environment variable must point to the JDK installation home directory, for example:
c:\Program Files (x86)\Java\jdk1.8.0_112
  • The actual JDK version used by the IDE can be verified in Help | Aboutdialog (open any project to access the menu).
  • Define IDEA_JDK / PHPSTORM_JDK / WEBIDE_JDK / PYCHARM_JDK / RUBYMINE_JDK/ CLION_JDK / DATAGRIP_JDK variable depending on the product to override the default version from IDE_HOME\jre.
  • Use Rapid Environment Editor to add/edit the variables, it will detect incorrect paths.
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