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Gradle Jdk Automanagement

gradle-jdks manages now also the JDK used to run Gradle. This means, when you run ./gradlew <task> or open a Gradle project in IntelliJ (using the palantir-gradle-jdk Intellij plugin), the correct JDKs will be downloaded and used even if you have no JDK preinstalled. The exact same version of the JDK would run in all environments. The system root certs would also be inserted into the JDKs' truststore.

Usage

  1. First, you must apply the plugin. In the root project, Either use the new plugin syntax:
plugins {
   id 'com.palantir.jdks' version '<latest version>'
}

or the old buildscript method:

buildscript {
   repositories {
      mavenCentral()
   }
   
   dependencies {
      classpath 'com.palantir.gradle.jdks:gradle-jdks:<latest-version>'
   }
}

apply plugin: 'com.palantir.jdks'
  1. We need to apply the com.palantir.jdks.settings plugin in settings.gradle file:
  buildscript {
      repositories {
          mavenCentral() { metadataSources { mavenPom(); ignoreGradleMetadataRedirection() } }
          gradlePluginPortal() { metadataSources { mavenPom(); ignoreGradleMetadataRedirection() } }
          mavenLocal()
      }
  
      dependencies {
          classpath 'com.palantir.gradle.jdks:gradle-jdks-settings:<latest-version>'
      }
  }
  
  apply plugin: 'com.palantir.jdks.settings'
  1. Next up comes configuring the JDKs plugin. Palantirians: you probably shouldn't use this setup directly - either use gradle-jdks-latest for OSS or gradle-jdks-internal for internal projects which will set everything up for you.
jdks {
   // Required: For each Java major version you use, you need to specify
   //           a distribution and version.
   jdk(11) {
      distribution = 'azul-zulu'
      jdkVersion = '11.54.25-11.0.14.1'
   }
   
   jdk(17) {
      distribution = 'amazon-corretto'
      jdkVersion = '17.0.3.6.1'
   }
   
   // You can also individually specify different versions per OS and arch
   jdk(21) {
      distribution = 'amazon-corretto'
      jdkVersion = '21.0.2.13.1'
      
      // OS options are linux-glibc, linux-musl, macos, windows
      os('linux-glibc') {
         jdkVersion = '21.0.2.14.1'
       
         // arch options are x86, x86-64, aarch64
         arch('aarch64') {
            jdkVersion = '21.0.2.14.2'
         }     
      }
   }
   
   // Optional: For each distribution, you can set a base url for a
   //           mirror to use instead of the default public mirror.
   // Default:  Whatever mirror is publicly provided by the vendor
   jdkDistribution('azul-zulu') {
      baseUrl = 'https://internal-corporate-mirror/azul-zulu-cdn-mirror'
   }
   
   // Optional: Where to store the JDKs on disk. You almost certainly
   //           do not need to change this. 
   // Default:  $HOME/.gradle/gradle-jdks
   jdkStorageLocation = System.getProperty("user.home") + '/custom/location'
}
  1. Next, set the gradle daemon major Jdk version in the root project build.gradle
jdks {
    daemonTarget = <version eg. 11/17/21>
}
  1. Enable the jdk setup by adding the following to gradle.properties:
palantir.jdk.setup.enabled=true
  1. Run the following to configure the Gradle entry points to use the JDK setup:
./gradlew setupJdks

The commands above will trigger the tasks:

  • generateGradleJdkConfigs which generates in the project's gradle/ a list of files and directories that configure the JDK versions and distributions and gradle-daemon-jdk-version. See more about the generated structure of the directories here. These files will need to be committed to the git repo.
  • wrapperJdkPatcher which patches the ./gradlew script to run ./gradle/gradle-jdks-setup.sh
  • setupJdks is calling the patched ./gradlew(.bat) javaToolchains script to install and configure the JDKs and check the configured toolchains:

The output should look like:

Starting a Gradle Daemon (subsequent builds will be faster)

> Task :javaToolchains

+ Options
  | Auto-detection:     Disabled
  | Auto-download:      Disabled

+ Amazon Corretto JDK 11.0.23+9-LTS
  | Location:           /Users/crogoz/.gradle/gradle-jdks/amazon-corretto-11.0.23.9.1-d6ef2c62dc4d4dd4
  | Language Version:   11
  | Vendor:             Amazon Corretto
  | Architecture:       aarch64
  | Is JDK:             true
  | Detected by:        Gradle property 'org.gradle.java.installations.paths'

+ Amazon Corretto JDK 17.0.11+9-LTS
  | Location:           /Users/crogoz/.gradle/gradle-jdks/amazon-corretto-17.0.11.9.1-f0e4bf13f7416be0
  | Language Version:   17
  | Vendor:             Amazon Corretto
  | Architecture:       aarch64
  | Is JDK:             true
  | Detected by:        Gradle property 'org.gradle.java.installations.paths'

Note that Auto-detection and Auto-download options should be both disabled and the list of toolchains should only be retrieved from the Gradle property 'org.gradle.java.installations.paths'. Note that now, when running any ./gradlew the following line would show up if a specific JDK isn't installed on the host:

JDK installation '/.gradle/gradle-jdks/amazon-corretto-11.0.23.9.1-d6ef2c62dc4d4dd4' does not exist, installing 'https://corretto.....' in progress ...
  1. [Intellij] Install the Intellij plugin palantir-gradle-jdks and restart Intellij. The plugin will automatically configure the Gradle JVM to use the JDK setup by the com.palantir.jdks plugin.

Intellij Gradle JDK setup

  • Gradle JVM is set to #GRADLE_LOCAL_JAVA_HOME which is resolved by Intellij to the java.home set in .gradle/config.properties.
  • The java.home is set to the Gradle JDK Daemon resolved path which is resolved from the gradle/gradle-daemon-jdk-version file.
  • When opening a Project in Intellij with the Gradle JDK setup enabled, a tab will appear at the bottom Gradle JDK Setup which will call the gradle/gradle-jdks-setup.sh script

Gradle JDK Configuration directory structure

The Gradle JDK configuration will be rendered automatically by ./gradlew generateGradleJdkConfigs in a directory format structure as it needs to be easily parsed both from Bash and from Java (see Entry points)

DO NOT MANUALLY CHANGE THE FILES, it may break the JDK setup workflow. Instead, please update the JdksExtension or update the gradle-jdks-latest version.

project-root/
├── gradle/
│   ├── wrapper/
│   │   ├── gradle-wrapper.jar
│   │   ├── gradle-wrapper.properties
│   ├── jdks/
│   │   ├── <jdkMajorVersion eg.11>/
│   │   │   ├── <os eg. linux>/
│   │   │   │   ├── <arch eg. aarch64>/
│   │   │   │   │   ├── download-url
│   │   │   │   │   ├── local-path
│   ├── gradle-daemon-jdk-version
│   ├── gradle-jdks-setup.sh
│   ├── gradle-jdks-functions.sh
│   ├── gradle-jdks-setup.jar
├── subProjects/...
  • gradle/gradle-daemon-jdk-version
    • contains the Gradle JDK Daemon version rendered from JdksExtension#daemonTarget
  • gradle/jdks
    • contains a list of directories in the format <jdk_major_version>/<os>/<arch> that contain 2 files:
      • download-url full url path for the jdk, os and arch. Rendered from JdksExtension#jdks configured in step 2
      • local-path the local name of the file. Rendered based on the distribution-name, version and the hash
    • it generates all the JDK versions configured in JdksExtension

Running the patched ./gradlew script will add extra configurations required for IntelliJ:

project-root/
├── .gradle/
│   ├── config.properties
  • .gradle/config.properties - sets up java.home to the gradle JDK daemon path.

How it works ?

There are 2 main entry points for running Gradle. Both of these would need to support installing/using the specified JDK.

  • ./gradlew(.bat) script
  • Running a Gradle build from inside Intellij

Supporting Gradle JDK auto-management from ./gradlew scripts

The ./gradlew script is the main entry point for running Gradle builds. It is a shell script that downloads the Gradle wrapper jar and runs it with a JDK. The script is generated by the gradle-wrapper plugin and is stored in the gradle/wrapper directory of the project. We are modifying the ./gradlew script to use the JDK setup by patching it using the scripts: gradlew-patch.sh and gradle-jdks-setup.sh. The patching is done by the wrapperJdkPatcher task.. The patch script does the following:

  • downloads all the JDKs that are configured in the gradle/jdks directory see above the dirctory structure
  • delegates to gradle-jdks-setup.jar (setup class) the installation of the JDKS and the system certs.
  • sets the gradle property org.gradle.java.home to the installation path of the JDK configured in gradle/gradle-daemon-jdk-version. Hence, ./gradlew will retrieve this java installation and it will run the wrapper using this java installation.

Running a Gradle build from inside Intellij

IntelliJ doesn't use the ./gradlew script, instead it uses the Gradle Tooling API. The Intellij plugin palantir-gradle-jdks will:

  • run the gradle jdks setup script: ./gradle/gradle-jdks-setup.sh before any Gradle Task and before the idea project is configured.
  • set the Gradle JVM version to the Gradle local java home (GRADLE_LOCAL_JAVA_HOME which is resolved from the gradle/gradle-daemon-jdk-version file).

ToolchainsPlugin tasks

The new workflow is set up by ToolchainsPlugin which gets applied if palantir.jdk.setup.enabled=true. The plugin won't apply the baseline-java-versions plugin anymore, allowing for the configuration of the Java Toolchains as described in the Gradle docs

The plugin registers the following tasks:

  • wrapperJdkPatcher - finalizes the wrapper task such that everytime ./gradlew file is updated, it will also be patched
  • checkWrapperJdkPatcher - checks that the ./gradlew script contains the expected JDKs setup patch
  • generateGradleJdkConfigs - generates the gradle/ configurations required for running the JDKs setup
  • checkGradleJdkConfigs - checks that all the gradle/ configurations are up-to-date. E.g. if the jdks-latest plugin is updated, we need to make sure the gradle/jdks files reflect the jdk versions.
  • setupJdks - task that triggers wrapperJdkPatcher and generateGradleJdkConfigs and runs the patched ./gradlew script.

Unsupported

  • This workflow is disabled on Windows at the moment.
  • We only support Java language Versions specifications >= 11 (see gradle-jdks-setup/build.gradle javaVersion specifications).
  • We only support Gradle versions >= 7.6