How to Configure a Specific JDK Version for Gradle Builds?

Configuring Specific JDK Version in Gradle

Enforcing the use of a specific JDK version in a Gradle build ensures consistency and compatibility. To achieve this, several approaches are available:

Using Gradle Properties

In the .gradle directory under your user's home directory, create or modify the gradle.properties file. Add the following line:

org.gradle.java.home=/path_to_jdk_directory

Replace /path_to_jdk_directory with the path to the desired JDK installation.

Customizing compileJava Task

Alternatively, you can override the JDK version within the compileJava task in the build.gradle script:

compileJava.options.fork = true
compileJava.options.forkOptions.executable = '/path_to_javac'

Replace /path_to_javac with the path to the JDK's javac executable.

Setting JAVA_HOME Environment Variable

If you prefer using environment variables, you can set JAVA_HOME to point to your desired JDK before running the Gradle build:

export JAVA_HOME=/path_to_jdk_directory

This method is not optimal because it requires manual intervention and is not tracked by Gradle, which can lead to configuration inconsistencies.

Which Solution to Choose?

The first method, using gradle.properties, is convenient and allows for defining the JDK version globally for all Gradle builds in your system.

The second method, customizing compileJava, provides more control and isolation as it only affects your project's build.

Finally, setting JAVA_HOME is a quick solution but lacks flexibility and requires additional manual steps.

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