How do I tell Gradle to use specific JDK version?

Question

I can\'t figure out to get this working.

Scenario:

• I have an application built with gradle
• The application uses JavaFX

What I w

Answer 1

If you just want to set it once to run a specific command:

JAVA_HOME=/usr/lib/jvm/java-11-oracle/ gw build

Answer 2

So, I use IntelliJ for my Android project, and the following solved the issue in the IDE:

just cause it might save someone the few hours I wasted... IntelliJ -> Preferences -> Build, Execution, Deployment -> Build tools -> Maven -> Gradle

and set Gradle JVM to 1.8 make sure you also have JDK 8 installed...

NOTE: the project was compiling just fine from the command line

Answer 3

If you are using linux and gradle wrapper you can use following solution.

Add path to local.properties file:

javaHome=<path to JDK>

Add to your gradlew script file:

DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
source $DIR/local.properties 2>/dev/null

if ! [ -z "$javaHome" ]
then
  JAVA_HOME=$javaHome
fi

In this solution, each developer can set his own JDK path. File local.properties shouldn't be included in version control system.

Answer 4

there is a Gradle plugin that download/bootstraps a JDK automatically:

https://plugins.gradle.org/plugin/com.github.rmee.jdk-bootstrap

No IDE integration yet and a decent shell required on Windows.

Answer 5

Android Studio

File > Project Structure > SDK Location > JDK Location >

/usr/lib/jvm/java-8-openjdk-amd64

GL

Install JDK

Answer 6

To people ending up here when searching for the Gradle equivalent of the Maven property maven.compiler.source (or <source>1.8</source>):

In build.gradle you can achieve this with

apply plugin: 'java'
sourceCompatibility = 1.8
targetCompatibility = 1.8

See the Gradle documentation on this.