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 want   Use a variable  defined per developer machine  which points to an installation of a JDK which will be used for building the whole application   tests         I thought about having the gradle properties file  defining the variable  Something like  JAVA HOME FOR MY PROJECT  lt path to my desired JDK gt    What I don t want   point JAVA HOME to the desired JDK   I could live with many suggestions    a solution that defines a system environment variable which I m able to check in my build gradle script a variable defined in gradle properties overriding the JAVA HOME variable only for the build context  something like use JAVA HOME  lt my special JDK path defined somewhere else defined gt   something else I didn t think about   Question    How to wire a variable  how ever defined  as variable in the gradle properties  system environment variable       to the build process    I have more than one JDK7 available and need to point to a special version  minimum JDK u version    Any answer is appreciated and I m thankful for every hint to the right direction

User · Answer

If you just want to set it once to run a specific command   JAVA HOME  usr lib jvm java-11-oracle  gw build

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To people ending up here when searching for the Gradle equivalent of the Maven property maven compiler source  or  lt source gt 1 8 lt  source gt     In build gradle you can achieve this with  apply plugin   java  sourceCompatibility   1 8 targetCompatibility   1 8   See the Gradle documentation on this

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If you are executing using gradle wrapper  you can run the command with JDK path like following    gradlew -Dorg gradle java home  jdk path directory

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If you are using JDK 9   you can do this   java       sourceCompatibility   JavaVersion VERSION 1 8     targetCompatibility   JavaVersion VERSION 1 8    tasks withType lt JavaCompile gt        options compilerArgs addAll arrayOf  --release    8        You can also see the following related issues    Gradle   Java 9  Add convenience method for -release compiler argument Eclipse Plug-ins for Gradle  JDK API compatibility should match the sourceCompatibility option

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If you are using linux and gradle wrapper you can use following solution    Add path to local properties file   javaHome  lt path to JDK gt    Add to your gradlew script file   DIR    cd     dirname    BASH SOURCE 0        amp  amp  pwd   source  DIR local properties 2 gt  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

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If you add JDK PATH in gradle properties your build become dependent on on that particular path  Instead Run gradle task with following command line parametemer  gradle build -Dorg gradle java home  JDK PATH   This way your build is not dependent on some concrete path

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For windows run gradle task with jdk 11 path parameter in quotes  gradlew clean build -Dorg gradle java home  c  Program Files Java jdk-11

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You could easily point your desired Java version with specifying in the project level gradle properties  This would effect the current project rather than altering the language level for every project throughout the system  org gradle java home  lt YOUR JDK PATH gt

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There is one more option to follow  In your gradle tasks available in Eclipse  you can set your desired jdk path   I know this is a while since the question was posted  This answer can help someone   Right click on the deploy or any other task and select  quot Open Gradle Run Configuration    quot   Then navigate to  quot Java Home quot  and paste your desired java path   Please note that  bin will be added by the gradle task itself  So don t add the  quot bin quot  to the path

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If you have this problem from Intellij  try this options  Set Gradle JVM Home   Set the JDK version in the Project module settings

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If you are using Kotlin DSL  then in build gradle kts add   tasks withType lt JavaCompile gt        options isFork   true     options forkOptions javaHome   File  C   bin  jdk-13 0 1         Of course  I m assuming that you have Windows OS and javac compiler is in path C  bin jdk-13 0 1 bin javac  For Linux OS will be similarly

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I added this line in my GRADLE HOME bin gradle file -  export JAVA HOME  path to java version

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As seen in Gradle  Eclipse plugin     http   www gradle org get-started     Gradle uses whichever JDK it finds in your path  to check  use java -version   Alternatively  you can set the JAVA HOME environment variable to point to the install directory of the desired JDK       If you are using this Eclipse plugin or Enide Studio 2014  alternative JAVA HOME to use  set in Preferences  will be in version 0 15  see http   www nodeclipse org history

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Two ways  In gradle properties in the  gradle directory in your HOME DIRECTORY set org gradle java home  path to jdk directory  or   In your build gradle  compileJava options fork   true  compileJava options forkOptions executable     path to javac

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I am using Gradle 4 2   Default JDK is Java 9  In early day of Java 9  Gradle 4 2 run on JDK 8 correctly  not JDK 9    I set JDK manually like this  in file  GRADLE HOME  bin gradle bat    if   DEBUG          echo off  rem                                                                             rem  rem  Gradle startup script for Windows  rem  rem                                                                              rem Set local scope for the variables with windows NT shell if   OS     Windows NT  setlocal  set DIRNAME   dp0 if   DIRNAME         set DIRNAME   set APP BASE NAME   n0 set APP HOME  DIRNAME      rem Add default JVM options here  You can also use JAVA OPTS and GRADLE OPTS to pass JVM options to this script  set DEFAULT JVM OPTS    rem Find java exe if defined JAVA HOME goto findJavaFromJavaHome   rem VyDN-start  set JAVA HOME C  Program Files Java jdk1 8 0 144   rem VyDN-end   set JAVA EXE java exe  JAVA EXE  -version  gt NUL 2 gt  amp 1 if   ERRORLEVEL       0  goto init  echo  echo ERROR  JAVA HOME is not set and no  java  command could be found in your PATH  echo  echo Please set the JAVA HOME variable in your environment to match the echo location of your Java installation   goto fail   findJavaFromJavaHome set JAVA HOME  JAVA HOME        rem VyDN-start  set JAVA HOME C  Program Files Java jdk1 8 0 144   rem VyDN-end    set JAVA EXE  JAVA HOME  bin java exe  if exist   JAVA EXE   goto init  echo  echo ERROR  JAVA HOME is set to an invalid directory   JAVA HOME  echo  echo Please set the JAVA HOME variable in your environment to match the echo location of your Java installation   goto fail   init  rem Get command-line arguments  handling Windows variants  if not   OS       Windows NT  goto win9xME args   win9xME args  rem Slurp the command line arguments  set CMD LINE ARGS  set  SKIP 2   win9xME args slurp if  x  1      x  goto execute  set CMD LINE ARGS      execute  rem Setup the command line  set CLASSPATH  APP HOME  lib gradle-launcher-4 2 jar   rem Execute Gradle   JAVA EXE    DEFAULT JVM OPTS   JAVA OPTS   GRADLE OPTS   -Dorg gradle appname  APP BASE NAME   -classpath   CLASSPATH   org gradle launcher GradleMain  CMD LINE ARGS    end  rem End local scope for the variables with windows NT shell if   ERRORLEVEL     0  goto mainEnd   fail rem Set variable GRADLE EXIT CONSOLE if you need the  script  return code instead of rem the  cmd exe  c  return code  if  not         GRADLE EXIT CONSOLE   exit 1 exit  b 1   mainEnd if   OS     Windows NT  endlocal   omega

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Android Studio  File   Project Structure   SDK Location   JDK Location      usr lib jvm java-8-openjdk-amd64   GL  Install JDK

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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 - gt  Preferences - gt  Build  Execution  Deployment - gt  Build tools - gt  Maven - gt  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

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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

[java] How do I tell Gradle to use specific JDK version?

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