How to set specific Java version to Maven

Question

On my machine I have two Java versions installed   1 6 and 1 7 installed manually by me    I need both of them for different projects  But for Maven I need 1 7  but my Maven uses the 1 6 Java version  How can I set Maven to use 1 7

User · Answer

I just recently  after seven long years with Maven  learned about toolchains xml  Maven has it even documented and supports it from 2 0 9 - toolchains documentation   So I added a toolchain xml file to my    m2  folder with following content    lt toolchains xmlns  http   maven apache org TOOLCHAINS 1 1 0  xmlns xsi  http   www w3 org 2001 XMLSchema-instance   xsi schemaLocation  http   maven apache org TOOLCHAINS 1 1 0 http   maven apache org xsd toolchains-1 1 0 xsd  gt    lt  -- JDK toolchains -- gt    lt toolchain gt      lt type gt jdk lt  type gt      lt provides gt        lt version gt 1 8 lt  version gt        lt vendor gt sun lt  vendor gt      lt  provides gt      lt configuration gt        lt jdkHome gt  opt java8 lt  jdkHome gt      lt  configuration gt    lt  toolchain gt    lt toolchain gt      lt type gt jdk lt  type gt      lt provides gt        lt version gt 1 7 lt  version gt        lt vendor gt sun lt  vendor gt      lt  provides gt      lt configuration gt        lt jdkHome gt  opt java7 lt  jdkHome gt      lt  configuration gt    lt  toolchain gt   lt  toolchains gt    It allows you to define what different JDKs Maven can use to build the project irrespective of the JDK Maven runs with  Sort of like when you define JDK on project level in IDE

User · Answer

Maven uses the JAVA HOME parameter to find which Java version it is supposed to run  I see from your comment that you can t change that in the configuration     You can set the JAVA HOME parameter just before you start maven  and change it back afterwards if need be    You could also go into your mvn non-windows  mvn bat mvn cmd windows  and set your java version explicitly there

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On Linux Unix  the JAVA HOME within  mvn  shell script is overridden by the settings in   HOME  mavenrc   please Where to add JAVA HOME and MAVEN path variables in linux

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Without changing Environment Variables  You can manage java version based on the project level by using Maven Compiler Plugin   Method 1   lt properties gt       lt maven compiler source gt 1 7 lt  maven compiler source gt       lt maven compiler target gt 1 7 lt  maven compiler target gt   lt  properties gt   lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-maven-plugin lt  artifactId gt           lt  plugin gt       lt  plugins gt   lt  build gt    Method 2   lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-compiler-plugin lt  artifactId gt               lt configuration gt                   lt source gt 1 7 lt  source gt                   lt target gt 1 7 lt  target gt               lt  configuration gt           lt  plugin gt       lt  plugins gt   lt  build gt

User · Answer

Also you can have two versions of maven installed  and edit one of them  editing here      mvn non-windows  mvn bat mvn cmd windows     replacing your  java home  appearances to your java desired path  Then just execute maven from that modified path

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To avoid any impact to your project and to your Environment Variables  you can configure the Maven Compiler Plugin just to the project s POM  specifying the Source and Target java version      lt plugins gt       lt plugin gt           lt artifactId gt maven-compiler-plugin lt  artifactId gt           lt version gt 3 5 1 lt  version gt           lt configuration gt               lt source gt 1 7 lt  source gt               lt target gt 1 7 lt  target gt           lt  configuration gt       lt  plugin gt             lt  plugins gt

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In the POM  you can set the compiler properties  e g  for 1 8    lt project gt        lt properties gt       lt maven compiler source gt 1 8 lt  maven compiler source gt       lt maven compiler target gt 1 8 lt  maven compiler target gt     lt  properties gt       lt  project gt

User · Answer

On windows  I just add multiple batch files for different JDK versions to the Maven bin folder like this    mvn11 cmd   echo off setlocal set  JAVA HOME path to jdk11  set  path  JAVA HOME   path   mvn      then you can use mvn11 to run Maven in the specified JDK

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I did not have success on mac with just setting JAVA HOME in the console but I was successful with this approach   Create  mavenrc file at your at your home directory   so the file will path will be    mavenrc Into that file paste export JAVA HOME    usr libexec java home -v 1 7

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Adding my two cents and explicitly providing the solution   I have two JDKs installed on my Windows Machine - JDK 1 5 and JDK 1 6   My default  and set to windows system environment variable  JAVA HOME is set to JDK 1 5   However  I have a maven project that I need to build  i e   JBehave Tutorial s Etsy com  using JDK 1 6   My solution in this scenario  which worked    is as suggested by  DanielBarbarian to set it in mvn bat    For some not familiar with window s batch file  I just basically added the set JAVA HOME  lt path to other jdk gt  line after  REM      START VALIDATION      in mvn bat  i e    MAVEN HOME  bin mvn bat     REM      START VALIDATION      set JAVA HOME C  Program Files Java jdk1 6 0 45 jre if not   JAVA HOME         goto OkJHome

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You can set Maven to use any java version following the instructions below   Install jenv in your machine link  Check the available java versions installed in your machine by issuing the following command in command line      jenv versions   You can specify global Java version using the following command      jenv global oracle64-1 6 0 39   You can specify local Java version for any directory Project  using the following command in the directory in command line      jenv local oracle64-1 7 0 11   add the correct java version in your pom xml  if you are running maven in command line install jenv maven plugin using below command     jenv enable-plugin maven   Now you can configure any java version in your machine to any project with out any trouble

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On Macs   assuming you have the right version installed    JAVA HOME   usr libexec java home -v 1 8  mvn clean install -DskipTests

User · Answer

You could configure compiling sources using different JDK with maven-compiler-plugin    Just specify path to javac in  lt executable gt  tag  E g for java11 it looks like    lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 3 8 0 lt  version gt       lt configuration gt           lt source gt 11 lt  source gt           lt target gt 11 lt  target gt           lt fork gt true lt  fork gt           lt executable gt C  Program Files Java jdk-11 0 1 bin javac lt  executable gt   lt  --PATH TO JAVAC -- gt       lt  configuration gt   lt  plugin gt

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I ve used the base idea from  Jonathan  I ve set the windows with  set JAVA HOME C  Program Files java AdoptOpenJDK-11 0 8 10 call mvn clean package -DskipTests

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On windows   If you do not want to change your JAVA HOME variable inside the system variables   Edit your mvn bat file and add a line like this  set JAVA HOME C  Program Files Java jdk1 7 0 45 jre   This can be done after  REM      START VALIDATION      like mentionned by  Jonathan  On Mac   amp  Linux     If you do not want to change your JAVA HOME variable inside your    bashrc or    bash profile  you can create a    mavenrc file and redefine your JAVA HOME using the java home tool  export JAVA HOME   usr libexec java home -v 1 7 0 45    Sanity Check  You can verify that everything is working fine by executing the following commands  The jdk version should be different   mvn -version  then  java -version

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Adding a solution for people with multiple Java versions installed We have a large codebase  most of which is in Java  The majority of what I work on is written in either Java 1 7 or 1 8  Since JAVA HOME is static  I created aliases in my  bashrc for running Maven with different values  alias mvn5  quot JAVA HOME  usr local java5  amp  amp  mvn quot  alias mvn6  quot JAVA HOME  usr local java6  amp  amp  mvn quot  alias mvn7  quot JAVA HOME  usr local java7  amp  amp  mvn quot  alias mvn8  quot JAVA HOME  usr local java8  amp  amp  mvn quot   This lets me run Maven from the command line on my development machine regardless of the JDK version used on the project   Edit  A better solution is presented by the answer from Ondrej  which obviates remembering aliases

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One simple solution to the problem -     JAVA HOME  usr lib jvm java-6-sun  mvn clean install   On Mac  it would look something like -      JAVA HOME  Library Java JavaVirtualMachines jdk1 7 0 21 jdk Contents Home   mvn clean install   PS  One special case that i found is the above given command does not work on  fish  shell  I also had bash shell available and it worked fine there  just use command  bash  to switch to bash shell

[maven] How to set specific Java version to Maven

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