How to change maven java home

How to change maven java home

To change the Java home (JDK or JRE) that Maven uses, you can set the JAVA_HOME environment variable or configure it in your Maven settings.xml file. Here are the steps for both methods:

Method 1: Setting JAVA_HOME Environment Variable

  1. Open a terminal or command prompt.

  2. Determine the path to your desired JDK or JRE installation directory. This should be the directory where your Java installation is located.

  3. Set the JAVA_HOME environment variable to the path of your JDK or JRE installation directory. Replace "YOUR_JAVA_HOME_PATH" with the actual path to your Java installation:

    • On Windows:

      set JAVA_HOME=YOUR_JAVA_HOME_PATH

    • On macOS or Linux:

      export JAVA_HOME=YOUR_JAVA_HOME_PATH

    You can also set the JAVA_HOME permanently in your system environment variables so that it persists across sessions.

  4. Verify that JAVA_HOME is correctly set by running the following command:

    echo %JAVA_HOME% # On Windows echo $JAVA_HOME # On macOS or Linux

    It should display the path to your Java installation.

Method 2: Configuring JAVA_HOME in Maven settings.xml

  1. Locate your Maven settings.xml file. It is typically located in the conf directory of your Maven installation ($M2_HOME/conf/settings.xml) or in your user's .m2 directory (~/.m2/settings.xml).

  2. Open the settings.xml file in a text editor.

  3. Inside the <settings> element, add a <profiles> section if it doesn't already exist. Then, add a <profile> with a <properties> element specifying the JAVA_HOME property and the path to your JDK or JRE installation directory. Replace "YOUR_JAVA_HOME_PATH" with the actual path to your Java installation:

    <profiles> <profile> <id>custom-java-home</id> <properties> <JAVA_HOME>YOUR_JAVA_HOME_PATH</JAVA_HOME> </properties> </profile> </profiles>

  4. Save the settings.xml file.

  5. To activate this profile, you can either use the -P command-line option when running Maven or specify it in your project's pom.xml file.

    • Using the -P command-line option:

      mvn -Pcustom-java-home clean install

    • In your project's pom.xml file, you can include the following configuration within the <build> or <profiles> section:

      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.1</version> <!-- Use your desired version --> <configuration> <fork>true</fork> <executable>${JAVA_HOME}/bin/javac</executable> </configuration> </plugin> </plugins> </build>

    Using either method, Maven will use the specified JAVA_HOME when executing builds.

By following one of these methods, you can change the Java home that Maven uses for compiling and running your projects.

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