Maven is not using Java 11: error message "Fatal error compiling: invalid target release: 11"

Maven is not using Java 11: error message "Fatal error compiling: invalid target release: 11"

The error message "Fatal error compiling: invalid target release: 11" indicates that Maven is attempting to compile your project using a Java version lower than 11, and it's encountering an issue because your project is configured to target Java 11.

To resolve this issue and ensure that Maven compiles your project using Java 11, follow these steps:

  1. Check Your Java Version: Make sure you have Java 11 or a later version installed on your system. You can check your Java version by running the following command in your terminal or command prompt:

    java -version

    If you don't have Java 11 installed, you'll need to download and install it from the official Oracle or OpenJDK website.

  2. Specify the Java Version in Your Maven Configuration: You can specify the Java version to be used for your Maven project by configuring the <properties> section in your project's pom.xml file. Add the following lines to your pom.xml:

    <properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

    This sets both the source and target versions to Java 11.

  3. Check Your IDE Configuration: If you are using an integrated development environment (IDE) like Eclipse or IntelliJ IDEA, make sure that your IDE is also configured to use Java 11 for your project. Check the IDE settings and project settings to verify that the correct Java version is selected.

  4. Clean and Rebuild: After making these changes, try running a clean build of your project with Maven:

    mvn clean install

    This will ensure that your project is compiled using Java 11.

  5. Check System Environment Variables: Ensure that your system's JAVA_HOME environment variable is set to the correct Java 11 installation directory. Maven uses this variable to determine which Java version to use.

  6. Use the Toolchains Plugin (Optional): If you need to use different Java versions for different projects or modules, you can use the Apache Maven Toolchains Plugin to configure the Java version on a per-project basis. However, this is usually not necessary for most projects.

By following these steps, you should be able to configure Maven to use Java 11 successfully and resolve the "invalid target release: 11" error.

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