Detailed explanation of how Maven sets the Java version

How Maven sets the Java version

Maven is a powerful project management tool for building, dependency management and deployment of Java projects. When using Maven to build a project, you usually need to ensure that the project uses a specific version of Java to ensure compilation and execution compatibility. This article will detail how to set the Java version through Maven and provide specific code examples.

1. Set the Java version in the POM file

The Java version in the Maven project can be set in the pom.xml filemaven-compiler-plugin Plug-in to specify. In the plugin configuration, you can set the source and target parameters to specify the desired Java version. The following is an example configuration example of setting the Java version to 1.8 in the pom.xml file:

<project>
   ...
   <properties>
      <maven.compiler.source>1.8</maven.compiler.source>
      <maven.compiler.target>1.8</maven.compiler.target>
   </properties>
   ...
   <build>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.0</version>
            <configuration>
               <source>1.8</source>
               <target>1.8</target>
            </configuration>
         </plugin>
      </plugins>
   </build>
   ...
</project>

In the above configuration, by setting maven.compiler.source and the maven.compiler.target property is 1.8, and source and ## are set in the configuration of the maven-compiler-plugin plugin #target are all 1.8 to ensure that the project is compiled using Java 1.8 version.

2. Configure environment variables

In addition to setting the Java version in

pom.xml, you can also specify the Java version used by the Maven project by configuring environment variables. The required Java path can be specified by setting the JAVA_HOME environment variable in the MAVEN_HOME/bin/mvn file. Specific operations include:

Open the
• MAVEN_HOME/bin/mvn file
Add the following code at the beginning of the file:

export JAVA_HOME=/path/to/java-1.8

3 . Set the Java version in the command line

When using the Maven command line to build the project, you can also specify the required Java version directly in the command. The Java version can be set by adding the

-Dmaven.compiler.source=1.8 -Dmaven.compiler.target=1.8 parameter after the mvn command. Example:

mvn clean install -Dmaven.compiler.source=1.8 -Dmaven.compiler.target=1.8

Conclusion

Through the above three methods, you can easily set the required Java version in the Maven project. Whether by setting and configuring environment variables in the

pom.xml file, or directly specifying them on the command line, you can ensure that the project is compiled and executed using the specified Java version. It is recommended to choose the most suitable setting method based on actual needs to ensure the stability and compatibility of the project.

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