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Tutorials > Maven > Creating your own plugins

Creating your own plugins

Creating custom plugins in Maven allows you to extend its functionality and automate repetitive tasks specific to your project or organization. Here's an example of how to create a simple custom Maven plugin:

  • Create a new Maven project with the "maven-archetype-plugin" archetype:
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mvn archetype:generate -DgroupId=com.example.maven.plugins -DartifactId=my-maven-plugin -DarchetypeArtifactId=maven-archetype-plugin

This will create a new Maven project with the directory structure and files needed to build a plugin.

  • Define a Mojo (Maven goal) by creating a Java class in the project's source directory (src/main/java). The Java class should extend the "AbstractMojo" class and use the appropriate annotations to specify its parameters and behavior. For example, here's a simple Mojo that prints a message to the console:
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@Mojo(name = "hello", defaultPhase = LifecyclePhase.COMPILE)
public class HelloMojo extends AbstractMojo {

  @Parameter(defaultValue = "World", property = "name", required = true)
  private String name;

  public void execute() throws MojoExecutionException {
    getLog().info("Hello, " + name + "!");
  }
}

This Mojo has a single parameter, "name", which is used in the message it prints to the console.

  • Build and install the plugin to your local Maven repository with the following command:
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mvn clean install

This will create a JAR file for your plugin and install it in your local Maven repository.

  • Use the plugin in a project by adding it to the project's POM file and invoking its Mojo(s) with the appropriate parameters. For example, to use the "hello" Mojo in a project, you would add the following to your POM file:
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<build>
  <plugins>
    <plugin>
      <groupId>com.example.maven.plugins</groupId>
      <artifactId>my-maven-plugin</artifactId>
      <version>1.0-SNAPSHOT</version>
      <executions>
        <execution>
          <phase>compile</phase>
          <goals>
            <goal>hello</goal>
          </goals>
        </execution>
      </executions>
      <configuration>
        <name>Bob</name>
      </configuration>
    </plugin>
  </plugins>
</build>

This configuration specifies that the "hello" Mojo should be executed during the "compile" phase of the build, with a "name" parameter of "Bob". When you run the Maven build for your project, the "hello" Mojo will be executed and print a message to the console.

Custom plugins in Maven can be more complex than this example and can include multiple Mojos, complex parameter configurations, and additional functionality, but this simple example should give you an idea of the basic structure and process involved.



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