I was getting the below error while installing the Maven plugin - mvn clean install
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project test: Error extracting plugin descriptor: 'Goal: validate already exists in the plugin descriptor for prefix: test
Existing implementation is: test.MyMojo
Conflicting implementation is: test.MyMojo'
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:213)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:51)
The configurations are below
MyMojo.java
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
/**
* Goal which validate the content.
* @goal validate
* @phase VERIFY
*/
@Mojo (name="validate", defaultPhase=LifecyclePhase.VERIFY, requiresProject=false )
public class MyMojo extends AbstractMojo
{
@Parameter (property="message", defaultValue="Default Message")
private String message;
public void execute() throws MojoExecutionException
{
System.console().writer().println(message);
}
}
Pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>test</artifactId>
<packaging>maven-plugin</packaging>
<version>1.0-SNAPSHOT</version>
<name>test Maven Mojo</name>
<url>http://maven.apache.org</url>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>3.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-tools</groupId>
<artifactId>maven-plugin-annotations</artifactId>
<version>3.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-core</artifactId>
<version>3.2.5</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
* Goal which validate the content.
* @goal validate
* @phase VERIFY
*/
@Mojo (name="validate", defaultPhase=LifecyclePhase.VERIFY, requiresProject=false )
The deployment is success after removing the @goal validate from the java annotation.
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
/**
* Goal which validate the content.
* @phase VERIFY
*/
@Mojo (name="validate", defaultPhase=LifecyclePhase.VERIFY, requiresProject=false )
public class MyMojo extends AbstractMojo
{
@Parameter (property="message", defaultValue="Default Message")
private String message;
public void execute() throws MojoExecutionException
{
System.console().writer().println(message);
}
}
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