Custom Maven plugin issue with local dependencies












0















I developed my own (very simple) custom Maven plugin following this guide.



All it does is execute my own project's Main class after running a specific goal.



When I run mvn install on my plugin, I get a NullPointerException on the maven-plugin-plugin:descriptor goal. It is important to mention that this doesn't happen if I add the dependency with a <systemPath> absolute path, adding the <scope>system</scope> option.



Stack trace:



[ERROR] Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.: NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
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)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:145)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
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)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
Caused by: java.lang.NullPointerException
at org.objectweb.asm.Type.getObjectType (Unknown Source)
at org.apache.maven.tools.plugin.annotations.scanner.visitors.MojoClassVisitor.visit (MojoClassVisitor.java:108)
at org.objectweb.asm.ClassReader.accept (Unknown Source)
at org.objectweb.asm.ClassReader.accept (Unknown Source)
at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scanFile (DefaultMojoAnnotationsScanner.java:139)
at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scan (DefaultMojoAnnotationsScanner.java:85)
at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.scanAnnotations (JavaAnnotationsMojoDescriptorExtractor.java:125)
at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.execute (JavaAnnotationsMojoDescriptorExtractor.java:104)
at org.apache.maven.tools.plugin.scanner.DefaultMojoScanner.populatePluginDescriptor (DefaultMojoScanner.java:108)
at org.apache.maven.plugin.plugin.AbstractGeneratorMojo.execute (AbstractGeneratorMojo.java:233)
at org.apache.maven.plugin.plugin.DescriptorGeneratorMojo.execute (DescriptorGeneratorMojo.java:92)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
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)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)


My plugin's pom.xml:



<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.example</groupId>
<artifactId>example-maven-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>maven-plugin</packaging>

<build>
<plugins>
<plugin>
<groupId>com.example</groupId>
<artifactId>example-maven-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>

<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>3.0</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-tools</groupId>
<artifactId>maven-plugin-annotations</artifactId>
<version>3.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.example</groupId>
<artifactId>myexample</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>


What I've tried is manually installing my project with mvn install:install-file following this small guide.










share|improve this question





























    0















    I developed my own (very simple) custom Maven plugin following this guide.



    All it does is execute my own project's Main class after running a specific goal.



    When I run mvn install on my plugin, I get a NullPointerException on the maven-plugin-plugin:descriptor goal. It is important to mention that this doesn't happen if I add the dependency with a <systemPath> absolute path, adding the <scope>system</scope> option.



    Stack trace:



    [ERROR] Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.: NullPointerException -> [Help 1]
    org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
    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)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
    Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:145)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
    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)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
    Caused by: java.lang.NullPointerException
    at org.objectweb.asm.Type.getObjectType (Unknown Source)
    at org.apache.maven.tools.plugin.annotations.scanner.visitors.MojoClassVisitor.visit (MojoClassVisitor.java:108)
    at org.objectweb.asm.ClassReader.accept (Unknown Source)
    at org.objectweb.asm.ClassReader.accept (Unknown Source)
    at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scanFile (DefaultMojoAnnotationsScanner.java:139)
    at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scan (DefaultMojoAnnotationsScanner.java:85)
    at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.scanAnnotations (JavaAnnotationsMojoDescriptorExtractor.java:125)
    at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.execute (JavaAnnotationsMojoDescriptorExtractor.java:104)
    at org.apache.maven.tools.plugin.scanner.DefaultMojoScanner.populatePluginDescriptor (DefaultMojoScanner.java:108)
    at org.apache.maven.plugin.plugin.AbstractGeneratorMojo.execute (AbstractGeneratorMojo.java:233)
    at org.apache.maven.plugin.plugin.DescriptorGeneratorMojo.execute (DescriptorGeneratorMojo.java:92)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:134)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
    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)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)


    My plugin's pom.xml:



    <?xml version="1.0" encoding="UTF-8"?>
    <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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>example-maven-plugin</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>maven-plugin</packaging>

    <build>
    <plugins>
    <plugin>
    <groupId>com.example</groupId>
    <artifactId>example-maven-plugin</artifactId>
    <version>1.0-SNAPSHOT</version>
    </plugin>
    <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
    <source>8</source>
    <target>8</target>
    </configuration>
    </plugin>
    </plugins>
    </build>

    <dependencies>
    <dependency>
    <groupId>org.apache.maven</groupId>
    <artifactId>maven-plugin-api</artifactId>
    <version>3.0</version>
    </dependency>
    <dependency>
    <groupId>org.apache.maven.plugin-tools</groupId>
    <artifactId>maven-plugin-annotations</artifactId>
    <version>3.4</version>
    <scope>provided</scope>
    </dependency>
    <dependency>
    <groupId>com.example</groupId>
    <artifactId>myexample</artifactId>
    <version>1.0-SNAPSHOT</version>
    </dependency>
    </dependencies>
    </project>


    What I've tried is manually installing my project with mvn install:install-file following this small guide.










    share|improve this question



























      0












      0








      0








      I developed my own (very simple) custom Maven plugin following this guide.



      All it does is execute my own project's Main class after running a specific goal.



      When I run mvn install on my plugin, I get a NullPointerException on the maven-plugin-plugin:descriptor goal. It is important to mention that this doesn't happen if I add the dependency with a <systemPath> absolute path, adding the <scope>system</scope> option.



      Stack trace:



      [ERROR] Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.: NullPointerException -> [Help 1]
      org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
      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)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
      at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
      at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
      at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
      at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke (Method.java:498)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
      Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
      at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:145)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
      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)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
      at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
      at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
      at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
      at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke (Method.java:498)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
      Caused by: java.lang.NullPointerException
      at org.objectweb.asm.Type.getObjectType (Unknown Source)
      at org.apache.maven.tools.plugin.annotations.scanner.visitors.MojoClassVisitor.visit (MojoClassVisitor.java:108)
      at org.objectweb.asm.ClassReader.accept (Unknown Source)
      at org.objectweb.asm.ClassReader.accept (Unknown Source)
      at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scanFile (DefaultMojoAnnotationsScanner.java:139)
      at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scan (DefaultMojoAnnotationsScanner.java:85)
      at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.scanAnnotations (JavaAnnotationsMojoDescriptorExtractor.java:125)
      at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.execute (JavaAnnotationsMojoDescriptorExtractor.java:104)
      at org.apache.maven.tools.plugin.scanner.DefaultMojoScanner.populatePluginDescriptor (DefaultMojoScanner.java:108)
      at org.apache.maven.plugin.plugin.AbstractGeneratorMojo.execute (AbstractGeneratorMojo.java:233)
      at org.apache.maven.plugin.plugin.DescriptorGeneratorMojo.execute (DescriptorGeneratorMojo.java:92)
      at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:134)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
      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)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
      at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
      at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
      at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
      at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke (Method.java:498)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)


      My plugin's pom.xml:



      <?xml version="1.0" encoding="UTF-8"?>
      <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/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>

      <groupId>com.example</groupId>
      <artifactId>example-maven-plugin</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>maven-plugin</packaging>

      <build>
      <plugins>
      <plugin>
      <groupId>com.example</groupId>
      <artifactId>example-maven-plugin</artifactId>
      <version>1.0-SNAPSHOT</version>
      </plugin>
      <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <configuration>
      <source>8</source>
      <target>8</target>
      </configuration>
      </plugin>
      </plugins>
      </build>

      <dependencies>
      <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-plugin-api</artifactId>
      <version>3.0</version>
      </dependency>
      <dependency>
      <groupId>org.apache.maven.plugin-tools</groupId>
      <artifactId>maven-plugin-annotations</artifactId>
      <version>3.4</version>
      <scope>provided</scope>
      </dependency>
      <dependency>
      <groupId>com.example</groupId>
      <artifactId>myexample</artifactId>
      <version>1.0-SNAPSHOT</version>
      </dependency>
      </dependencies>
      </project>


      What I've tried is manually installing my project with mvn install:install-file following this small guide.










      share|improve this question
















      I developed my own (very simple) custom Maven plugin following this guide.



      All it does is execute my own project's Main class after running a specific goal.



      When I run mvn install on my plugin, I get a NullPointerException on the maven-plugin-plugin:descriptor goal. It is important to mention that this doesn't happen if I add the dependency with a <systemPath> absolute path, adding the <scope>system</scope> option.



      Stack trace:



      [ERROR] Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.: NullPointerException -> [Help 1]
      org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor (default-descriptor) on project gentest-maven-plugin: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
      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)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
      at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
      at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
      at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
      at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke (Method.java:498)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
      Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed.
      at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:145)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
      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)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
      at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
      at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
      at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
      at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke (Method.java:498)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
      Caused by: java.lang.NullPointerException
      at org.objectweb.asm.Type.getObjectType (Unknown Source)
      at org.apache.maven.tools.plugin.annotations.scanner.visitors.MojoClassVisitor.visit (MojoClassVisitor.java:108)
      at org.objectweb.asm.ClassReader.accept (Unknown Source)
      at org.objectweb.asm.ClassReader.accept (Unknown Source)
      at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scanFile (DefaultMojoAnnotationsScanner.java:139)
      at org.apache.maven.tools.plugin.annotations.scanner.DefaultMojoAnnotationsScanner.scan (DefaultMojoAnnotationsScanner.java:85)
      at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.scanAnnotations (JavaAnnotationsMojoDescriptorExtractor.java:125)
      at org.apache.maven.tools.plugin.annotations.JavaAnnotationsMojoDescriptorExtractor.execute (JavaAnnotationsMojoDescriptorExtractor.java:104)
      at org.apache.maven.tools.plugin.scanner.DefaultMojoScanner.populatePluginDescriptor (DefaultMojoScanner.java:108)
      at org.apache.maven.plugin.plugin.AbstractGeneratorMojo.execute (AbstractGeneratorMojo.java:233)
      at org.apache.maven.plugin.plugin.DescriptorGeneratorMojo.execute (DescriptorGeneratorMojo.java:92)
      at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:134)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
      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)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
      at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
      at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
      at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
      at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke (Method.java:498)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)


      My plugin's pom.xml:



      <?xml version="1.0" encoding="UTF-8"?>
      <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/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>

      <groupId>com.example</groupId>
      <artifactId>example-maven-plugin</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>maven-plugin</packaging>

      <build>
      <plugins>
      <plugin>
      <groupId>com.example</groupId>
      <artifactId>example-maven-plugin</artifactId>
      <version>1.0-SNAPSHOT</version>
      </plugin>
      <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <configuration>
      <source>8</source>
      <target>8</target>
      </configuration>
      </plugin>
      </plugins>
      </build>

      <dependencies>
      <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-plugin-api</artifactId>
      <version>3.0</version>
      </dependency>
      <dependency>
      <groupId>org.apache.maven.plugin-tools</groupId>
      <artifactId>maven-plugin-annotations</artifactId>
      <version>3.4</version>
      <scope>provided</scope>
      </dependency>
      <dependency>
      <groupId>com.example</groupId>
      <artifactId>myexample</artifactId>
      <version>1.0-SNAPSHOT</version>
      </dependency>
      </dependencies>
      </project>


      What I've tried is manually installing my project with mvn install:install-file following this small guide.







      java maven






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jan 2 at 21:05









      DavidPostill

      104k25225260




      104k25225260










      asked Jan 2 at 21:02









      Lucas RangoLucas Rango

      1




      1






















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          0














          Solved. Added the following snippet to my pom.xml (won't work with 3.4 version).



              <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-plugin-plugin</artifactId>
          <version>3.5</version>
          </plugin>





          share|improve this answer























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            1 Answer
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            active

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            active

            oldest

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            active

            oldest

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            0














            Solved. Added the following snippet to my pom.xml (won't work with 3.4 version).



                <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-plugin-plugin</artifactId>
            <version>3.5</version>
            </plugin>





            share|improve this answer




























              0














              Solved. Added the following snippet to my pom.xml (won't work with 3.4 version).



                  <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-plugin-plugin</artifactId>
              <version>3.5</version>
              </plugin>





              share|improve this answer


























                0












                0








                0







                Solved. Added the following snippet to my pom.xml (won't work with 3.4 version).



                    <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-plugin-plugin</artifactId>
                <version>3.5</version>
                </plugin>





                share|improve this answer













                Solved. Added the following snippet to my pom.xml (won't work with 3.4 version).



                    <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-plugin-plugin</artifactId>
                <version>3.5</version>
                </plugin>






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Jan 3 at 13:46









                Lucas RangoLucas Rango

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