[ 
https://issues.apache.org/jira/browse/MNG-6209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16036876#comment-16036876
 ] 

Michael Osipov commented on MNG-6209:
-------------------------------------

You can simply take this 
[IT|https://github.com/apache/maven-plugins/tree/trunk/maven-assembly-plugin/src/it/projects/mojo-configuration/manifest-with-mainClass]
 and invoke as Maven Core IT. The key is about the {{descriptorRef}} this is 
located in the same JAR and the plugin. It could be also on the plugin 
classpath. This classpath is now gone and the descriptor (assembly.xml) cannot 
be loaded:

{noformat}
[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-assembly-plugin:3.0.1-SNAPSHOT:single (assembly) 
on project manifest-with-mainClass: Error reading assemblies: Descriptor with 
ID 'jar-with-dependencies' not found -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal 
org.apache.maven.plugins:maven-assembly-plugin:3.0.1-SNAPSHOT:single (assembly) 
on project manifest-with-mainClass: Error reading assemblies: Descriptor with 
ID 'jar-with-dependencies' not found
        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:937)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:192)
        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.MojoExecutionException: Error reading 
assemblies: Descriptor with ID 'jar-with-dependencies' not found
        at 
org.apache.maven.plugins.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:447)
        at 
org.apache.maven.plugins.assembly.mojos.SingleAssemblyMojo.execute(SingleAssemblyMojo.java:61)
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
        ... 20 more
Caused by: org.apache.maven.plugins.assembly.io.AssemblyReadException: 
Descriptor with ID 'jar-with-dependencies' not found
        at 
org.apache.maven.plugins.assembly.io.DefaultAssemblyReader.addAssemblyForDescriptorReference(DefaultAssemblyReader.java:210)
        at 
org.apache.maven.plugins.assembly.io.DefaultAssemblyReader.readAssemblies(DefaultAssemblyReader.java:125)
        at 
org.apache.maven.plugins.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:443)
        ... 23 more
[ERROR]
{noformat}

Is that enough for an IT for you?

> inconsistent activation of components from multiple extensions=true plugins
> ---------------------------------------------------------------------------
>
>                 Key: MNG-6209
>                 URL: https://issues.apache.org/jira/browse/MNG-6209
>             Project: Maven
>          Issue Type: Bug
>          Components: Class Loading
>    Affects Versions: 3.3.1, 3.3.3, 3.3.9
>            Reporter: Igor Fedorenko
>            Assignee: Igor Fedorenko
>             Fix For: 3.5.1
>
>
> This is a regression introduced by the fix for MNG-5742. When multiple 
> extensions=true plugins configured in the build, when mojos from one such 
> plugin are executed, components from other extensions are ignored.



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