[ 
https://issues.apache.org/jira/browse/MPLUGIN-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17471125#comment-17471125
 ] 

Konrad Windszus edited comment on MPLUGIN-384 at 1/8/22, 12:56 PM:
-------------------------------------------------------------------

It is related to 
https://github.com/apache/maven-plugin-tools/commit/73e32d10e5ef6d42d3438fb34f6bb5561bce952c.
 The GroupRepositoryMetadata class has been moved to a different package and is 
therefore no longer picked up by 
https://github.com/sonatype/nexus-maven-plugins/blob/004ce69645be992d2f11fcb4d3a3ba49e5c7baf5/staging/maven-plugin/src/main/java/org/sonatype/nexus/maven/staging/deploy/strategy/AbstractDeployStrategy.java#L110.
 This requires a fix in m-staging-p imho.


was (Author: kwin):
It may be related to 
https://github.com/apache/maven-plugin-tools/commit/73e32d10e5ef6d42d3438fb34f6bb5561bce952c.
 it seems that group repository metadata is no longer generated (and therefore 
no longer picked up by m-staging-p)

> Cannot invoke "String.equals(Object)" because the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MPLUGIN-384
>                 URL: https://issues.apache.org/jira/browse/MPLUGIN-384
>             Project: Maven Plugin Tools
>          Issue Type: Bug
>          Components: Plugin Plugin
>    Affects Versions: 3.6.2
>         Environment: Windows 10 64-bit, Java 8 and 17, maven 3.8.1
>            Reporter: Bob Marinier
>            Priority: Major
>
> Version 3.6.1 of maven-plugin-plugin worked fine, but since updating to 
> version 3.6.2, I get an NPE (tested with Java 8 and Java 17). I believe the 
> error in both Java 8 and Java 17 is the same, but Java 17 gives a better 
> message (see below). Even though it's the nexus-staging-maven-plugin that is 
> complaining, the message implies that the maven-plugin-plugin is somehow 
> failing to extract the prefix from the plugin. Going back to 
> maven-plugin-plugin version 3.6.1 fixes the issue.
> {{[ERROR] Failed to execute goal 
> org.sonatype.plugins:nexus-staging-maven-plugin:1.6.8:deploy 
> (injected-nexus-deploy) on project my-maven-plugin: Failed to update metadata 
> my.group.id/maven-metadata.xml: Cannot invoke "String.equals(Object)" because 
> the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null -> 
> [Help 1]}}
> {{org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute 
> goal org.sonatype.plugins:nexus-staging-maven-plugin:1.6.8:deploy 
> (injected-nexus-deploy) on project my-maven-plugin: Failed to update metadata 
> my.group.id/maven-metadata.xml: Cannot invoke "String.equals(Object)" because 
> the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:215)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)}}
> {{    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:56)}}
> {{    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)}}
> {{    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)}}
> {{    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)}}
> {{    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)}}
> {{    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native 
> Method)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:77)}}
> {{    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)}}
> {{    at java.lang.reflect.Method.invoke (Method.java:568)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
> (Launcher.java:347)}}
> {{Caused by: org.apache.maven.plugin.MojoExecutionException: Failed to update 
> metadata my.group.id/maven-metadata.xml: Cannot invoke 
> "String.equals(Object)" because the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null}}
> {{    at org.sonatype.nexus.maven.staging.deploy.DeployMojo.execute 
> (DeployMojo.java:216)}}
> {{    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
> (DefaultBuildPluginManager.java:137)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:210)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)}}
> {{    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:56)}}
> {{    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)}}
> {{    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)}}
> {{    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)}}
> {{    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)}}
> {{    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native 
> Method)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:77)}}
> {{    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)}}
> {{    at java.lang.reflect.Method.invoke (Method.java:568)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
> (Launcher.java:347)}}
> {{Caused by: org.apache.maven.artifact.deployer.ArtifactDeploymentException: 
> Failed to update metadata my.group.id/maven-metadata.xml: Cannot invoke 
> "String.equals(Object)" because the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null}}
> {{    at org.apache.maven.artifact.deployer.DefaultArtifactDeployer.deploy 
> (DefaultArtifactDeployer.java:146)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.AbstractDeployStrategy.deployUp
>  (AbstractDeployStrategy.java:213)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.DeferredDeployStrategy.finalizeDeploy
>  (DeferredDeployStrategy.java:86)}}
> {{    at org.sonatype.nexus.maven.staging.deploy.DeployMojo.execute 
> (DeployMojo.java:213)}}
> {{    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
> (DefaultBuildPluginManager.java:137)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:210)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)}}
> {{    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:56)}}
> {{    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)}}
> {{    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)}}
> {{    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)}}
> {{    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)}}
> {{    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native 
> Method)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:77)}}
> {{    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)}}
> {{    at java.lang.reflect.Method.invoke (Method.java:568)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
> (Launcher.java:347)}}
> {{Caused by: org.eclipse.aether.deployment.DeploymentException: Failed to 
> update metadata my.group.id/maven-metadata.xml: Cannot invoke 
> "String.equals(Object)" because the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.upload 
> (DefaultDeployer.java:437)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.deploy 
> (DefaultDeployer.java:321)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.deploy 
> (DefaultDeployer.java:213)}}
> {{    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.deploy 
> (DefaultRepositorySystem.java:386)}}
> {{    at org.apache.maven.artifact.deployer.DefaultArtifactDeployer.deploy 
> (DefaultArtifactDeployer.java:142)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.AbstractDeployStrategy.deployUp
>  (AbstractDeployStrategy.java:213)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.DeferredDeployStrategy.finalizeDeploy
>  (DeferredDeployStrategy.java:86)}}
> {{    at org.sonatype.nexus.maven.staging.deploy.DeployMojo.execute 
> (DeployMojo.java:213)}}
> {{    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
> (DefaultBuildPluginManager.java:137)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:210)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)}}
> {{    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:56)}}
> {{    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)}}
> {{    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)}}
> {{    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)}}
> {{    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)}}
> {{    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native 
> Method)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:77)}}
> {{    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)}}
> {{    at java.lang.reflect.Method.invoke (Method.java:568)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
> (Launcher.java:347)}}
> {{Caused by: org.eclipse.aether.RepositoryException: Cannot invoke 
> "String.equals(Object)" because the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null}}
> {{    at org.apache.maven.artifact.repository.metadata.MetadataBridge.merge 
> (MetadataBridge.java:70)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.upload 
> (DefaultDeployer.java:433)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.deploy 
> (DefaultDeployer.java:321)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.deploy 
> (DefaultDeployer.java:213)}}
> {{    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.deploy 
> (DefaultRepositorySystem.java:386)}}
> {{    at org.apache.maven.artifact.deployer.DefaultArtifactDeployer.deploy 
> (DefaultArtifactDeployer.java:142)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.AbstractDeployStrategy.deployUp
>  (AbstractDeployStrategy.java:213)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.DeferredDeployStrategy.finalizeDeploy
>  (DeferredDeployStrategy.java:86)}}
> {{    at org.sonatype.nexus.maven.staging.deploy.DeployMojo.execute 
> (DeployMojo.java:213)}}
> {{    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
> (DefaultBuildPluginManager.java:137)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:210)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)}}
> {{    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:56)}}
> {{    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)}}
> {{    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)}}
> {{    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)}}
> {{    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)}}
> {{    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native 
> Method)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:77)}}
> {{    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)}}
> {{    at java.lang.reflect.Method.invoke (Method.java:568)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
> (Launcher.java:347)}}
> {{Caused by: java.lang.NullPointerException: Cannot invoke 
> "String.equals(Object)" because the return value of 
> "org.apache.maven.artifact.repository.metadata.Plugin.getPrefix()" is null}}
> {{    at org.apache.maven.artifact.repository.metadata.Metadata.merge 
> (Metadata.java:276)}}
> {{    at 
> org.apache.maven.artifact.repository.metadata.AbstractRepositoryMetadata.updateRepositoryMetadata
>  (AbstractRepositoryMetadata.java:121)}}
> {{    at 
> org.apache.maven.artifact.repository.metadata.AbstractRepositoryMetadata.storeInLocalRepository
>  (AbstractRepositoryMetadata.java:67)}}
> {{    at org.apache.maven.artifact.repository.metadata.MetadataBridge.merge 
> (MetadataBridge.java:65)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.upload 
> (DefaultDeployer.java:433)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.deploy 
> (DefaultDeployer.java:321)}}
> {{    at org.eclipse.aether.internal.impl.DefaultDeployer.deploy 
> (DefaultDeployer.java:213)}}
> {{    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.deploy 
> (DefaultRepositorySystem.java:386)}}
> {{    at org.apache.maven.artifact.deployer.DefaultArtifactDeployer.deploy 
> (DefaultArtifactDeployer.java:142)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.AbstractDeployStrategy.deployUp
>  (AbstractDeployStrategy.java:213)}}
> {{    at 
> org.sonatype.nexus.maven.staging.deploy.strategy.DeferredDeployStrategy.finalizeDeploy
>  (DeferredDeployStrategy.java:86)}}
> {{    at org.sonatype.nexus.maven.staging.deploy.DeployMojo.execute 
> (DeployMojo.java:213)}}
> {{    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
> (DefaultBuildPluginManager.java:137)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:210)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)}}
> {{    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)}}
> {{    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:56)}}
> {{    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)}}
> {{    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)}}
> {{    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)}}
> {{    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)}}
> {{    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)}}
> {{    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native 
> Method)}}
> {{    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:77)}}
> {{    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)}}
> {{    at java.lang.reflect.Method.invoke (Method.java:568)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)}}
> {{    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
> (Launcher.java:347)}}



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