[ 
https://issues.apache.org/jira/browse/MPLUGIN-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17471591#comment-17471591
 ] 

Michael Osipov commented on MPLUGIN-384:
----------------------------------------

Pretty much sounds like a can of worms...

> Nexus Staging Plugin - incompatibility
> --------------------------------------
>
>                 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
>            Assignee: Herve Boutemy
>            Priority: Major
>             Fix For: 3.6.4
>
>
> 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.
> {noformat}
> [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)
> {noformat}



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