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https://issues.apache.org/jira/browse/MNG-8121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17847036#comment-17847036
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ASF GitHub Bot commented on MNG-8121:
-------------------------------------
michael-o commented on PR #1508:
URL: https://github.com/apache/maven/pull/1508#issuecomment-2115783498
> This is what I proposed in
[bc03b17](https://github.com/apache/maven/commit/bc03b1762f6fab02985145e70bf6edd97102e2dc)
(even together with test cases and this was declined by @michael-o back then
in [#645
(comment)](https://github.com/apache/maven/pull/645#issuecomment-1001510028)).
Can we please add some test cases?
I must admit that I lost track completely...
> NullPointerException at
> org.apache.maven.artifact.repository.metadata.Metadata.merge
> (Metadata.java:293)
> --------------------------------------------------------------------------------------------------------
>
> Key: MNG-8121
> URL: https://issues.apache.org/jira/browse/MNG-8121
> Project: Maven
> Issue Type: Bug
> Components: Artifacts and Repositories
> Affects Versions: 3.9.6
> Environment: Maven 3.9.6
> maven-plugin-plugin 3.13.0
> org.sonatype.plugins:nexus-staging-maven-plugin:1.6.13
> Reporter: Gili
> Assignee: Tamas Cservenak
> Priority: Major
> Fix For: 3.9.7, 4.0.0, 4.0.0-beta-3
>
>
> TL;DR {{org.apache.maven.artifact.repository.metadata.Metadata.merge
> (Metadata.java:293)}} throws {{NullPointerException}} if previous releases of
> a plugin did not have a goalPrefix set.
>
> At least, this is my interpretation of what is going on.
>
> Background
> -------------
>
> I have an open-source project at
> [https://github.com/cmake-maven-project/cmake-maven-project/tree/v3.27.1-b1]
> with the following coordinates:
>
> <groupId>com.googlecode.cmake-maven-project</groupId>
> <artifactId>cmake</artifactId>
>
> If I upgrade "maven-plugin-plugin" from version 3.10.1 to 3.13.0 I am forced
> to set "<goalPrefix>" because of
> https://issues.apache.org/jira/browse/MPLUGIN-450 and
> [https://github.com/apache/maven-plugin-tools/commit/ed4774bcd8b8d2d1f7ff1196cf7644054cb3ae14#diff-624cbd32cd7fc0f3f9154fbec92b8a1aebb04614360b4a0b5fc28a407e99d743L96]
>
> In my particular case, I set "<goalPrefix>cmake-binaries</goalPrefix>" inside
> cmake-binaries-plugin/pom.xml.
> Now, when I try deploying a release to Maven Central I get the following
> exception stack trace:
>
>
> {noformat}
> java.lang.NullPointerException
> at org.apache.maven.artifact.repository.metadata.Metadata.merge
> (Metadata.java:293)
> at
> org.apache.maven.artifact.repository.metadata.AbstractRepositoryMetadata.updateRepositoryMetadata
> (AbstractRepositoryMetadata.java:99)
> at
> org.apache.maven.artifact.repository.metadata.AbstractRepositoryMetadata.storeInLocalRepository
> (AbstractRepositoryMetadata.java:59)
> at org.apache.maven.artifact.repository.metadata.MetadataBridge.merge
> (MetadataBridge.java:56)
> at org.eclipse.aether.internal.impl.DefaultDeployer.upload
> (DefaultDeployer.java:399)
> at org.eclipse.aether.internal.impl.DefaultDeployer.deploy
> (DefaultDeployer.java:294)
> at org.eclipse.aether.internal.impl.DefaultDeployer.deploy
> (DefaultDeployer.java:202)
> at org.eclipse.aether.internal.impl.DefaultRepositorySystem.deploy
> (DefaultRepositorySystem.java:393)
> at org.apache.maven.artifact.deployer.DefaultArtifactDeployer.deploy
> (DefaultArtifactDeployer.java:131)
> at
> org.sonatype.nexus.maven.staging.deploy.strategy.AbstractDeployStrategy.deployUp
> (AbstractDeployStrategy.java:213)
> at
> org.sonatype.nexus.maven.staging.deploy.strategy.StagingDeployStrategy.finalizeDeploy
> (StagingDeployStrategy.java:125)
> at org.sonatype.nexus.maven.staging.deploy.DeployMojo.execute
> (DeployMojo.java:213)
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:126){noformat}
>
> I assume that this is caused by {{preExisting.getPrefix()}} returning null,
> but I have no idea why this is happening. Perhaps this is caused by previous
> versions not have a goalPrefix set? Shouldn't the implementation handle this
> possibility?
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