[ http://jira.codehaus.org/browse/MNG-590?page=all ]
Brett Porter closed MNG-590:
----------------------------
Resolution: Fixed
avoiding NPE.
The problem is that the POM ignores all attributes, so it is effectively
<dependency />, which has no group, artifact or version.
> NPE in org.apache.maven.artifact.DefaultArtifact.hashCode
> ---------------------------------------------------------
>
> Key: MNG-590
> URL: http://jira.codehaus.org/browse/MNG-590
> Project: Maven 2
> Type: Bug
> Versions: 2.0-alpha-3
> Reporter: Steve Loughran
> Priority: Critical
> Fix For: 2.0-beta-1
> Attachments: pom.xml
>
>
> Getting an NPE when attempting to write a POM/. Now, an NPE in a hashCode
> usually means a gulf between the classes expectatoins and what fields are
> configured. I dont see anything obvious missing from my pom, though of course
> I am just learning maven. Either the hashcode operator needs fixing to handle
> missing data, or something upstream should fail with a meaningful error.
> java.lang.NullPointerException
> at
> org.apache.maven.artifact.DefaultArtifact.hashCode(DefaultArtifact.java:193)
> at java.util.HashMap.hash(HashMap.java:264)
> at java.util.HashMap.put(HashMap.java:382)
> at java.util.HashSet.add(HashSet.java:194)
> at
> org.apache.maven.artifact.factory.DefaultArtifactFactory.createArtifacts(DefaultArtifactFactory.java:44)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.processProjectLogic(DefaultMavenProjectBuilder.java:266)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjectBuilder.java:198)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFile(DefaultMavenProjectBuilder.java:129)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjectBuilder.java:117)
> at org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:266)
> at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:170)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:102)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:233)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)constituent
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:585)
> at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:303)
> at org.codehaus.classworlds.Launcher.launch(Launcher.java:243)
> at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:416)
> at org.codehaus.classworlds.Launcher.main(Launcher.java:363)
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