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From "Paul Benedict (JIRA)" <j...@codehaus.org>
Subject [jira] Created: (MNG-4472) [regression] Circular POM not detected
Date Sat, 28 Nov 2009 02:42:55 GMT
[regression] Circular POM not detected
--------------------------------------

                 Key: MNG-4472
                 URL: http://jira.codehaus.org/browse/MNG-4472
             Project: Maven 2
          Issue Type: Bug
          Components: Reactor and workspace
    Affects Versions: 3.0-alpha-4
            Reporter: Paul Benedict


If I were to specify a project with itself as a parent, Maven 2.2.1 gives this response:
{code}
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error building POM (may not be this project's POM).


Project ID: org.apache.maven.its.mng:test

Reason: Parent element is a duplicate of the current project  for project org.apache.maven.its.mng:test


[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.reactor.MavenExecutionException: Parent element is a duplicate of the current
project  for project org.apache.maven.its.mng:test
        at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:404)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:272)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.project.ProjectBuildingException: Parent element is a duplicate
of the current project  for project org.apache.maven.its.mng:test
{code}

Maven 3 doesn't detect this circularity; it tries to download the parent by going through
my remote repositories. The end result is still a failure since it can't find itself, but
it's a regression since the error condition is no longer detected.

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