Gabriel Reid created MNG-5633:
---------------------------------
Summary: NullPointerException when project contains cyclic
references
Key: MNG-5633
URL: https://jira.codehaus.org/browse/MNG-5633
Project: Maven 2 & 3
Issue Type: Bug
Reporter: Gabriel Reid
Using maven 3.2.1, when a project has a cyclic dependency between modules, a
NullPointerException is thrown.
The situation is that there is a root pom that references two modules, a and b.
Module a is dependent on b, and module b is dependent on a.
The relevant portions of the poms are as follows:
root pom
{code}
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>invalid</artifactId>
<version>0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>a</module>
<module>b</module>
</modules>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>test</groupId>
<artifactId>a</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>test</groupId>
<artifactId>b</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
{code}
a/pom.xml
{code}
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>a</artifactId>
<parent>
<groupId>test</groupId>
<artifactId>invalid</artifactId>
<version>0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>test</groupId>
<artifactId>b</artifactId>
</dependency>
</dependencies>
</project>
{code}
a/pom.xml
{code}
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>b</artifactId>
<parent>
<groupId>test</groupId>
<artifactId>invalid</artifactId>
<version>0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>test</groupId>
<artifactId>a</artifactId>
</dependency>
</dependencies>
</project>
{code}
Running a simple maven command such as "mvn clean" results in the following:
{code}
$ mvn clean
[INFO] Scanning for projects...
[ERROR] Internal error: java.lang.NullPointerException -> [Help 1]
org.apache.maven.InternalErrorException: Internal error:
java.lang.NullPointerException
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:167)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.lang.NullPointerException
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:270)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
... 11 more
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please
read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/InternalErrorException
{code}
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