[
https://jira.codehaus.org/browse/MNG-5633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jason van Zyl closed MNG-5633.
------------------------------
Resolution: Duplicate
> 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
> Attachments: MNG-5633.patch
>
>
> 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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