[NPANDAY-411] Transitive dependency resolution requires explicit version in a dependent child pom

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4-incubating
• Fix Version/s: 1.5.0-incubating
• Component/s: Maven Plugins

Environment

$ mvn -v
Apache Maven 2.2.1 (rdebian-4)
Java version: 1.6.0_24
Java home: /usr/lib/jvm/java-6-sun-1.6.0.24/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux" version: "2.6.35-28-generic" arch: "amd64" Family: "unix"

• Assignee: Lars Corneliussen
• Reporter: John Robert Fallows
• Created: 19/Apr/11 22:08
• Updated: 17/May/13 12:29
• Resolved: 09/May/12 08:00

Description

In the past, NPanday required the version of a dependency in pom.xml to be explicit, whereas now that has been fixed so that a parent pom.xml can specify the version in the dependencyManagement section instead.

Suppose we have 3 projects called Parent, Library and Executable. The Parent pom refers to both Library and Executable projects as modules, and also acts as the super pom for both Library and Executable projects. The Executable project depends on the Library project. The Parent project defaults the version of another dotnet-library (let's say ThirdParty) used by the Library project in the Parent's dependencyManagement section.

The Library project builds successfully. However, when attempting to build the Executable project, it complains during dependency resolution that the version is missing from ThirdParty and the build fails. Now, while the version is physically missing from the Library pom.xml file, it is not missing from the effective pom for the Library and should therefore not give any error, just as no error is given when the Library project builds.

WARNING: NPANDAY-180-003: Project Version is missing: Group Id = NUnit, Artifact Id = NUnit.Framework
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException
	at npanday.dao.Project.hashCode(Project.java:329)
	at java.util.HashMap.put(HashMap.java:372)
	at java.util.HashSet.add(HashSet.java:200)
	at npanday.dao.Project.addProjectDependency(Project.java:204)
	at npanday.dao.ProjectFactory.createProjectFrom(ProjectFactory.java:147)
	at npanday.dao.impl.ProjectDaoImpl.storeProjectAndResolveDependencies(ProjectDaoImpl.java:866)
	at npanday.dao.impl.ProjectDaoImpl.storeProjectAndResolveDependencies(ProjectDaoImpl.java:414)
	at npanday.artifact.impl.AssemblyResolverImpl.resolveTransitivelyFor(AssemblyResolverImpl.java:131)
	at npanday.plugin.compile.ComponentInitializerMojo.execute(ComponentInitializerMojo.java:86)
	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
	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)