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If the version associated with a managed dependency is removed there is no error or warning. If a child relies on the dependency then the child has a build error: "Project build error: 'dependencies.dependency.version' for org.apache.httpcomponents:httpclient:jar is missing." If the child overrides the dependency then we have a warning: Overriding managed version null for httpclient
not sure I understand the problem. can you give steps to reproduce? this could be related to https://issues.sonatype.org/browse/MNGECLIPSE-2636 in the sense that our project loading might swallow the warning emitted by maven (if there is any)
Sorry, I think I had a description of the setup in another bug. Create a project and a module, add a dependency into the module then manage a dependency in the project and remove the version element. At this point there should be a build error in the module but no problems marked in the project. Add a version to the dependency in the module, and a warning marker is added for overriding version null.
http://git.eclipse.org/c/m2e/m2e-core.git/commit/?id=f59b86b5b44a0d2ada42f5fc35edc5817a785782 fixes the part of editor warning marker appearing for version null. The missing marker for missing PM version is likely a consequence of us reading the maven model with no validation.. in that sense this part is duplicate of #350466
Moved to https://github.com/eclipse-m2e/m2e-core/issues/
