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The version of cobertura-maven-plugin is not specified in pom.xml and Maven shows warning messages about it as follows: Some problems were encountered while building the effective model for org.hudsonci.plugins:mercurial:hpi:1.45-h-2-SNAPSHOT 'build.plugins.plugin.version' for org.codehaus.mojo:cobertura-maven-plugin is missing. @ line 122, column 18 It is highly recommended to fix these problems because they threaten the stability of your build. For this reason, future Maven versions might no longer support building such malformed projects.
That's fairly common in plugins. Specify a version if you want.