I am trying to use the solution described here to solve the annoying "Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:build-helper-maven-plugin:1.7:add-source (execution: default, phase: generate-sources)" when I place the following plugin on my pom.xml: <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>build-helper-maven-plugin</artifactId> <executions> <execution> <phase>generate-sources</phase> <goals><goal>add-source</goal></goals> <configuration> <sources> <source>src/bootstrap/java</source> </sources> </configuration> </execution> </executions> </plugin> But when I run mvn clean install I get this: Reason: POM 'org.eclipse.m2e:lifecycle-mapping' not found in repository: Unable to download the artifact from any repository Does anyone have a clue on how to make m2e and maven happy?