Q:

Usage of maven Build Helper Maven Plugin

I'm attempting to add a source folder for maven java project to Eclipse using a maven plugin.
When trying to use the org.codehaus.mojo plugin I receive the following error
Failed to execute goal org.codehaus.mojo:build-helper-maven-plugin:1.7:add-source (default-cli) on project application-framework: The parameters 'sources' for goal org.codehaus.mojo:build-helper-maven-plugin:1.7:add-source are missing or invalid -> [Help 1]
From reading the docs on http://mojo.codehaus.org/build-helper-maven-plugin/usage.html this should be correct ?
The folder target/sources/mygeneratedfiles on exists. 
<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>build-helper-maven-plugin</artifactId>
    <executions>
        <execution>
         <id>add-source</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>add-source</goal>
            </goals>
            <configuration>
                <sources>
                    <source>target/sources/mygeneratedfiles</source>
                </sources>
            </configuration>
        </execution>
    </executions>
</plugin>

A:

The problem is that the build helper plugin is in general too old to be used with the newest maven versions (in combination with the m2e eclipse plugin), because of the "relative new" Lifecycle-mapping rules.
I solved this issue by adding a lifecyclemapping configuration for the build-helper-maven-plugin for the orgeclipse.m2e plugib. see below:
        <plugin>
            <groupId>org.eclipse.m2e</groupId>
            <artifactId>lifecycle-mapping</artifactId>
            <version>1.0.0</version>
            <configuration>
                <lifecycleMappingMetadata>
                    <pluginExecutions>
                        <pluginExecution>
                            <pluginExecutionFilter>
                                <groupId>org.codehaus.mojo</groupId>
                                <artifactId>build-helper-maven-plugin</artifactId>
                                <versionRange>[1.0,)</versionRange>
                                <goals>
                                    <goal>add-source</goal>
                                    <goal>add-test-source</goal>
                                    <goal>add-resource</goal>
                                    <goal>add-test-resource</goal>
                                    <goal>maven-version</goal>
                                    <goal>parse-version</goal>
                                </goals>
                            </pluginExecutionFilter>
                            <action>
                                <execute>
                                    <runOnConfiguration>true</runOnConfiguration>
                                    <runOnIncremental>true</runOnIncremental>
                                </execute>
                            </action>
                        </pluginExecution>
                    </pluginExecutions>
                </lifecycleMappingMetadata>
            </configuration>
        </plugin>

