gistfile1.txt

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-enforcer-plugin</artifactId>
                <executions>

                    <!-- JDK7 and Maven 3.0.3+ are expected -->
                    <execution>
                        <id>enforce-environment-versions</id>
                        <goals>
                            <goal>enforce</goal>
                        </goals>
                        <configuration>
                            <rules>
                                <requireMavenVersion>
                                    <version>3.0.3</version>
                                </requireMavenVersion>
                                <requireJavaVersion>
                                    <version>1.7.0</version>
                                </requireJavaVersion>
                            </rules>
                        </configuration>
                    </execution>

                    <!-- Enforce Proper Declaration of Dependencies -->
                    <execution>
                        <id>enforce-dependencies</id>
                        <goals>
                            <goal>enforce</goal>
                        </goals>
                        <configuration>
                            <rules>
                                <!-- Require explicit declaration of the highest version of dependency that is a
                                     transitive dependency of two other direct dependencies -->
                                <dependencyConvergence/>
                                <requireUpperBoundsDeps/>

                                <!-- All plugins must have a version declared -->
                                <requirePluginVersions/>
                            </rules>
                        </configuration>
                    </execution>
                </executions>
            </plugin>