.xml

  <pluginManagement>
          <plugins>
              <!-- We specify the Maven compiler plugin as we need to set it to Java 1.8 -->
              <plugin>
                  <artifactId>maven-compiler-plugin</artifactId>
                  <version>3.1</version>
                  <configuration>
                      <source>1.8</source>
                      <target>1.8</target>
                  </configuration>
              </plugin>
          </plugins>
      </pluginManagement>

    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>gwt-maven-plugin</artifactId>
            <version>2.7.0</version>
            <dependencies>
                <dependency>
                    <groupId>com.google.gwt</groupId>
                    <artifactId>gwt-user</artifactId>
                    <version>${gwtVersion}</version>
                </dependency>
                <dependency>
                    <groupId>com.google.gwt</groupId>
                    <artifactId>gwt-dev</artifactId>
                    <version>${gwtVersion}</version>
                </dependency>
            </dependencies>

            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>test</goal>
                    </goals>
                </execution>
            </executions>
            <!-- Plugin configuration. There are many available options, see
              gwt-maven-plugin documentation at codehaus.org -->
            <configuration>
                <runTarget></runTarget>
                <failOnError>true</failOnError>
                <enableClosureCompiler>true</enableClosureCompiler>
                <compileReport>false</compileReport>
                <style>OBF</style>
                <!--<style>DETAILED</style>-->
                <launcherDir>${project.basedir}/src/main/webapp</launcherDir>
                <webappDirectory>${project.build.directory}/classes/web</webappDirectory>
            </configuration>
        </plugin>