</goals>
            <configuration>
              <module>com.google.common.ForceGuavaCompilation</module>
              <failOnError>true</failOnError>
              <logLevel>${gwt.logLevel}</logLevel>
              <generateJsInteropExports>true</generateJsInteropExports>
              <validateOnly>true</validateOnly>
              <sourceLevel>1.8</sourceLevel>
              <!--