JDK6-like APIs.

                   So instead, we use javac9, which doesn't lead to this error.
              -->
              <compilerArgs combine.children="append">
                <arg>-J-Xbootclasspath/p:${settings.localRepository}/com/google/errorprone/javac/${javac.version}/javac-${javac.version}.jar</arg>
              </compilerArgs>
            </configuration>

        <artifactId>gwt-maven-plugin</artifactId>
        <version>${gwt.plugin.version}</version>
        <executions>
          <execution>
            <id>gwt-compile</id>
            <goals>
              <goal>compile</goal>
            </goals>
            <configuration>
              <module>com.google.common.ForceGuavaCompilation</module>
              <failOnError>true</failOnError>