<pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.rat</groupId>
          <artifactId>apache-rat-plugin</artifactId>
          <configuration>
            <excludes combine.children="append">
              <exclude>lifecycle-executor.txt</exclude>
              <exclude>plugin-manager.txt</exclude>
              <exclude>project-builder.txt</exclude>

                   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>

    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.rat</groupId>
          <artifactId>apache-rat-plugin</artifactId>
          <configuration>
            <excludes combine.children="append">
              <exclude>src/assembly/maven/bin/m2.conf</exclude>
              <!-- these are partial scripts, resulting in mvn scripts -->
              <exclude>src/assembly/shared/init</exclude>

        <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>

			</plugin>
			<plugin>
				<groupId>net.alchim31.maven</groupId>
				<artifactId>yuicompressor-maven-plugin</artifactId>
				<executions>
					<execution>
						<phase>compile</phase>
						<goals>
							<goal>compress</goal>
						</goals>
					</execution>
				</executions>
				<configuration>
					<nosuffix>true</nosuffix>