worked everywhere that I know of except for one place: when running the GWT
    util.concurrent tests under Guava.

    The problem is that GWT responds poorly to two .gwt.xml files in the same
    Java package; see https://goo.gl/pRV3Yn for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one

    worked everywhere that I know of except for one place: when running the GWT
    util.concurrent tests under Guava.

    The problem is that GWT responds poorly to two .gwt.xml files in the same
    Java package; see https://goo.gl/pRV3Yn for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one

          <code><![CDATA[
    public void updateTimestamp()
    {
        setLastUpdatedTimestamp( new java.util.Date() );
    }

    public void setLastUpdatedTimestamp( java.util.Date date )
    {
        java.util.TimeZone timezone = java.util.TimeZone.getTimeZone( "UTC" );
        java.text.DateFormat fmt = new java.text.SimpleDateFormat( "yyyyMMddHHmmss" );
        fmt.setTimeZone( timezone );

        return match;
    }

    private java.util.Map<String, Profile> profileMap;

    /**
     * Reset the {@code profileMap} field to {@code null}
     */
    public void flushProfileMap() {
        this.profileMap = null;
    }

    /**
     * @return a Map of profiles field keyed by {@link Profile#getId()}
     */
    public java.util.Map<String, Profile> getProfilesAsMap() {

          <instructions>
            <Export-Package>
              !com.google.common.base.internal,
              !com.google.common.util.concurrent.internal,
              com.google.common.*
            </Export-Package>
            <Import-Package>
              com.google.common.util.concurrent.internal,
              javax.annotation;resolution:=optional,
              javax.crypto.*;resolution:=optional,

            the add-opens. Right now that doesn't seem worth the effort, though.
        -->
        <test.add.opens>
          --add-opens java.base/java.lang=ALL-UNNAMED
          --add-opens java.base/java.util=ALL-UNNAMED
          --add-opens java.base/sun.security.jca=ALL-UNNAMED
        </test.add.opens>
      </properties>
    </profile>
    <profile>
      <id>javac9-for-jdk8</id>
      <activation>

      <groupId>org.apache.maven.resolver</groupId>
      <artifactId>maven-resolver-spi</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven.resolver</groupId>
      <artifactId>maven-resolver-util</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-xml-impl</artifactId>
    </dependency>
    <dependency>
      <groupId>org.codehaus.plexus</groupId>