<id>check-compatibility</id>
						<goals>
							<goal>check</goal>
						</goals>
					</execution>
				</executions>
				<configuration>
					<failOnError>false</failOnError>
					<ignored>
						<difference>
							<!-- seems to be a clirr bug that it cannot handle the different inherited 
								return types -->
							<className>**</className>
							<differenceType>7006</differenceType>

    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
    for prod and one for tests. However, unlike our other packages, as of this

    <repository>
      <id>equal-repo-id</id>
      <url>https://maven.apache.org/null</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <releases>
        <checksumPolicy>ignore</checksumPolicy>
      </releases>
    </repository>
  </repositories>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>

          </association>
        </field>
        <field xdoc.separator="blank">
          <name>reports</name>
          <version>4.0.0</version>
          <description>
            @deprecated Now ignored by Maven.
          </description>
          <type>DOM</type>
        </field>
        <field>
          <name>reporting</name>
          <version>4.0.0+</version>
          <description>

            Let's take the warnings for one module, c.g.c.base.testModule, as an example:

              [INFO] Validating units:
              [INFO]    Ignored 53 units with compilation errors in first pass.
              [INFO] Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.

            <option name="REQUIRED_TAGS" value="" />
          </value>
        </option>
        <option name="IGNORE_DEPRECATED" value="false" />
        <option name="IGNORE_JAVADOC_PERIOD" value="true" />
        <option name="IGNORE_DUPLICATED_THROWS" value="false" />
        <option name="IGNORE_POINT_TO_ITSELF" value="false" />
        <option name="myAdditionalJavadocTags" value="" />
      </scope>

    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
    for prod and one for tests. However, unlike our other packages, as of this

              files=".*"/>

    <!-- Ignore code from maven subproject under org.apache -->
    <suppress checks="RegexpSingleline"
              files=".*[/\\]maven[/\\]src[/\\]main[/\\]java[/\\]org[/\\]apache[/\\].+"/>
    <suppress checks="RegexpHeader"
              files=".*[/\\]maven[/\\]src[/\\]main[/\\]java[/\\]org[/\\]apache[/\\].+"/>

          </excludePackageNames>
          <!-- Ignore some tags that are found in Java 11 sources but not recognized... under -source 8, I think it was? I can no longer reproduce the failure. -->
          <tags>
            <tag>
              <name>apiNote</name>

            </signature>
            <ignores>
              <!-- Unsafe isn't part of the documented Android API, but it is available.
                   And in cases where it's not, we have fallbacks (except maybe Striped64 (b/307807965)?). -->
              <ignore>sun.misc.Unsafe</ignore>
            </ignores>
          </configuration>
          <executions>
            <execution>