} else {
                String optionalSelectors = unresolvedSelectors.stream()
                        .map(ProjectActivation.ProjectActivationSettings::selector)
                        .collect(Collectors.joining(", "));
                LOGGER.info("The requested optional projects {} do not exist.", optionalSelectors);
            }
        }

                if (initial != null) {
                    final DfsReferralDataInternal start = initial.unwrap(DfsReferralDataInternal.class);
                    DfsReferralDataInternal dr = start;
                    do {
                        final String domain = dr.getServer().toLowerCase();
                        entry.map.put(domain, new HashMap<>());
                        if (log.isTraceEnabled()) {

// do not require flushing because they are not necessary for a subsequent data
// read to be handled correctly. On the other hand, a change to the file size
// (st_size, as made by say ftruncate(2)), would require a metadata flush.
//
// The aim of fdatasync() is to reduce disk activity for applications that
// do not require all metadata to be synchronized with the disk.

    /**
     * Default ctor for Plexus compatibility, as many plugins have artifact handlers declared in legacy Plexus XML.
     * Do not use directly!
     *
     * @deprecated This ctor is present only for Plexus XML defined component compatibility, do not use it.
     */
    @Deprecated
    public DefaultArtifactHandler() {
        this.type = null;
    }

import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.Function;

/**
 * A {@link RestTestTransform} that injects HTTP headers into a REST test. This includes adding the necessary values to the "do" section
 * as well as adding headers as a features to the "setup" and "teardown" sections.
 */
public class InjectHeaders extends FeatureInjector implements RestTestTransformByParentObject {

You can declare that a parameter can accept `None`, but that it's still required. This would force clients to send a value, even if the value is `None`.

To do that, you can declare that `None` is a valid type but simply do not declare a default value:

{* ../../docs_src/query_params_str_validations/tutorial006c_an_py310.py hl[9] *}

## Query parameter list / multiple values { #query-parameter-list-multiple-values }

    }

    /**
     * A transformation to replace the key in a do section.
     *
     * @param oldKeyName the key name directly under do to replace.
     * @param newKeyName the new key name directly under do.
     * @param testName   the testName to apply replacement
     * @see ReplaceKeyInDo
     */

ret=$?
if [ $ret -ne 0 ]; then
	echo "BUG: expected no 'diff' after replication: $out"
	exit 1
fi

sitea_count=$(cat /tmp/sitea_dirs.txt | wc -l) # need to do it this way to avoid filename in the output
siteb_count=$(cat /tmp/siteb_dirs.txt | wc -l) # need to do it this way to avoid filename in the output
sitea_out=$(cat /tmp/sitea_dirs.txt)
siteb_out=$(cat /tmp/siteb_dirs.txt)

if [ $sitea_count -ne 0 ]; then

      Exception.
      -->
    <module name="RegexpSinglelineJava">
      <property name="format" value="serialVersionUID" />
      <property name="message" value="Do not declare serialVersionUID." />
      <property name="ignoreComments" value="true" />
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="java\.io\.Serializable;" />

    // load timeout multiplier.  Or we could try to use a CPU time bound instead of wall clock time
    // bound.  But these ideas are harder to implement.  We do not try to detect or handle a
    // user-specified -XX:+DisableExplicitGC.
    //
    // TODO(user): Consider using
    // java/lang/management/OperatingSystemMXBean.html#getSystemLoadAverage()
    //