* e.g running mvn site:run will cause Jetty to fail.
     * </p>
     * <p>
     * The resolution is to add -Djava.net.preferIPv4Stack=true to the command line as documented in
     * http://cwiki.apache.org/confluence/display/MAVEN/ConnectException
     * </p>
     */
    @Test
    void testJdk7ipv6() {
        ConnectException connEx = new ConnectException("Connection refused: connect");

    }

    public @Nullable Object getQualifier() {
        return qualifier;
    }

    /**
     * Returns an underlying type with display string formatting (package names stripped)
     * and prepended qualifier display string if this key has a qualifier.
     */
    public String getDisplayString() {
        return (qualifier != null ? Utils.getDisplayString(qualifier) + " " : "")

     */
    void visitStructure(FileCollectionStructureVisitor visitor);

    /**
     * Returns the display name of this file collection. Used in log and error messages.
     *
     * @return the display name
     */
    String getDisplayName();

    /**
     * Appends diagnostic information about the contents of this collection to the given formatter.
     */

        }
        return formatted.toString();
    }

    private void doDisplay(String message) throws IOException {
        try {
            MessageUtils.terminal.writer().print(message);
            MessageUtils.terminal.flush();
        } catch (Exception e) {
            throw new IOException("Unable to display message", e);
        }
    }

            PrintStream ps = new PrintStream(os);
            ps.println(
                    "A required class was missing while executing " + mojoDescriptor.getId() + ": " + e.getMessage());
            pluginRealm.display(ps);
            Exception wrapper = new PluginContainerException(mojoDescriptor, pluginRealm, os.toString(), e);
            throw new PluginExecutionException(mojoExecution, project, wrapper);
        } catch (LinkageError e) {

                        + pluginDescriptor.getId() + "'. A required class is missing: "
                        + cause.getMessage());
                pluginRealm.display(ps);

                throw new PluginContainerException(mojoDescriptor, pluginRealm, os.toString(), cause);
            } else if (cause instanceof LinkageError) {

            }
        }
        return result;
    }

    public String replaceUrl(final String url) { // for display or url converer
        if (cachedPathMappingList == null) {
            synchronized (this) {
                if (cachedPathMappingList == null) {
                    init();
                }
            }

    public CLIManager() {
        options = new Options();
        options.addOption(Option.builder(Character.toString(HELP))
                .longOpt("help")
                .desc("Display help information")
                .build());
        options.addOption(Option.builder(Character.toString(ALTERNATE_POM_FILE))
                .longOpt("file")
                .hasArg()

            }
        }

        if ((reference != null && !reference.isEmpty()) && !reference.startsWith("http:")) {
            reference = "http://cwiki.apache.org/confluence/display/MAVEN/" + reference;
        }

        return reference;
    }

    private boolean isNoteworthyException(Throwable exception) {
        if (exception == null) {
            return false;

        .suppressing(parentBuilder.getSuppressedTests())
        .createTestSuite();
  }

  /**
   * Returns an array of four bogus elements that will always be too high or too low for the
   * display. This includes two values for each extreme.
   *
   * <p>This method (dangerously) assume that the strings {@code "!! a"} and {@code "~~ z"} will