* @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchEngineUsername();

    /**
     * Get the value for the key 'search_engine.username' as {@link Integer}. <br>
     * The value is, e.g.  <br>
     * comment: Username for authenticating to the search engine.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)

     * @return The value of found property. (NotNull: if not found, exception)
     * @throws ConfigPropertyNotFoundException When the property is not found.
     */
    String get(String propertyKey);

    /**
     * Is the property true?
     * @param propertyKey The key of the property which is boolean type. (NotNull)
     * @return The determination, true or false. (if not found, exception)

     * @param def the default value to return if the property is not found
     * @return the property value, or the default value if not found
     */

    public static String getProperty(final String key, final String def) {
        return prp.getProperty(key, def);
    }

    /**
     * Retrieve a <code>String</code>. If the property is not found, <code>null</code> is returned.
     *
     * @param key the property key to look up

    /**
     * Constructs a new FessUserNotFoundException with the specified username.
     *
     * @param username the username that was not found
     */
    public FessUserNotFoundException(final String username) {
        super("User is not found: " + username);
    }

 * at runtime. When a MIME type is not found in the mapping, a default value
 * is returned.
 */
public class FileTypeHelper {
    /** Logger instance for this class */
    private static final Logger logger = LogManager.getLogger(FileTypeHelper.class);

    /** Default file type value returned when MIME type is not found in mappings */
    protected String defaultValue = "others";

            int b = s.read();
            if (b < 31) {
                if (b < 0) {
                    throw new EOFException("EOF found inside tag value.");
                }
                throw new IOException("corrupted stream - high tag number < 31 found");
            }

            tagNo = b & 0x7f;

            // X.690-0207 8.1.2.4.2

            "The referenced account is currently locked out and may not be logged on to.", "Connection refused",
            "The remote system is not reachable by the transport.",
            "The layered file system driver for this I/O tag did not handle it when needed.",
            "No more files were found that match the file specification.", };

        // Arrange
        NetbiosAddress inputAddress = mock(NetbiosAddress.class);
        when(nameServiceClient.getNbtAllByAddress(inputAddress)).thenThrow(new UnknownHostException("Host not found"));

        // Act & Assert
        assertThrows(UnknownHostException.class, () -> nameServiceClient.getNbtAllByAddress(inputAddress));
        verify(nameServiceClient, times(1)).getNbtAllByAddress(inputAddress);
    }

     *
     * @param key the property key
     * @return the property value, or null if not found
     */
    public static String getProperty(String key) {
        return System.getProperty(key);
    }

    /**
     * Returns the system property value for the specified key, or the default value if not found.
     *
     * @param key the property key
     * @param defaultValue the default value

import org.lastaflute.web.Execute;
import org.lastaflute.web.response.HtmlResponse;

/**
 * Action class for handling HTTP 404 Not Found error pages.
 * This action displays error pages when the requested resource
 * cannot be found on the server.
 */
public class ErrorNotfoundAction extends FessSearchAction {

    /**
     * Default constructor for ErrorNotfoundAction.
     */