* message:
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsFrontHeader(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_front_header));
        return this;
    }

    /**
     * Add the created action message for the key 'errors.front_footer' with parameters.

    private FessLabels fessLabels;

    @Override
    public void setUp() throws Exception {
        super.setUp();
        fessLabels = new FessLabels();
    }

    /**
     * Test that assertPropertyNotNull throws exception for null input
     */
    public void test_assertPropertyNotNull_withNull() {
        try {
            // Create a test instance that extends FessLabels

    /**
     * Assert the property is not null.
     * @param property The value of the property. (NotNull)
     */
    protected void assertPropertyNotNull(String property) {
        if (property == null) {
            String msg = "The argument 'property' for message should not be null.";
            throw new IllegalArgumentException(msg);
        }
    }