public String getProperty(String name, String defaultValue) {
        String value = properties.get(name);
        if (value != null) {
            return value;
        }
        else {
            return defaultValue;
        }
    }
Returns all property names as a Collection of String values.

@return all property names.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/spi/MUCServiceProperties.java