public static String getProperty(String subdomain, String name, String defaultValue) {
        final String value = getProperty(subdomain, name);
        if (value != null) {
            return value;
        } else {
            return defaultValue;
        }
    }
Returns a Jive property. If the specified property doesn't exist, the
{@code defaultValue} will be returned.

@param subdomain the subdomain of the service to retrieve a property from
@param name the name of the property to return.
@param defaultValue value returned if the property doesn't exist.
@return the property value specified by name.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/spi/MUCPersistenceManager.java