}

            // Compute User IDs with Domain ID to get User SIDs
            // First extra is user if userId is empty
            if (!userId.isEmpty() && !userId.isBlank()) {
                this.userSid = new SID(domainId, userId);
            } else if (this.extraSids.length > 0) {
                this.userSid = this.extraSids[0];
            }

     * Note: If the first two characters are uppercase, the string will not be decapitalized.
     * <p>
     * Usage example:
     * </p>
     *
     * <pre>
     * StringUtil.decapitalize("UserId")  = "userId"
     * StringUtil.decapitalize("ABC")     = "ABC"
     * </pre>
     *
     * @param name
     *            the string to decapitalize
     * @return the decapitalized string
     */

        assertEquals("Abc", StringUtil.capitalize("abc"));
        assertEquals("Abc", StringUtil.capitalize("Abc"));
        assertEquals("ABC", StringUtil.capitalize("ABC"));
        assertEquals("UserId", StringUtil.capitalize("userId"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testDecapitalize() throws Exception {
        assertEquals("abc", StringUtil.decapitalize("abc"));

        String sessionId = MDC.get("sessionId");
        if (sessionId != null) {
            context.put("sessionId", sessionId);
        }
        String userId = MDC.get("userId");
        if (userId != null) {
            context.put("userId", userId);
        }
    }

    /**
     * Log an authentication event with optimized performance
     *
     * @param success whether authentication succeeded