Output Standards - Java

When sending data from the backend to the frontend, always use the standard methods provided by WebUtils. Writing custom-formatted strings directly to PrintWriter is not allowed.

Success Response

WebUtils.flushSuccessMessage(
    HttpServletRequest req,
    HttpServletResponse res,
    PrintWriter writer,
    JSONObject data
) throws Exception

Use this to send a standard success JSON response to the frontend.

Failure Response

WebUtils.flushFailureMessageAutoClose(
    HttpServletRequest req,
    HttpServletResponse res,
    int errorCode,
    String description
) throws Exception

Use this to send a standard failure JSON response containing an error code and description to the frontend.

Notes

• All scenarios that need to send data to the client must use one of the methods above.
• Any user-visible text in description must be internationalized using Inter.getLocText().
• Error codes must use predefined constants from the project — magic numbers are not allowed.