try { // Some code that may throw an exception } catch (Exception e) { // Handle the exception by sending an error response to the client response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "An error occurred: " + e.getMessage()); }
if (request.getParameter("name") == null) { // Send a 400 Bad Request response if the required parameter is missing response.sendError(HttpServletResponse.SC_BAD_REQUEST, "The 'name' parameter is required."); return; }This example demonstrates how to handle client errors by sending an appropriate HTTP response status code and message. In this case, a 400 Bad Request response is sent if a required parameter named "name" is missing from the client request. The javax.servlet.http package library is used for servlet programming in Java.