Configuring Error Page In Spring
exception handling but, when teaching Spring MVC, I often find that my students are confused or not
Spring Java Config Error Page
comfortable with them. Today I’m going to show you the whitelabel error page spring various options available. Our goal is to not handle exceptions explicitly in Controller methods where whitelabel error page spring boot possible. They are a cross-cutting concern better handled separately in dedicated code. There are three options: per exception, per controller or globally. A demonstration
Custom Error Page Spring
application that shows the points discussed here can be found athttp://github.com/paulc4/mvc-exceptions. See Sample Application below for details. NOTE: The demo applications has been revamped and updated (October 2014) to use Spring Boot 1.1.8 and is (hopefully) easier to use and understand.Using HTTP Status Codes Normally any unhandled exception thrown when
Custom Error Page Spring Mvc
processing a web-request causes the server to return an HTTP 500 response. However, any exception that you write yourself can be annotated with the @ResponseStatus annotation (which supports all the HTTP status codes defined by the HTTP specification). When an annotated exception is thrown from a controller method, and not handled elsewhere, it will automatically cause the appropriate HTTP response to be returned with the specified status-code. For example, here is an exception for a missing order. @ResponseStatus(value=HttpStatus.NOT_FOUND, reason="No such Order") // 404 public class OrderNotFoundException extends RuntimeException { // ... } And here is a controller method using it: @RequestMapping(value="/orders/{id}", method=GET) public String showOrder(@PathVariable("id") long id, Model model) { Order order = orderRepository.findOrderById(id); if (order == null) throw new OrderNotFoundException(id); model.addAttribute(order); return "orderDetail"; } A familiar HTTP 404 response will be returned if the URL handled by this method includes an unknown order id.Controller Based Exception
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Exception Handling In Spring Mvc 4
pv/wIn J2EE / servlet web application, you can map error page to specify exception spring boot custom error page like this :web.xml 404 /WEB-INF/pages/404.jsp com.mkyong.web.exception.CustomException /WEB-INF/pages/error/custom_error.jsp java.lang.Exception /WEB-INF/pages/generic_error.jsp The above code should be self-exploratory. If https://spring.io/blog/2013/11/01/exception-handling-in-spring-mvc the exception handling function exists in the servlet container, why we still need to use the Spring to handle the exception?Generally, there are two reasons :Customize Error Page - The servlet container will render the error page directly; While the Spring allows you to populate https://www.mkyong.com/spring-mvc/spring-mvc-exception-handling-example/ model or data to the error page, so that you can customize a more user friendly error page.Business logic - Spring allow you to apply extra business logic before rendering the error page, like logging, auditing and etc.In this tutorial, we will show you two examples to handle the exception in Spring.For Spring 2.x, we use SimpleMappingExceptionResolver in the XML file.For Spring 3.x, we can simplify the XML configuration via @ExceptionHandler annotation.1. SimpleMappingExceptionResolver ExampleReview the directory structure. A custom exception.CustomGenericException.java package com.mkyong.web.exception; public class CustomGenericException extends RuntimeException { private static final long serialVersionUID = 1L; private String errCode; private String errMsg; //getter and setter methods public CustomGenericException(String errCode, String errMsg) { this.errCode = errCode; this.errMsg = errMsg; } } This controller class, just throw a CustomGenericException with custom error code and error
Logical Reasoning Data Interpretation Verbal Ability Reading Comprehension Custom 404 Error Page in Spring MVC Points To http://www.ekiras.com/2015/02/custom-error-404-error-page-in-spring-mvc.html Remember You need to first add the errors in the web.xmland redirect them to a url. Then you need to map these url to http://blog.codeleak.pl/2013/04/how-to-custom-error-pages-in-tomcat.html controller to handle them and take necessary actions. You can either handle exceptions in your controllers as explained in the link. Custom Error Pages error page Here in this example we are going to create custom error pages in our spring mvc application. So will first of all configure the error codes in web.xml like the following. web.xml 400 /400 404 /404 500 /500.jsp Now when we have configured error page spring the error codes and mapped then with the respective url's, we will now create a Controller that will map these error code url's like the following. HTTPErrorHandler.java package com.ekiras.util; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class HTTPErrorHandler{ String path = "/error"; @RequestMapping(value="/400") public String error400(){ System.out.println("custom error handler"); return path+"/400"; } @RequestMapping(value="/404") public String error404(){ System.out.println("custom error handler"); return path+"/404"; } @RequestMapping(value="/500") public String error500(){ System.out.println("custom error handler"); return path+"/500"; } } So now our Controller will handle the error code url's and will redirect them to the custom error page url's. Labels: Exception Handling , Exceptions , Spring , Spring MVC No comments : Post a Comment Follow by Email Ekansh Rastogi Love coding and exploring new technologies Top Technologies in Blog Spring Boot Object Oriented Javascript Java Reflection Api 2015 © EkiRas.com. ALL Rights Reserved. Privacy Policy | Terms of Service
including server version and exception stack trace. Servlet specification provides a way to configure an exceptional behavior through web.xml. One can configure either reaction on a specific Java exception or to a selected Http response code(s). error-page element specifies a mapping between an error code or exception type to the path of a resource in the Web application: java.lang.Throwable /error 404 /error /error Having the custom error pages defined in our web.xml, we need to add the Spring MVC @Controller. The customError handler method wraps the information, that we retrieve from the request, and returns it to the view. @Controller class CustomErrorController { @RequestMapping("error") public String customError(HttpServletRequest request, HttpServletResponse response, Model model) { // retrieve some useful information from the request Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code"); Throwable throwable = (Throwable) request.getAttribute("javax.servlet.error.exception"); // String servletName = (String) request.getAttribute("javax.servlet.error.servlet_name"); String exceptionMessage = getExceptionMessage(throwable, statusCode); String requestUri = (String) request.getAttribute("javax.servlet.error.request_uri"); if (requestUri == null) { requestUri = "Unknown"; } String message = MessageFormat.format("{0} returned for {1} with message {3}", statusCode, requestUri, exceptionMessage ); model.addAttribute("errorMessage", message); return "customError"; } private String getExceptionMessage(Throwable throwable, Integer statusCode) { if (throwable != null) { return Throwables.getRootCause(throwable).getMe