Spring MVC 404错误页面

Question

I have Global exception handler defined using ControllerAdvice, for IOException, I am returning 404.

@ResponseStatus(HttpStatus.NOT_FOUND)
@ExceptionHandler(IOException.class)
public void handleIOException(){
    logger.error("IOException");
    //returning 404 error code
}

web.xml file

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>

<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- Processes application requests -->
<servlet>
    <servlet-name>appServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/appServlet/spring.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>appServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<error-page>
    <error-code>404</error-code>
    <location>/resources/404.jsp</location>
</error-page>

I am deliberately throwing IOException in a controller, but it's not using the 404 error page. If I give some random URL, the 404 page is getting used.

I am confused why it's not working with exception handler.

Answer 1

It seems to be working fine now, after I deleted the project from tomcat webapps and did a fresh deploy. May be some issues with tomcat hot deployment.

So when my controller is throwing 404 error, tomcat container is looking at the error-page configured for it and sending configured error-page as response.