Unable to find controller in spring web mvc

Question

It seems that dispatcher-servlet unable to perform component scan using.

 <context:component-scan  base-package="abc" />

In my controller file (HelloController.java) under package abc. Code is written as follows:

@Controller
@RequestMapping("/hello")
public class HelloController {

@RequestMapping(method = RequestMethod.GET)
public String printHello(ModelMap model) {
    model.addAttribute("message", "Hello Spring MVC Framework!");
    return "hello"; //I have already made hello.jsp in web-inf/jsp/
 }
}

My Application name is SpringMiddle. When try url as:

http://localhost:8080/SpringMiddle/hello.htm

I do have following url pattern in web.xml

 <servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>

It shows me error HTTP 404 not found.

EDIT: : it shows me warning

WARNING:   No mapping found for HTTP request with URI [/SpringMiddle/hello.htm] in DispatcherServlet with name 'dispatcher'

Solution 1

You have to enable MVC in Spring. In xml config you can do it in such way:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <mvc:annotation-driven />

</beans>

and in JavaConfig:

@Configuration
@EnableWebMvc
public class WebConfig {

}

Please refer to Spring documentation

Solution 2

if you are referring to an mkyong tutorial, I didn't use the annotations: @Configuration @EnableWebMvc, problem is you are using both annotations and xml declaration.

Annotation for setting the url:

@Controller
@RequestMapping("/hello")

you should remove this part:

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>

and you'll be able to visit the url:

http://localhost:8080/SpringMiddle/hello

Also make sure you have this in your web.xml:

<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>
                   org.springframework.web.servlet.DispatcherServlet
            </servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

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

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/dispatcher-servlet.xml</param-value> 
</context-param>
<listener>
    <listener-class>
                  org.springframework.web.context.ContextLoaderListener
            </listener-class>
</listener>

the dispatcher-servlet.xml is where the component scanning is declared