HTTP Status 404 - Not Found in Spring 3.2.7

Question

I am using Spring 3.2.7, I have Login.jsp file which takes the input and should display the output on hello.jsp, it takes the input but does not show an output instead it throws an error as HTTP Status 404 - Not Found. Here is the code:

@Controller
public class HelloWorldController {

    @RequestMapping("/hello")
    public ModelAndView helloWorld(HttpServletRequest request, HttpServletResponse response) {
        String name = request.getParameter("name");
        String password = request.getParameter("password");
        if (password.equals("admin")) {
            String message = "Hello " + name;
            return new ModelAndView("hellopage", "message", message);
        } else {
            return new ModelAndView("errorpage", "message", "Sorry Username or Password Error");
        }
    }
}

Dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.1.xsd">

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

  <bean id="viewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver"
    p:prefix="/WEB-INF/jsp/"
    p:suffix=".jsp" />

</beans>

Answer 1

After observing your Dispatcher-servlet.xml, I can see you are missing <mvc:annotation-driven/> Your Updated code will look like below

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
                http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                http://www.springframework.org/schema/context
                http://www.springframework.org/schema/context/spring-context-3.0.xsd"
                   http://www.springframework.org/schema/mvc   http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">                                            

        <mvc:annotation-driven/>  
        <context:component-scan base-package="mypack" />
        <bean id="viewResolver"   class="org.springframework.web.servlet.view.InternalResourceViewResolver"
        p:prefix="/WEB-INF/jsp/"
        p:suffix=".jsp" />
        </beans>

Explanation

<mvc:annotation-driven/> means that you can define spring beans dependencies without actually having to specify a bunch of elements in xml or implement an interface or extend a base class.Means @Controller tells spring that the the class specified contains methods that will handle http requests without you having to implement the Controller interface or extend a subclass that implements controller.

<context:component-scan base-package="mypack /> tells spring that it should search the class path for all the classes under mypack and look at each class to see if it has a @Controller, or @Repository, or @Service, or @Component and if it does then Spring will register the class with the bean factory as if you have defined in in the xml configuration files

Answer 2

No, I made changes in Dispatcher-servlet.xml as:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:p="http://www.springframework.org/schema/p"
   xmlns:aop="http://www.springframework.org/schema/aop"
   xmlns:tx="http://www.springframework.org/schema/tx"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
   http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
   http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
">

<context:component-scan base-package="mypack" />
<mvc:annotation-driven />

<bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver"
      p:prefix="/WEB-INF/jsp/"
      p:suffix=".jsp" />
</beans>

still am getting an error as "Status 404 - Not Found" when i submit the form.

Form:

<form action="hello.htm" method="post">
        Name: <input type="text" name="name" /><br>
        Password: <input type="password" name="password" />
        <input type="submit" value="Login" />
    </form>

Here is the Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>
<session-config>
    <session-timeout>
        30
    </session-timeout>
</session-config>
<welcome-file-list>
    <welcome-file>Login.jsp</welcome-file>
</welcome-file-list>
</web-app>