SpringMVC & Spring in Action: can't redirect t

Question

I'm learning SpringMVC and maven these days with the book Spring in Action but i have a question now. The default request to "/" should be mapped to "home.jsp" but not. You can also see the same question described in the book forum. https://forums.manning.com/posts/list/38046.page Here are the codes:

package spittr.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class SpittrWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{

    @Override
    protected String[] getServletMappings(){
        return new String[]{ "/" };
    }

    @Override
    protected Class<?>[] getRootConfigClasses(){
        return new Class<?>[]{ RootConfig.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses(){
        return new Class<?>[]{ WebConfig.class };
    }
}

---

package spittr.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

@Configuration
@EnableWebMvc
@ComponentScan("spittr.web")
public class WebConfig extends WebMvcConfigurerAdapter{

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        return resolver;
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer){
        configurer.enable();
    }
}

---

 package spittr.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

@Configuration
@ComponentScan(basePackages={"spitter"}, excludeFilters={
    @Filter(type=FilterType.ANNOTATION, value=EnableWebMvc.class)
})
public class RootConfig {

}

---

package spittr.web;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class HomeController {

    @RequestMapping(value="/", method=RequestMethod.GET)
    public String home(){
        return "home";
    }
}

When i run this on tomcat 7.0, it should show home.jsp. However it still shows index.jsp.

-------------------- update -------------------------

The following test class indicates the controller class is right and this controller can response to the request "/" with home.jsp. So, where is wrong?

package spittr.web;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;
import org.junit.Test;
import org.springframework.test.web.servlet.MockMvc;

public class HomeControllerTest {

    @Test
    public void testHomePage() throws Exception{
        HomeController controller = new HomeController();
        MockMvc mockMvc = standaloneSetup(controller).build();
        mockMvc.perform(get("/")).andExpect(view().name("home"));   
    }
}

Answer 1

update or add in your web.xml

<welcome-file-list>home.jsp</welcome-file-list>

If you do not have web.xml you can generate by

Dynamic Web Project –> RightClick –> Java EE Tools –> Generate Deployment Descriptor Stub.

Also you can do JSP redirect using JSTL libraries in index.jsp to redirect to home.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<c:redirect url="/home.jsp"/>

Answer 2

I had the same issue while working on Eclipse, Tomcat 9.0 on my Mac. I have spend hours to see (this small code) that where I was wrong.

However, I was able to make it run on Windows machine with Eclipse and Tomcat 8.5 and 9.0 .

I have the code hosted on GitHub at https://github.com/shortduck/ManningChapter5_SpringMVC

This is a Maven project and not Gradle. Also see the HomeController has the value as value = "/home", this is working as well as '/' will work too. If you have having value as '/' make sure index.jsp or any other "home" page is not on the root.

My next target to find out why is this code not working on Mac.

Answer 3

seems to be a path problem.

First check your path mapping in web.xml file for exact url-pattern for which you are redirecting to dispatcher servlet.Assuming that you have home.jsp views created under

 /WEB-INF/views/ 

folder.