URL映射未触发控制器

Question

I am following along in the book Spring in Action trying to build the Spittr application. I created my configuration classes and home controller, but when I call localhost:8080/ I get a 404.

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Project

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SpittrWebAppInitializer.java

package com.hamerm.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("com.hamerm.spittr.web.controllers")
public class WebConfig extends WebMvcConfigurerAdapter {

    @Bean
    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();
    }

}

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WebConfig.java

 package com.hamerm.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("com.hamerm.spittr.web.controllers") public class WebConfig extends WebMvcConfigurerAdapter { @Bean 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(); } } 

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RootConfig.java

<?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">


</web-app>

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HomeController.java

 package com.hamerm.spittr.web.controllers; 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"; } } 

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web.xml (I removed the config that eclipse put in here by default when making a new Spring Web MVC projectbecause it was complaining about multiple context listeners)

 <?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"> </web-app> 

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I have tried navigating to http://localhost:8080/Spittr/ , http://localhost:8080/ , and http://localhost:8080 . All result in a 404. No exceptions show up in the Java console though, so it's like its not even registering the request.

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This is a part of what the console prints when I run my application

 INFO: 1 Spring WebApplicationInitializers detected on classpath Sep 21, 2016 2:21:43 PM org.apache.catalina.core.ApplicationContext log INFO: Initializing Spring root WebApplicationContext INFO : org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization started INFO : org.springframework.web.context.support.AnnotationConfigWebApplicationContext - Refreshing Root WebApplicationContext: startup date [Wed Sep 21 14:21:43 EDT 2016]; root of context hierarchy INFO : org.springframework.web.context.support.AnnotationConfigWebApplicationContext - Registering annotated classes: [class com.hamerm.spittr.config.RootConfig] INFO : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor - JSR-330 'javax.inject.Inject' annotation found and supported for autowiring INFO : org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 2062 ms Sep 21, 2016 2:21:45 PM org.apache.catalina.core.ApplicationContext log INFO: Initializing Spring FrameworkServlet 'dispatcher' INFO : org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcher': initialization started INFO : org.springframework.web.context.support.AnnotationConfigWebApplicationContext - Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed Sep 21 14:21:45 EDT 2016]; parent: Root WebApplicationContext INFO : org.springframework.web.context.support.AnnotationConfigWebApplicationContext - Registering annotated classes: [class com.hamerm.spittr.config.WebConfig] INFO : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor - JSR-330 'javax.inject.Inject' annotation found and supported for autowiring INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/],methods=[GET]}" onto public java.lang.String com.hamerm.spittr.web.controllers.HomeController.home() INFO : org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler] INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter - Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed Sep 21 14:21:45 EDT 2016]; parent: Root WebApplicationContext INFO : org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcher': initialization completed in 1649 ms Sep 21, 2016 2:21:46 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["http-nio-8080"] Sep 21, 2016 2:21:46 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["ajp-nio-8009"] Sep 21, 2016 2:21:46 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 9745 ms 

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What do I need to do to get my application running? Thanks!

Answer 1

I didn't post my pom.xml because I didn't think it was relevant. Apparently it was.

The culprit that was this line <version>1.0.0-BUILD-SNAPSHOT</version>

Made the resulting war file have that version appended to the name, which meant it had to be at the end of the url I use to access the application.

The solution was to add this to the <build> section of pom.xml

<finalName>${project.artifactId}</finalName>

now the resulting war was simply named spittr.war and I was able to access the application at localhost:8080/spittr

Answer 2

INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/],methods=[GET]}" onto public java.lang.String com.hamerm.spittr.web.controllers.HomeController.home()

This indicates the entry has been registered and it should be triggered.

There is one another method where a welcome file can be triggered using below. Add this to your WebConfig which adds home.jsp as your welcome file.

  @Override
  public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/").setViewName("home");
  }

If this works, then try with other endpoints as suggested, so that gives the base to access to application.