无法运行具有Thymeleaf支持的Spring Boot WebMVC

Question

I have search a lot but I did not find answer to my question, So I am posting my question here. Please look and suggest me the solution where I am mistaken.

I have created spring boot web mvc project with thymeleaf support using Spring Tool Suite(STS). When I run it give me "Whitelabel Error Page" page. Which means mapping not found.

Efforts:

WebConfig.java

package com.springthymeleaf.config;

import org.springframework.boot.context.embedded.ServletRegistrationBean;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.thymeleaf.spring4.SpringTemplateEngine;
import org.thymeleaf.spring4.view.ThymeleafViewResolver;
import org.thymeleaf.templateresolver.ServletContextTemplateResolver;

@Configuration
@ComponentScan("com.springthymeleaf")
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter  {

    @Bean
    ServletRegistrationBean servletRegistration(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean();
        registrationBean.addUrlMappings("/console/*");
        return registrationBean;
    }

    //start Thymeleaf specific configuration
    @Bean(name ="templateResolver") 
    public ServletContextTemplateResolver getTemplateResolver() {
        ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver();
//      templateResolver.setPrefix("/templates/");
        templateResolver.setSuffix(".html");
        templateResolver.setTemplateMode("XHTML");
    return templateResolver;
    }
    @Bean(name ="templateEngine")       
    public SpringTemplateEngine getTemplateEngine() {
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(getTemplateResolver());
    return templateEngine;
    }
    @Bean(name="viewResolver")
    public ThymeleafViewResolver getViewResolver(){
        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver(); 
        viewResolver.setTemplateEngine(getTemplateEngine());
    return viewResolver;
    }
    //end Thymeleaf specific configuration
    @Bean(name ="messageSource")
    public MessageSource getMessageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("/WEB-INF/i18/thymeleafResource");
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }
}

SecurityConfiguration.java

package com.springthymeleaf.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@Configuration
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
        httpSecurity.authorizeRequests().antMatchers("/").permitAll();
    }
}

ServletInitializer.java

package com.springthymeleaf;

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;

public class ServletInitializer extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringThymeLeafApplication.class);
    }

}

SpringThymeLeafApplication.java

package com.springthymeleaf;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringThymeLeafApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringThymeLeafApplication.class, args);
    }
}

IndexController.java

package com.springthymeleaf.controllers;


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

@Controller
public class IndexController {

    @RequestMapping("/")
    public String index(){
        return "index";
    }
}

I have created index.html file in resources/templates folder. Still I am getting that error. I have searched a lot on web, but did not get clue. Please somebody help me.

Answer 1

Actually Spring Boot configures Thymeleaf out of the box. It should work with the following setup:

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter
{
    @Override
    protected void configure(HttpSecurity http) throws Exception
    {
        http
            .authorizeRequests()
                .anyRequest().authenticated()
                .and()
            .formLogin().loginPage("/login").defaultSuccessUrl("/").permitAll() // http://docs.spring.io/spring-security/site/docs/4.0.3.RELEASE/reference/htmlsingle/#jc-form
                .and()
            .logout().permitAll(); // http://docs.spring.io/spring-security/site/docs/4.0.3.RELEASE/reference/htmlsingle/#jc-logout
    }

    @Override
    public void configure(WebSecurity web) throws Exception
    {
        web
            .ignoring()
                .antMatchers("/resources/**"/*, ... */);
    }
}

@Controller
public class LoginController
{
    @RequestMapping("/login")
    static String login(Model model)
    {
        return "login";
    }
}

Answer 2

Spring Boot already configures Thymeleaf for you, so no need to configure that manually. Remove all Thymeleaf related configuration, also remove @EnableWebMvc as that interferes with the Spring Boot auto configuration. The @ComponentScan is also redundant.

Spring Boot also registered a MessageSource for you so no need to configure that. Not sure what the servlet registration is you do but that is the only thing you need.

Also I suggest to remove your controller and use a view controller which you can configure in your WebConfig class. Saves you a controller.

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter  {

    @Bean
    ServletRegistrationBean servletRegistration(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean();
        registrationBean.addUrlMappings("/console/*");
        return registrationBean;
    }

    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
    }
}

To let the auto configured message source pickup your custom bundles add the following to src/main/resources/application.properties .

spring.messages.basename=/WEB-INF/i18/thymeleafResource

I would also suggest to simply let the SpringThymeLeafApplication extend the SpringBootServletInitializer .

@SpringBootApplication
public class SpringThymeLeafApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(SpringThymeLeafApplication.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringThymeLeafApplication.class);
    }
}

Also make sure that your templates are in src/main/resources/templates and not in src/main/resources/resources/templates else those will not be found.

Answer 3

Spring boot does all the automatic configuration when you add the thymeleaf dependency. then you should do the following.

1. Remove all the thymeleaf configuration you have on your WebConfig.java

2. Make sure you have the following dependency your pom.xml if you are using Maven, otherwise check the spring website for the equivalent if you are using gradle:

    <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> 

3. thirdly you make sure that you scanning where your controllers are, add the following on your SpringThymeLeafApplication.java:

   @ComponentScan(basePackages = "your.path.to.controllers")

4. Finally you have to add your .html files to resources/templates