I migrated from Spring 3 to Spring 5 and found out the WebMvcConfigurerAdapter class is deprecated; what should we do?
SpringWebConfig.java
package com.mkyong.helloworld.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
@EnableWebMvc
@Configuration
@ComponentScan({ "com.mkyong.helloworld.web" })
public class SpringWebConfig extends WebMvcConfigurerAdapter {
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
}
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setViewClass(JstlView.class);
viewResolver.setPrefix("/WEB-INF/views/jsp/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
}
The WebMvcConfigurerAdapter is deprecated
Since Spring 3.1, the WebMvcConfigurerAdapter is an implementation of WebMvcConfigurer with empty methods, which allow subclasses to override the needed methods.
Since Spring 5 with Java 8 baseline allows default methods, the adapter class WebMvcConfigurerAdapter is no longer required.
WebMvcConfigurerAdapter.java
@Deprecated
public abstract class WebMvcConfigurerAdapter implements WebMvcConfigurer {
//...
}
Solution – WebMvcConfigurer
Since Spring 5 and above, we can implement the WebMvcConfigurer directly and override the needed methods.
.java
package com.mkyong.helloworld.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
@EnableWebMvc
@Configuration
@ComponentScan({ "com.mkyong.helloworld.web" })
public class SpringWebConfig implements WebMvcConfigurer {
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
}
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setViewClass(JstlView.class);
viewResolver.setPrefix("/WEB-INF/views/jsp/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
}
Download Source Code
$ git clone https://github.com/mkyong/spring-mvc/
$ cd spring-mvc-hello-world
$ mvn clean jetty:run
visit http://localhost:8080/spring
