[Spring]Get images from external resources: Issue with @EnableWebMvc and WebMvcConfigurationSupport

[Deparis Momo]

I have created a spring boot application and I am trying to get images from external folder on disk, here is my code:

import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

 @Configuration
 @EnableWebMvc
 @ComponentScan
 public class WebConfigurer implements WebMvcConfigurer {
 private static String UPLOAD_DIR = "D:\\upload";


@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("/images/**").addResourceLocations("file:" + UPLOAD_DIR+"/");
}
}

But when I launch the application, I got this error message:

> o.s.web.servlet.PageNotFound: No mapping for GET /myapp/index
> o.s.b.w.servlet.support.ErrorPageFilter  : Cannot forward to error
> page for request [/] as the response has already been committed.

Even if I remove @EnableWebMvc and I extend WebMvcConfigurationSupport directly, I am getting the same issue.

 1.  Why am I getting this issue?

 2. Is it possible to get images from external resources without using @EnableWebMvc or WebMvcConfigurationSupport?

Thanks

[Al Hobbs]

where is myapp/index coming from?  I don't see that in the code.

[Deparis Momo]

Here is my WelcomeController Class:

import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class WelcomeController {

	@RequestMapping(value = "/", method = RequestMethod.GET)
	public String showWelcomePage(ModelMap model) {
		model.put("name", getLoggedinUserName());
		return "index";
	}
	
	private String getLoggedinUserName() {
		Object principal = SecurityContextHolder.getContext()
				.getAuthentication().getPrincipal();
		
		if (principal instanceof UserDetails) {
			return ((UserDetails) principal).getUsername();
		}
		
		return principal.toString();
	}

}

And my spring security Class:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.password.NoOpPasswordEncoder;

@Configuration
public class SecurityConfiguration extends WebSecurityConfigurerAdapter{
	@Autowired
    public void configureGlobalSecurity(AuthenticationManagerBuilder auth)
            throws Exception {
        auth.inMemoryAuthentication()
            .passwordEncoder(NoOpPasswordEncoder.getInstance())
        		.withUser("admin").password("ad")
                .roles("USER", "ADMIN");
    }
	
	@Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().antMatchers("/login", "/h2-console/**").permitAll()
                .antMatchers("/", "/*todo*/**").access("hasRole('USER')").and()
                .formLogin();
        
        http.csrf().disable();
        http.headers().frameOptions().disable();
    }
}

[Himai Minh]

Hi, Deparis,
What is your project structure?
You may need to put the images under webapp folder and see if that works first.
Reference:
https://stackoverflow.com/questions/37240513/o-s-boot-context-web-errorpage-cannot-forward-to-error-page-for-request-as

[Deparis Momo]

Ok I resolved the problem. Firstly I removed @EnableWebMvc and WebMvcConfigurationSupport, then I noted that there was an issue in the url. I put :

.addResourceLocations("file:/opt/files/");

Instead of:

.addResourceLocations("file:///C:/opt/files/");

As I am a Windows user.

Thanks