Spring Boot OAuth2 - Could not obtain user details from token
<p>I searched the web for solution of this problem but didn't find any working solution. I'm trying to setup basic Spring Boot OAuth2 Authorization Provider and Client.</p>
<p>I followed official Spring Boot instructions and created single sign on with Facebook and Github. Then i followed instructions to create Secure Spring Boot Web application.</p>
<p>I wanted to create my own Authorization Server so I added @EnableAuthorizationServer annotation to Secure Web Application as explained <a href="https://spring.io/guides/tutorials/spring-boot-oauth2/#_social_login_authserver" rel="noreferrer">here</a>. I also added  details of an OAuth2 client as described in a link. I followed further instructions and created a OAuth2 Client.</p>
<p>I start both applications, visit 127.0.0.1:9999 to open a Client, client redirects me to localhost:8080/login, I enter user details and Authentication Provider redirects me to 127.0.0.1:9999/login and I get an error message:</p>
<blockquote>
<p>Authentication Failed: Could not obtain user details from token</p>
</blockquote>
<p>This is what gets logged:</p>
<blockquote>
<p>INFO 2800 --- [nio-9999-exec-3] o.s.b.a.s.o.r.UserInfoTokenServices      : Getting user info from: http:// localhost:8080/me</p>
<p>DEBUG 2800 --- [nio-9999-exec-3] o.s.s.oauth2.client.OAuth2RestTemplate   : Created GET request for http:// localhost:8080/me</p>
<p>DEBUG 2800 --- [nio-9999-exec-3] o.s.s.oauth2.client.OAuth2RestTemplate   : Setting request Accept header to [application/json, application/*+json]</p>
<p>DEBUG 2800 --- [nio-9999-exec-3] o.s.s.oauth2.client.OAuth2RestTemplate   : GET request for http:// localhost:8080/me resulted in 200 (OK)</p>
<p>INFO 2800 --- [nio-9999-exec-3] o.s.b.a.s.o.r.UserInfoTokenServices      : Could not fetch user details: class org.springframework.web.client.RestClientException, Could not extract response: no suitable HttpMessageConverter found for response type [interface java.util.Map] and content type [text/html;charset=UTF-8]]</p>
</blockquote>
<p>This is my Client application:</p>
<pre><code>@EnableAutoConfiguration
@Configuration
@EnableOAuth2Sso
@RestController
public class ClientApplication {
    
    @RequestMapping(&quot;/&quot;)
    public String home(Principal user) {
        return &quot;Hello &quot; + user.getName();
    }

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

}
</code></pre>
<p>This is client application YML:</p>
<pre><code>server:
  port: 9999
security:
  oauth2:
    client:
      client-id: acme
      client-secret: acmesecret
      access-token-uri: http://localhost:8080/oauth/token
      user-authorization-uri: http://localhost:8080/oauth/authorize
    resource:
      user-info-uri: http://localhost:8080/me
</code></pre>
<p>This is my Authorization Provider application:</p>
<pre><code>@SpringBootApplication
public class SecurityApp {

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

}

@Configuration
@EnableWebSecurity
@EnableAuthorizationServer
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers(&quot;/&quot;, &quot;/home&quot;).permitAll()
                .anyRequest().authenticated()
                .and()
            .formLogin()
                .loginPage(&quot;/login&quot;)
                .permitAll()
                .and()
            .logout()
                .permitAll();
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .inMemoryAuthentication()
                .withUser(&quot;user&quot;).password(&quot;password&quot;).roles(&quot;USER&quot;);
    }
}

@Configuration
public class MvcConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController(&quot;/home&quot;).setViewName(&quot;home&quot;);
        registry.addViewController(&quot;/&quot;).setViewName(&quot;home&quot;);
        registry.addViewController(&quot;/hello&quot;).setViewName(&quot;hello&quot;);
        registry.addViewController(&quot;/login&quot;).setViewName(&quot;login&quot;);
    }

}

@RestController
public class Controller {

    @RequestMapping({ &quot;/user&quot;, &quot;/me&quot; })
    public Map&lt;String, String&gt; user(Principal principal) {
      Map&lt;String, String&gt; map = new LinkedHashMap&lt;&gt;();
      map.put(&quot;name&quot;, principal.getName());
      return map;
    }
}
</code></pre>
<p>This is Application Provider YML:</p>
<pre><code>security:
  oauth2:
    client:
      client-id: acme
      client-secret: acmesecret
      scope: read,write
      auto-approve-scopes: '.*'
</code></pre>