Q:

Null @AuthenticationPrincipal with Spring-Boot / Security

I setup my Spring Security application according to the reference document and after hours of troubleshooting I continue to get a null @AuthenticationPrincipal passed into my controller. 
The authentication mechanism is working fine against the users in my database but still a null @AuthenticationPrincipal. I consulted several internet posts including this, and this but still I am getting null.
I am using Spring-Boot 1.2.2 and Spring Security 3.2.6.
Relevant POM:
<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>1.2.2.RELEASE</version>
  <relativePath/>
</parent>

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

Application:
@SpringBootApplication
public class AuditWebApplication {
  // code
}

WebSecurityConfigurerAdapter:
@Configuration
@Order(SecurityProperties.ACCESS_OVERRIDE_ORDER)
@EnableGlobalMethodSecurity(prePostEnabled=true)
@EnableWebMvcSecurity
public class SecurityConfiguration WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .httpBasic()
            .and()
            .logout()
            .logoutSuccessUrl("/#/login")
            .and()
            .authorizeRequests()
            .antMatchers("/index.html", "/views/**", // public side.
                        "/images/**", "/scripts/**", "/styles/**", "/vendor/**", "/")
            .permitAll()
            .anyRequest().authenticated().and().csrf()
            .csrfTokenRepository(csrfTokenRepository()).and()
            .addFilterAfter(csrfHeaderFilter(), SessionManagementFilter.class);
    }

UserDetailsService:
@Transactional
@Service
public class UserServiceBean implements UserService {
  @Override
  public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    // Custom domain User object, not spring security
    User user = userRepository.findByusername(username);
    if(user == null) {
      throw new UsernameNotFoundException("Unable to load user by username = '" + username + "'");
    }
    List<UserRole> userRoles = userRoleRepository.findAllByUserId(user.getId());
    user.setUserRoles(userRoles);
    return new UserRepositoryUserDetails(user);
  }

  // User here refers to my application's domain User object, not Spring Security
  private final static class UserRepositoryUserDetails extends User implements UserDetails {

    public UserRepositoryUserDetails(User user) {
      super(user);
    }

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
      List<String> authoritiesList = new ArrayList<String>();
      List<UserRole> userRoles = getUserRoles();
      userRoles.forEach((ur) -> {
        if(ur.isActive()) {
          authoritiesList.add(ur.getRoleDesc());
        }
      });

      String authoritiesString = StringUtils.join(authoritiesList, ',');
      return AuthorityUtils.commaSeparatedStringToAuthorityList(authoritiesString);
    }

    @Override
    public String getUsername() {
      return getLdapUID();
    }

    @Override
    public boolean isAccountNonExpired() {
      return true;
    }

    @Override
    public boolean isAccountNonLocked() {
      return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
      return true;
    }

    @Override
    public boolean isEnabled() {
      return isActive() ;
    }

    @Override
    public String getPassword() {
        // fake for now
      return "password";
    }

  }

}

public interface UserService extends UserDetailsService {
  // signatures
}

Controller:
import org.springframework.security.web.bind.annotation.AuthenticationPrincipal;
import org.springframework.security.core.userdetails.User;

@RequestMapping(value="/products", method=RequestMethod.GET)
public ResponseEntity<Map<String,Object>> products(@AuthenticationPrincipal User user){
  // user is null
}

Relevant Maven Dependency Tree:
[INFO] ------------------------------------------------------------------------
[INFO] Building Web Project 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.9:tree (default-cli) @ web-build ---
[WARNING] Using Maven 2 dependency tree to get verbose output, which may be inconsistent with actual Maven 3 resolution
[INFO] com.company:web-build:jar:0.0.1-SNAPSHOT
[INFO] +- com.company:common-build:jar:0.0.1-SNAPSHOT:compile
[INFO] |  +- (org.springframework.boot:spring-boot-starter-aop:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  \- (org.springframework.boot:spring-boot-starter-security:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] +- com.company:data-build:jar:0.0.1-SNAPSHOT:compile
[INFO] |  +- (com.company:common-build:jar:0.0.1-SNAPSHOT:compile - omitted for duplicate)
[INFO] |  +- (org.springframework.boot:spring-boot-starter-security:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  +- (org.springframework.boot:spring-boot-starter-jdbc:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  +- (org.springframework.boot:spring-boot-starter-aop:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.4.5:compile
[INFO] |  +- (org.apache.commons:commons-lang3:jar:3.3.2:compile - omitted for duplicate)
[INFO] |  \- org.springframework.boot:spring-boot-starter-jetty:jar:1.2.2.RELEASE:compile
[INFO] |     +- org.eclipse.jetty:jetty-jsp:jar:9.2.9.v20150224:compile
[INFO] |     |  +- org.eclipse.jetty.toolchain:jetty-schemas:jar:3.1.M0:compile
[INFO] |     |  +- javax.servlet:javax.servlet-api:jar:3.1.0:compile
[INFO] |     |  +- javax.servlet.jsp:javax.servlet.jsp-api:jar:2.3.1:compile
[INFO] |     |  +- org.glassfish.web:javax.servlet.jsp:jar:2.3.2:compile
[INFO] |     |  |  +- (org.glassfish:javax.el:jar:3.0.0:compile - omitted for duplicate)
[INFO] |     |  |  \- (javax.servlet.jsp:javax.servlet.jsp-api:jar:2.3.1:compile - omitted for duplicate)
[INFO] |     |  +- org.eclipse.jetty.orbit:javax.servlet.jsp.jstl:jar:1.2.0.v201105211821:compile
[INFO] |     |  +- org.glassfish.web:javax.servlet.jsp.jstl:jar:1.2.2:compile
[INFO] |     |  +- org.glassfish:javax.el:jar:3.0.0:compile
[INFO] |     |  \- org.eclipse.jetty.orbit:org.eclipse.jdt.core:jar:3.8.2.v20130121:compile
[INFO] |     +- org.eclipse.jetty:jetty-webapp:jar:9.2.9.v20150224:compile
[INFO] |     |  +- org.eclipse.jetty:jetty-xml:jar:9.2.9.v20150224:compile
[INFO] |     |  |  \- org.eclipse.jetty:jetty-util:jar:9.2.9.v20150224:compile
[INFO] |     |  \- org.eclipse.jetty:jetty-servlet:jar:9.2.9.v20150224:compile
[INFO] |     |     \- org.eclipse.jetty:jetty-security:jar:9.2.9.v20150224:compile
[INFO] |     |        \- org.eclipse.jetty:jetty-server:jar:9.2.9.v20150224:compile
[INFO] |     |           +- (javax.servlet:javax.servlet-api:jar:3.1.0:compile - omitted for duplicate)
[INFO] |     |           +- (org.eclipse.jetty:jetty-http:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |           \- (org.eclipse.jetty:jetty-io:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     +- org.eclipse.jetty.websocket:websocket-server:jar:9.2.9.v20150224:compile
[INFO] |     |  +- org.eclipse.jetty.websocket:websocket-common:jar:9.2.9.v20150224:compile
[INFO] |     |  |  +- org.eclipse.jetty.websocket:websocket-api:jar:9.2.9.v20150224:compile
[INFO] |     |  |  +- (org.eclipse.jetty:jetty-util:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |  |  \- org.eclipse.jetty:jetty-io:jar:9.2.9.v20150224:compile
[INFO] |     |  |     \- (org.eclipse.jetty:jetty-util:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |  +- org.eclipse.jetty.websocket:websocket-client:jar:9.2.9.v20150224:compile
[INFO] |     |  |  +- (org.eclipse.jetty:jetty-util:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |  |  +- (org.eclipse.jetty:jetty-io:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |  |  \- (org.eclipse.jetty.websocket:websocket-common:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |  +- org.eclipse.jetty.websocket:websocket-servlet:jar:9.2.9.v20150224:compile
[INFO] |     |  |  +- (org.eclipse.jetty.websocket:websocket-api:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |  |  \- (javax.servlet:javax.servlet-api:jar:3.1.0:compile - omitted for duplicate)
[INFO] |     |  +- (org.eclipse.jetty:jetty-servlet:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     |  \- org.eclipse.jetty:jetty-http:jar:9.2.9.v20150224:compile
[INFO] |     |     \- (org.eclipse.jetty:jetty-util:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |     \- org.eclipse.jetty.websocket:javax-websocket-server-impl:jar:9.2.9.v20150224:compile
[INFO] |        +- org.eclipse.jetty:jetty-annotations:jar:9.2.9.v20150224:compile
[INFO] |        |  +- org.eclipse.jetty:jetty-plus:jar:9.2.9.v20150224:compile
[INFO] |        |  |  +- (org.eclipse.jetty:jetty-webapp:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |        |  |  \- org.eclipse.jetty:jetty-jndi:jar:9.2.9.v20150224:compile
[INFO] |        |  |     \- (org.eclipse.jetty:jetty-util:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |        |  +- (org.eclipse.jetty:jetty-webapp:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |        |  +- javax.annotation:javax.annotation-api:jar:1.2:compile
[INFO] |        |  +- org.ow2.asm:asm:jar:5.0.1:compile
[INFO] |        |  \- org.ow2.asm:asm-commons:jar:5.0.1:compile
[INFO] |        |     \- org.ow2.asm:asm-tree:jar:5.0.1:compile
[INFO] |        |        \- (org.ow2.asm:asm:jar:5.0.1:compile - omitted for duplicate)
[INFO] |        +- org.eclipse.jetty.websocket:javax-websocket-client-impl:jar:9.2.9.v20150224:compile
[INFO] |        |  +- (org.eclipse.jetty.websocket:websocket-client:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |        |  \- (javax.websocket:javax.websocket-api:jar:1.0:compile - omitted for duplicate)
[INFO] |        +- (org.eclipse.jetty.websocket:websocket-server:jar:9.2.9.v20150224:compile - omitted for duplicate)
[INFO] |        \- javax.websocket:javax.websocket-api:jar:1.0:compile
[INFO] +- org.springframework.boot:spring-boot-starter-security:jar:1.2.2.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter:jar:1.2.2.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot:jar:1.2.2.RELEASE:compile
[INFO] |  |  |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  |  \- (org.springframework:spring-context:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- org.springframework.boot:spring-boot-autoconfigure:jar:1.2.2.RELEASE:compile
[INFO] |  |  |  +- (org.springframework.boot:spring-boot:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  |  |  \- org.yaml:snakeyaml:jar:1.14:compile
[INFO] |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:1.2.2.RELEASE:compile
[INFO] |  |  |  +- org.slf4j:jcl-over-slf4j:jar:1.7.10:compile
[INFO] |  |  |  |  \- org.slf4j:slf4j-api:jar:1.7.10:compile (version managed from 1.7.6)
[INFO] |  |  |  +- org.slf4j:jul-to-slf4j:jar:1.7.10:compile
[INFO] |  |  |  |  \- (org.slf4j:slf4j-api:jar:1.7.10:compile - version managed from 1.7.6; omitted for duplicate)
[INFO] |  |  |  +- org.slf4j:log4j-over-slf4j:jar:1.7.10:compile
[INFO] |  |  |  |  \- (org.slf4j:slf4j-api:jar:1.7.10:compile - version managed from 1.7.6; omitted for duplicate)
[INFO] |  |  |  \- ch.qos.logback:logback-classic:jar:1.1.2:compile
[INFO] |  |  |     +- ch.qos.logback:logback-core:jar:1.1.2:compile
[INFO] |  |  |     \- (org.slf4j:slf4j-api:jar:1.7.10:compile - version managed from 1.7.6; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  \- (org.yaml:snakeyaml:jar:1.14:compile - scope updated from runtime; omitted for duplicate)
[INFO] |  +- org.springframework:spring-beans:jar:4.1.5.RELEASE:compile
[INFO] |  |  \- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- org.springframework:spring-context:jar:4.1.5.RELEASE:compile
[INFO] |  |  +- (org.springframework:spring-aop:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  \- (org.springframework:spring-expression:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- org.springframework:spring-core:jar:4.1.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-expression:jar:4.1.5.RELEASE:compile
[INFO] |  |  \- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- org.springframework:spring-web:jar:4.1.5.RELEASE:compile (version managed from 3.2.8.RELEASE)
[INFO] |  |  +- (org.springframework:spring-aop:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-context:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  \- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- org.springframework.security:spring-security-config:jar:3.2.6.RELEASE:compile
[INFO] |  |  +- aopalliance:aopalliance:jar:1.0:compile
[INFO] |  |  +- org.springframework.security:spring-security-core:jar:3.2.6.RELEASE:compile
[INFO] |  |  |  +- (aopalliance:aopalliance:jar:1.0:compile - omitted for duplicate)
[INFO] |  |  |  +- (org.springframework:spring-aop:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  |  +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  |  +- (org.springframework:spring-context:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  |  \- (org.springframework:spring-expression:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-aop:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-context:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  \- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- org.springframework.security:spring-security-web:jar:3.2.6.RELEASE:compile
[INFO] |  |  +- (aopalliance:aopalliance:jar:1.0:compile - omitted for duplicate)
[INFO] |  |  +- (org.springframework.security:spring-security-core:jar:3.2.6.RELEASE:compile - omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-context:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-expression:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  \- (org.springframework:spring-web:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  \- org.springframework:spring-aop:jar:4.1.5.RELEASE:compile
[INFO] |     +- (aopalliance:aopalliance:jar:1.0:compile - omitted for duplicate)
[INFO] |     +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |     \- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.2.2.RELEASE:compile
[INFO] |  +- (org.springframework.boot:spring-boot-starter:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.2.2.RELEASE:compile
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.0.20:compile
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.0.20:compile
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-logging-juli:jar:8.0.20:compile
[INFO] |  |  \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.0.20:compile
[INFO] |  |     \- (org.apache.tomcat.embed:tomcat-embed-core:jar:8.0.20:compile - omitted for duplicate)
[INFO] |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.4.5:compile
[INFO] |  |  +- (com.fasterxml.jackson.core:jackson-annotations:jar:2.4.5:compile - version managed from 2.4.0; omitted for duplicate)
[INFO] |  |  \- com.fasterxml.jackson.core:jackson-core:jar:2.4.5:compile
[INFO] |  +- org.hibernate:hibernate-validator:jar:5.1.3.Final:compile
[INFO] |  |  +- javax.validation:validation-api:jar:1.1.0.Final:compile
[INFO] |  |  +- org.jboss.logging:jboss-logging:jar:3.1.3.GA:compile
[INFO] |  |  \- com.fasterxml:classmate:jar:1.0.0:compile
[INFO] |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- (org.springframework:spring-web:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  \- org.springframework:spring-webmvc:jar:4.1.5.RELEASE:compile
[INFO] |     +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |     +- (org.springframework:spring-context:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |     +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |     +- (org.springframework:spring-expression:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |     \- (org.springframework:spring-web:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.2.2.RELEASE:compile
[INFO] |  +- (org.springframework.boot:spring-boot-starter:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- org.springframework:spring-jdbc:jar:4.1.5.RELEASE:compile
[INFO] |  |  +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  \- (org.springframework:spring-tx:jar:4.1.5.RELEASE:compile - omitted for duplicate)
[INFO] |  +- org.apache.tomcat:tomcat-jdbc:jar:8.0.20:compile
[INFO] |  |  \- org.apache.tomcat:tomcat-juli:jar:8.0.20:compile
[INFO] |  \- org.springframework:spring-tx:jar:4.1.5.RELEASE:compile
[INFO] |     +- (org.springframework:spring-beans:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |     \- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] +- org.springframework.boot:spring-boot-starter-aop:jar:1.2.2.RELEASE:compile
[INFO] |  +- (org.springframework.boot:spring-boot-starter:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  +- (org.springframework:spring-aop:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  +- org.aspectj:aspectjrt:jar:1.8.5:compile
[INFO] |  \- org.aspectj:aspectjweaver:jar:1.8.5:compile
[INFO] +- org.apache.commons:commons-lang3:jar:3.3.2:compile
[INFO] +- commons-beanutils:commons-beanutils:jar:1.9.2:compile
[INFO] |  \- commons-collections:commons-collections:jar:3.2.1:compile
[INFO] +- org.springframework.boot:spring-boot-starter-test:jar:1.2.2.RELEASE:test
[INFO] |  +- junit:junit:jar:4.12:test
[INFO] |  |  \- (org.hamcrest:hamcrest-core:jar:1.3:test - version managed from 1.1; omitted for duplicate)
[INFO] |  +- org.mockito:mockito-core:jar:1.10.19:test
[INFO] |  |  +- (org.hamcrest:hamcrest-core:jar:1.3:test - version managed from 1.1; omitted for duplicate)
[INFO] |  |  \- org.objenesis:objenesis:jar:2.1:test
[INFO] |  +- org.hamcrest:hamcrest-core:jar:1.3:test
[INFO] |  +- org.hamcrest:hamcrest-library:jar:1.3:test
[INFO] |  |  \- (org.hamcrest:hamcrest-core:jar:1.3:test - version managed from 1.1; omitted for duplicate)
[INFO] |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:test - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  \- org.springframework:spring-test:jar:4.1.5.RELEASE:test
[INFO] |     \- (org.springframework:spring-core:jar:4.1.5.RELEASE:test - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] +- org.springframework.boot:spring-boot-starter-actuator:jar:1.2.2.RELEASE:compile
[INFO] |  +- (org.springframework.boot:spring-boot-starter:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  +- org.springframework.boot:spring-boot-actuator:jar:1.2.2.RELEASE:compile
[INFO] |  |  +- (org.springframework.boot:spring-boot:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  |  +- (org.springframework.boot:spring-boot-autoconfigure:jar:1.2.2.RELEASE:compile - omitted for duplicate)
[INFO] |  |  +- (com.fasterxml.jackson.core:jackson-databind:jar:2.4.5:compile - omitted for duplicate)
[INFO] |  |  +- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  |  \- (org.springframework:spring-context:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] |  \- (org.springframework:spring-core:jar:4.1.5.RELEASE:compile - version managed from 3.2.8.RELEASE; omitted for duplicate)
[INFO] +- org.flywaydb:flyway-core:jar:3.1:compile
[INFO] +- org.mockito:mockito-all:jar:1.10.19:compile
[INFO] +- com.h2database:h2:jar:1.4.185:compile
[INFO] +- mysql:mysql-connector-java:jar:5.1.34:compile
[INFO] +- org.codehaus.janino:janino:jar:2.6.1:compile
[INFO] |  \- org.codehaus.janino:commons-compiler:jar:2.6.1:compile
[INFO] +- org.apache.poi:poi:jar:3.10-FINAL:compile
[INFO] |  \- commons-codec:commons-codec:jar:1.5:compile
[INFO] +- org.apache.poi:poi-ooxml:jar:3.10-FINAL:compile
[INFO] |  +- (org.apache.poi:poi:jar:3.10-FINAL:compile - omitted for duplicate)
[INFO] |  +- org.apache.poi:poi-ooxml-schemas:jar:3.10-FINAL:compile
[INFO] |  |  \- org.apache.xmlbeans:xmlbeans:jar:2.3.0:compile
[INFO] |  |     \- stax:stax-api:jar:1.0.1:compile
[INFO] |  \- dom4j:dom4j:jar:1.6.1:compile
[INFO] |     \- xml-apis:xml-apis:jar:1.0.b2:compile
[INFO] \- org.scala-lang:scala-library:jar:2.10.4:compile

A:

Pls try this :-
a) Change 
 @Autowired
    private UserDetailsService userDetailsService;

To
@Autowired
    private UserServiceBean userDetailsService;

b) Use @Service here 
@Service
public class UserServiceBean implements UserService {

c) Change @AuthenticationPrincipal User user to @AuthenticationPrincipal UserDetails userDetails

A:

The type in the controller needs to match with the type that you return from the UserDetailsService.
The Javadoc explicitly states: 

If the types do not match, null will be returned unless
  AuthenticationPrincipal.errorOnInvalidType() is true in which case a
  ClassCastException will be thrown.

Pretty strange that the error is not the default.

