@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter{

@Bean
    CustomAuthenticationProvider customAuthenticationProvider() {
        return new CustomAuthenticationProvider();
    }   
@Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(customAuthenticationProvider());
    }

@Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(new CustomAuthenticationProvider());
    }

<authentication-manager>
        <authentication-provider ref="myAuthenticationProvider" />
    </authentication-manager>
 
  <beans:bean id="userDetailsService" class="net.mantis.security.auth.NMUserDetailsService"/>
  <beans:bean id="myAuthenticationProvider" class="net.mantis.security.auth.MyAuthenticationProvider">
       <beans:property name="userDetailsService">
            <beans:bean class="net.mantis.security.auth.NMUserDetailsService">            
            </beans:bean>
        </beans:property>
  </beans:bean>

public class MyAuthenticationProvider implements AuthenticationProvider {
 
    UserDetailsService userDetailsService;
    public Authentication authenticate(Authentication authentication)
            throws AuthenticationException {
         //username
        System.out.println("user name: "+authentication.getName());
        //password
        System.out.println("password: "+authentication.getCredentials());
        System.out.println("getPrincipal: "+authentication.getPrincipal());
        System.out.println("getAuthorities: "+authentication.getAuthorities());
        System.out.println("getDetails: "+authentication.getDetails());
        UserDetails userDetails = (UserDetails)this.userDetailsService.loadUserByUsername(authentication.getName());
      
        UsernamePasswordAuthenticationToken result = new UsernamePasswordAuthenticationToken(
                userDetails, authentication.getCredentials(),userDetails.getAuthorities());
        return result;
    }
    public boolean supports(Class authentication) {
         return true;
    }
    public void setUserDetailsService(UserDetailsService userDetailsService){
        this.userDetailsService = userDetailsService;
    }
}

public class NMUserDetailsService implements UserDetailsService {
    @Override
    public UserDetails loadUserByUsername(String userName)
            throws UsernameNotFoundException {
        ArrayList list = new ArrayList();
        list.add(new SimpleGrantedAuthority("ROLE_SUPERVISOR"));
        User details = new User("rod", "koala", list);
        return details;
    }
}