can't reach /oauth/token spring security for rest api

I was following a few examples for securing REST api with spring security (via configuration not XML). I have the following classes:

@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserManager userManager;

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

    @Override
    protected void configure(HttpSecurity http) throws Exception {
http.authorizeRequests().antMatchers("/**").authenticated().and().httpBasic().realmName("OAuth Server");
    }
}

@Configuration
@EnableAuthorizationServer
public class OAuthConfiguration extends AuthorizationServerConfigurerAdapter {

    @Autowired
    private DataSource dataSource;

    @Bean
    public TokenStore tokenStore() {
        return new JdbcTokenStore(dataSource);
    }

    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints.tokenStore(tokenStore());
    }

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.jdbc(dataSource);
    }
}

and of course my UserManager extends UserDetailsService

when I try to make a call to retrieve a user for a signed up user,

GET http://localhost:8080/oauth/token?grant_type=password&username=be@gmail.com&password=123

I get: 404 - page not found.

What is wrong?