Using multiple WebSecurityConfigurerAdapter with different AuthenticationProviders (basic auth for API and LDAP for web app)
<p>According the <a href="http://docs.spring.io/spring-security/site/docs/current/reference/html/jc.html" rel="noreferrer">Spring Security Reference section 5.7</a> it should be possible to define more than one security adapter.</p>

<p>I try to do the same but without success. After a server reboot, the first x times the API works fine with basic auth, but after a couple of times I'm redirected to the login (form) page, this should only happen for our web app, not for the API calls.</p>

<p>My code:</p>

<pre class="lang-java prettyprint-override"><code>@EnableWebSecurity
public class MultiHttpSecurityConfig  {

    @Configuration
    @Order(1)
    public static class ApiWebSecurityConfigurationAdapter extends WebSecurityConfigurerAdapter {

        @Autowired
        private Environment env;

        @Autowired
        public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
            auth.inMemoryAuthentication().
                withUser("admin").password("pw_test").roles(API_ROLE);
        }

        protected void configure(HttpSecurity http) throws Exception {
            http
              .antMatcher("/services/**")
              .authorizeRequests()
              .anyRequest().hasRole(API_ROLE)
              .and()
              .httpBasic()
              .and()
              .csrf()
              .disable();
        }
    }

    @Configuration
    @Order(2)
    public static class FormLoginWebSecurityConfigurerAdapter extends WebSecurityConfigurerAdapter {

        @Autowired
        private Environment env;

        @Autowired
        public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
            auth.authenticationProvider(activeDirectoryLdapAuthenticationProvider());
            auth.eraseCredentials(false);
        }

        @Override
        protected void configure(HttpSecurity http) throws Exception {
            // LDAP FORM AUTHENTICATION
            http.authorizeRequests()
                .antMatchers("/login.html").permitAll()
                .antMatchers("/css/**").permitAll() 
                .antMatchers("/js/**").permitAll() 
                .antMatchers("/images/**").permitAll() 
                .anyRequest().authenticated()
            .and().formLogin()
                .failureUrl("/login.html?error=1")
                .loginPage("/login.html")
                .loginProcessingUrl("/j_spring_security_check")
                .defaultSuccessUrl("/success.html")
                .usernameParameter("j_username")
                .passwordParameter("j_password")
                .permitAll();

            http.csrf().disable();

            // iFRAMES SETTINGS
            http
                .headers()
                .frameOptions().sameOrigin()
                .httpStrictTransportSecurity().disable();

            // HTTPS
            http
                .requiresChannel()
                .anyRequest()
                .requiresSecure();

            //MAP 8080 to HTTPS PORT
            http.portMapper().http(8080).mapsTo(443);
        }

        @Bean
        public AuthenticationProvider activeDirectoryLdapAuthenticationProvider() {
            CustomLdapAuthenticationProvider provider = new CustomLdapAuthenticationProvider(env.getProperty("ldap.domain"), env.getProperty("ldap.url"), env.getProperty("ldap.base"));
            provider.setConvertSubErrorCodesToExceptions(true);
            provider.setUseAuthenticationRequestCredentials(true);
            return provider;
        }
    }
}
</code></pre>

<p>Any idea?</p>

<p>I'm using Spring Boot version 1.4.1-RELEASE and Spring Security version 4.1.3-RELEASE.</p>