Hard-code location of the login endpoint for HBP

src/main/java/eu/hbp/mip/configuration/SecurityConfiguration.java

@@ -56,6 +56,8 @@ import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 import java.security.Principal;
 
+// See https://spring.io/guides/tutorials/spring-boot-oauth2/ for reference about configuring OAuth2 login
+
 /**
  * Configuration for security.
  */
@@ -124,7 +126,7 @@ public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
     }
 
     private Filter ssoFilter() {
-        OAuth2ClientAuthenticationProcessingFilter hbpFilter = new OAuth2ClientAuthenticationProcessingFilter(loginUrl);
+        OAuth2ClientAuthenticationProcessingFilter hbpFilter = new OAuth2ClientAuthenticationProcessingFilter("/login/hbp");
         OAuth2RestTemplate hbpTemplate = new OAuth2RestTemplate(hbp(), oauth2ClientContext);
         hbpFilter.setAuthenticationSuccessHandler(new SimpleUrlAuthenticationSuccessHandler(frontendRedirectAfterLogin));
         hbpFilter.setRestTemplate(hbpTemplate);