SEC-1431: Modify OpenID sample to use a custom UserDetailsService which allows any user to authenticate, allocating them a standard role and "registers" their ID in a map, allowing it to be retrieved in subsequent logins.

web/src/main/java/org/springframework/security/web/authentication/preauth/AbstractPreAuthenticatedProcessingFilter.java

@@ -204,6 +204,13 @@ public abstract class AbstractPreAuthenticatedProcessingFilter extends GenericFi
         this.authenticationManager = authenticationManager;
     }
 
+    /**
+     * If set to {@code true}, any {@code AuthenticationException} raised by the {@code AuthenticationManager} will be
+     * swallowed, and the request will be allowed to proceed, potentially using alternative authentication mechanisms.
+     * If {@code false} (the default), authentication failure will result in an immediate exception.
+     *
+     * @param shouldContinue set to {@code true} to allow the request to proceed after a failed authentication.
+     */
     public void setContinueFilterChainOnUnsuccessfulAuthentication(boolean shouldContinue) {
         continueFilterChainOnUnsuccessfulAuthentication = shouldContinue;
     }