SEC-1210: RememberMe filter misses UserDetailsService in default <http /> tag config when it is declared in parent app context. Fixed by getting the UserDetailsServiceInjectionPostProcessor to check ancestor bean factories for a UserDetailsService if one isn't found in the current bean factory.

config/src/test/java/org/springframework/security/config/http/HttpSecurityBeanDefinitionParserTests.java

@@ -938,6 +938,16 @@ public class HttpSecurityBeanDefinitionParserTests {
         assertEquals(Boolean.TRUE, FieldUtils.getFieldValue(filter, "repo.disableUrlRewriting"));
     }
 
+    @Test
+    public void userDetailsServiceInParentContextIsLocatedSuccessfully() throws Exception {
+        appContext = new InMemoryXmlApplicationContext(AUTH_PROVIDER_XML);
+
+        appContext = new InMemoryXmlApplicationContext(
+                "<http auto-config='true'>" +
+                "    <remember-me />" +
+                "</http>", appContext);
+    }
+
     private void setContext(String context) {
         appContext = new InMemoryXmlApplicationContext(context);
     }