Polish SecurityJacksonModules

Issue gh-3736
* ClassLoader argument - this is required because we do not want to assume
the ClassLoader that should be used
* Clean up logging - logging is now at debug level because we don't expect
all of the modules are loaded (they are quite possibly off the ClassPath)
* Remove ObjectUtils as it was being used on methods that expect a
Collection or Array with non collection based objects
* Polish Javadoc warnings

cas/src/test/java/org/springframework/security/cas/jackson2/CasAuthenticationTokenMixinTests.java

@@ -71,8 +71,9 @@ public class CasAuthenticationTokenMixinTests {
 	}
 
 	ObjectMapper buildObjectMapper() {
+		ClassLoader loader = getClass().getClassLoader();
 		ObjectMapper mapper = new ObjectMapper();
-		mapper.registerModules(SecurityJacksonModules.getModules());
+		mapper.registerModules(SecurityJacksonModules.getModules(loader));
 		return mapper;
 	}