Keywrapper fix

KeyWrapper in Hive is the package scope access restriction, which prevents the access from the object instances created by different classloader, even the caller has the same package name with KeyWrapper. 

The links may help in understanding.
https://access.redhat.com/site/documentation/en-US/JBoss_Enterprise_Application_Platform/4.3/html/Server_Configuration_Guide/Class_Loading_and_Types_in_Java-IllegalAccessException___Doing_what_you_should_not.html