Fix possible NullPointerException
Add missing package info files
Fix critical bug in equals method of NodeTokenizer
Fix hashCode method of NodeTypeDivider
Fix possible NullPointerException in JavaElements helpers
Add missing Nullable annotation in NodeClassFilter
Add missing null check in NodeTransformers internals
Use platform independent string formatting in examples
Fix double-checked locking in AbstractAnnotableRegistration
Fix double-checked locking in MatchingNode
Use StringBuilder when building UI error messages
Lock inheritance of MainPreferencePage
Fix incorrect cast in list helpers
Fix an infinite recursive loop in DelegatedAnnotable
Add missing Nullable annotations to AbstractAccessor
Use serialization proxies in enum constant supports
Add missing Nullable annotation to NodeTypeDivider
Fix possible NullPointerException in AST helpers
Fix possible NullPointerException in equals method of InternalFilter
Fix possible NullPointerException in IdeActivityPreferencePage