- Throw a lang.IllegalAccessException from null`s constructor to ensure it can   only be instantiated once - Make sure NULLs and non-objects cannot be cloned
- Throw a lang.IllegalAccessException from null`s constructor to ensure it can
  only be instantiated once
- Make sure NULLs and non-objects cannot be cloned

git-svn-id: 526f3b90ad6d9b1dfe840af828070ca3d99521ac@6254 d2cacbed-c0f6-0310-851a-9dad52fc623a

johannes85/core