Groovy safe navigation operator (?.) to avoid NullPointerException. 10+ examples covering chaining, collections, and real-world patterns. Tested on Groovy 5.x. “NullPointerException is the billion-dollar mistake of software engineering. The safe navigation operator is Groovy’s way of saying: never again.” Tony Hoare, Inventor of Null References Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Beginner to Intermediate | Reading Time: 15 minutes If you have spent any time writing Java, you know the pain of NullPointerException. ... Read More