One of the major pain points with using Java and a number of other languages has to do with accessing a null reference. This can result in your application crashing without showing the user an adequate error message. If you're a Java developer, I'm pretty sure you're well acquainted with the almighty NullPointerException. One of the most amazing things about Kotlin is null safety. 

With Kotlin, a NullPointerException can only be caused by one of the following:

• An external Java code
• An explicit call to throw the NullPointerException
• Usage of the !! operator (we'll learn more about this operator later)
• Data inconsistency regarding initialization

How cool is that?