9 Things about null keyword and reference in Java

Java and null are uniquely bonded. There is hardly a Java programmer, who is not troubled by the null pointer exception, it is the most infamous fact about. Even the inventor of the null concept has called it his billion-dollar mistake, then why Java kept it? Null was there from a long time and I believe the Java designer knows that null creates more problems than it solves, but still they went with it. It surprises me even more because Java's design philosophy was to simplify things, that's why they didn't bother with pointers, operator overloading, and multiple inheritance of implementation, they why null? 

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