Why do people still use primitive types in Java?

Question

Since Java 5, we\'ve had boxing/unboxing of primitive types so that int is wrapped to be java.lang.Integer, and so and and so forth.

I see

Answer 1

Autounboxing can lead to hard to spot NPEs

Integer in = null;
...
...
int i = in; // NPE at runtime

In most situations the null assignment to in is a lot less obvious than above.