A DESCRIPTION OF THE REQUEST :
As java doesn't has references (only pointers), the most common errors I've seen so far is NullPointerException. So the suggestion is simple either to have reference types like "String& " or keyword notnull..

so I can write either:

public void doSomething(String& s) { }

or

public void doSomething(notnull String s){}

and be sure that nobody will pass me a null pointer. The first syntax is more regular and natural, while the second is more java like :)


JUSTIFICATION :
It will make code maintenance easier, and make NullPointerException really exceptional rather than regular.
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