Review

Checks that an object is null before calling a method on it.

Check for not null instead of null.

• missing/condition/null_check
• superfluous/condition/null_check

mubench/examples/directives/MayBeNull.java

misuse(Object)

class MayBeNull {
	public void misuse(Object maybeNull) {
    if (maybeNull == null) {
      maybeNull.hashCode();
    }
	}

}

public class CheckNotNull {
	public void pattern(Object maybeNull) {
    if (maybeNull != null) {
      maybeNull.hashCode();
    }
	}
}