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Can we invoke a static method on a null object reference in Java?

Yes. The compiler optimizes the code to invoke the static method using null object reference since object instance is not required to invoke a static method. 

public class StaticMethodUsingNull {

	static void printWelcomeMessage() {
		System.out.println("Welcome to javapedia.net!");
	}

	public static void main(String[] args) {
		StaticMethodUsingNull myRef = null;
		myRef.printWelcomeMessage(); /*Message will be printed sucessfully*/

	}

}

In case of calling a non-static (instance) method using null object reference, it will throw NullPointerException.

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