ADDITIONAL SYSTEM INFORMATION :
Windows 10 x64, Java 9.0.1, 9.0.4, 10.0.1

A DESCRIPTION OF THE PROBLEM :
When the attached code is compiled with target 8 with JDK 9.0.1+ or JDK 10.0.4+, the compiler places an Objects.requireNonNull call when instantiating an inner class off of a parent class.

This causes tools such as AnimalSniffer to report an error on the instantiation when the API usage should be limited to Java 6 only. When compiling with target 6, target 9 or target 10, there is no such call generated. Similarly, when compiling with Java 8u151 and target 8, there is no such call.

I don't know if Java 11 does this too because currently the tools I'm using don't run on it yet.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the attached example program with Java 9 target 8. Inspect the generated class file for Objects.requireNonNull

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No calls to Objects.requiredNonNull
ACTUAL -
Call to Objects.requiredNonNull generated in the class file

---------- BEGIN SOURCE ----------
public class ObjNullCheck {
    static class A {
        class B {

        }
    }

    public static void main(String[] args) {
        A a = new A();

        A.B b = a.new B();

        System.out.println(b);
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Do not use parentInstance.new InnerClass() but have a method on the parent class create an inner instance.

FREQUENCY : always