Reflection: How to access private method in private inner class that is in different package than caller class

I am having trouble in accessing private method in private inner class that resides in different package than caller class:

package reflectiontest.sompackage;

import reflectiontest.Interface;

public class Outer {
    private class Inner implements Interface {
        public int get() {
            return 4;
        }
    }

    public Interface getInner() {
        return new Inner();
    }
}

package reflectiontest;

public interface Interface {
    int get();
}

package reflectiontest;

import reflectiontest.sompackage.Outer;

import java.lang.reflect.Method;

public class Main {

    public static void main(String[] args) throws Exception {

        Outer outer = new Outer();
        Interface inner = outer.getInner();

        System.out.println(inner.get());

        Method get = inner.getClass().getMethod("get");
        System.out.println(get.invoke(inner));

    }

}

Log after running:

4
Exception in thread "main" java.lang.IllegalAccessException: class reflectiontest.Main cannot access a member of class reflectiontest.sompackage.Outer$Inner with modifiers "public"
    at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:394)
    at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:709)
    at java.base/java.lang.reflect.Method.invoke(Method.java:569)
    at reflectiontest.Main.main(Main.java:17)

During debugging i got to the point in Reflection.verifyMemberAccess() fails at this point:

        if (!Modifier.isPublic(getClassAccessFlags(memberClass))) {
            isSameClassPackage = isSameClassPackage(currentClass, memberClass);
            gotIsSameClassPackage = true;
            if (!isSameClassPackage) {
                return false;
            }
        }

The one option is to create a simple caller class inside the same package as Inner, but this seems a workaround.

Any other ideas on how to get it to work?