IllegalAccessException,
          InvocationTargetException,
          FactoryMethodReturnsNullException {
    if (!Modifier.isAbstract(cls.getModifiers())) {
      nullPointerTester.testConstructors(cls, visibility);
    }
    nullPointerTester.testStaticMethods(cls, visibility);
    if (hasInstanceMethodToTestNulls(cls, visibility)) {
      Object instance = instantiate(cls);
      if (instance != null) {

          IllegalAccessException,
          InvocationTargetException,
          FactoryMethodReturnsNullException {
    if (!Modifier.isAbstract(cls.getModifiers())) {
      nullPointerTester.testConstructors(cls, visibility);
    }
    nullPointerTester.testStaticMethods(cls, visibility);
    if (hasInstanceMethodToTestNulls(cls, visibility)) {
      Object instance = instantiate(cls);
      if (instance != null) {

  public void testPrivateClass() {
    NullPointerTester tester = new NullPointerTester();
    for (Constructor<?> constructor :
        PrivateClassWithPrivateConstructor.class.getDeclaredConstructors()) {
      tester.testConstructor(constructor);
    }
  }

  private interface Foo<T> {
    void doSomething(T bar, Integer baz);
  }

  private static class StringFoo implements Foo<String> {

    @Override