}

  private static <T> T createInstance(Invokable<?, ? extends T> factory, List<?> args)
      throws FactoryMethodReturnsNullException, InvocationTargetException, IllegalAccessException {
    T instance = invoke(factory, args);
    if (instance == null) {
      throw new FactoryMethodReturnsNullException(factory);
    }
    return instance;
  }

  }

  private static <T> T createInstance(Invokable<?, ? extends T> factory, List<?> args)
      throws FactoryMethodReturnsNullException, InvocationTargetException, IllegalAccessException {
    T instance = invoke(factory, args);
    if (instance == null) {
      throw new FactoryMethodReturnsNullException(factory);
    }
    return instance;
  }

import com.google.common.base.Functions;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.common.testing.ClassSanityTester.FactoryMethodReturnsNullException;
import com.google.common.testing.ClassSanityTester.ParameterHasNoDistinctValueException;
import com.google.common.testing.ClassSanityTester.ParameterNotInstantiableException;