Unexpected NullPointerException When Accessing Nested Objects in Java 11 with Optional
I'm writing unit tests and I'm having trouble with I need some guidance on I'm working with a `NullPointerException` when trying to access nested properties of an object using Java 11's `Optional` class. The scenario arises when I have a chain of method calls that unwraps the `Optional`. Here's a simplified version of my code: ```java import java.util.Optional; class Address { private String street; public Address(String street) { this.street = street; } public String getStreet() { return street; } } class User { private Optional<Address> address; public User(Optional<Address> address) { this.address = address; } public Optional<Address> getAddress() { return address; } } public class Main { public static void main(String[] args) { User user = new User(Optional.empty()); // Simulating no address String street = user.getAddress() .map(Address::getStreet) .orElseThrow(() -> new NullPointerException("Street not found")); System.out.println(street); } } ``` In this example, I expect to get a `NullPointerException` with a custom message if the address is not present. However, I get an unexpected `java.lang.NullPointerException` pointing to the `getStreet()` method call instead. It looks like the `Optional` handling isn't working as I thought it would. I've tried wrapping the `getStreet()` call in an additional `Optional.ofNullable()` but that only seems to mask the question rather than address it. I'm unsure why the `NullPointerException` is happening when the `Optional` is empty. Any insights into what's going wrong here? Is there a better way to handle this scenario using `Optional`? Additionally, are there any best practices I should follow to avoid such issues in the future? For context: I'm using Java on Linux. I'm working on a mobile app that needs to handle this. What's the correct way to implement this? This is part of a larger web app I'm building. Is this even possible? For reference, this is a production REST API. I appreciate any insights!