👀 Views: 96 💬 Answers: 1 📅 Created: 2025-06-06

spring-boot optional nullpointerexception jpa Java

I'm working with a `NullPointerException` in my Spring Boot application while trying to handle an `Optional` value from a repository call. My service method is supposed to return a user by ID, but occasionally it throws an exception when I try to access the `User` object. Here’s the code snippet of the service method: ```java @Service public class UserService { @Autowired private UserRepository userRepository; public User getUserById(Long id) { return userRepository.findById(id) .orElseThrow(() -> new NoSuchElementException("User not found")); } } ``` The `findById` method is defined in my repository as follows: ```java public interface UserRepository extends JpaRepository<User, Long> { Optional<User> findById(Long id); } ``` When I call `getUserById` with a valid ID, it works as expected, but sometimes when the ID does not exist, I get a `NullPointerException` instead of the `NoSuchElementException`. I've double-checked that the repository is correctly autowired, and I also enabled JPA logging. The logs show that the SQL query is executed as expected, returning no results. I’m unsure why it behaves this way. Could it be that there’s some concurrency scenario with my repository, or am I missing something in the way I'm handling the `Optional`? I’ve been trying to debug this by adding breakpoints and logging, but the scenario seems intermittent. Any insights would be greatly appreciated! This is part of a larger application I'm building. I'd really appreciate any guidance on this.