The full stack, explained the way you actually learn it.

Code first. Theory only where it pays for itself.

Most framework documentation answers “what can this do?”. Developers actually need “what should I do, and what will bite me?”. Every BitSnippets chapter follows the same shape:

1. The problemWhy the feature exists and what it replaces.
2. The smallest working exampleComplete, copy-pasteable, no hidden setup.
3. The real-world versionError handling, edge cases, configuration.
4. The pitfallsWhat breaks in production and how to spot it early.

@Service
public class UserService {

    private final UserMapper userMapper;

    public UserService(UserMapper userMapper) {
        this.userMapper = userMapper;
    }

    @Transactional(readOnly = true)
    public List<User> search(UserQuery query) {
        // Dynamic SQL is built in the mapper — the service
        // stays free of string concatenation.
        return userMapper.search(query);
    }

    @Transactional
    public void deactivate(Long id) {
        int updated = userMapper.setActive(id, false);
        if (updated == 0) {
            throw new UserNotFoundException(id);
        }
    }
}

Snippets are complete enough to compile. Every one has a copy button.