Spring Advanced

A backend service built with Spring Boot, designed to manage authentication, task operations, and user interactions.

Project Overview

This repository was initialized and debugged from a broken state. The application now runs successfully after resolving multiple critical issues across configuration, logic, and testing layers.

Completed Tasks

Level	Task Description
Lv 0	Fixed application startup errors and configuration issues
Lv 1	Restored and re-implemented AuthUserArgumentResolver
Lv 2	Refactored service logic for early returns, removed unnecessary else blocks, and moved password validation to DTO
Lv 3	Resolved N+1 query problem using @EntityGraph in TodoRepository
Lv 4	Corrected and improved test cases across multiple services

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Built With

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♻ Key Improvements

Error Resolution

• Fixed multiple startup errors including misconfigured beans and missing dependencies.
• Added application.yml with proper JWT key setup.

ArgumentResolver

• Re-implemented AuthUserArgumentResolver to correctly inject authenticated user context into controller methods.

Code Refactoring

• Early Return Logic: Prevented unnecessary password encoding by checking for duplicate emails first.
• Simplified Conditionals: Removed nested else blocks for better readability in WeatherClient.
• Validation Shift: Moved password validation logic from service layer to DTO using annotations like @Size, @Pattern and @NotBlank.

Performance Optimization

• Replaced JPQL fetch join with @EntityGraph to resolve N+1 query issues in TodoService.

Test Coverage

Fixed broken test cases:

• PassEncoderTest now correctly verifies password matching.
• ManagerServiceTest and CommentServiceTest updated to reflect correct exception handling.
• Renamed misleading test method names to match actual behavior.
• Adjusted service logic to ensure tests pass under updated conditions.