Migrate Spring Boot application from Java 11 to Java 17

[devin-ai-integration]

Migrate Spring Boot application from Java 11 to Java 17

Summary

This PR migrates the RealWorld Spring Boot application from Java 11 to Java 17, including upgrading Spring Boot from 2.6.3 to 3.1.5 and all related dependencies.

Key changes:

• Java version: 11 → 17
• Spring Boot: 2.6.3 → 3.1.5
• Gradle: 7.4 → 8.4
• MyBatis: 2.2.2 → 3.0.3
• Netflix DGS: 4.9.21 → 8.1.1
• Jakarta EE namespace migration (javax.* → jakarta.*)
• Spring Security 6 refactoring (removed WebSecurityConfigurerAdapter, using SecurityFilterChain bean)
• GraphQL PageInfo type conversion updated for DGS 8.x compatibility

Review & Testing Checklist for Human

• Security configuration: Verify the refactored WebSecurityConfig.java maintains the same authorization rules - the migration from antMatchers to requestMatchers and the new lambda-based configuration style could have subtle differences
• GraphQL pagination: The PageInfo type was changed from graphql.relay.DefaultPageInfo to io.spring.graphql.types.PageInfo in both ArticleDatafetcher and CommentDatafetcher - test GraphQL queries with pagination (first/after, last/before)
• REST API endpoints: Test key endpoints manually:
  • POST /users and POST /users/login (authentication)
  • GET /articles and GET /articles/feed (authorization rules)
  • POST /articles (validation with Jakarta)
• Exception handling: The CustomizeExceptionHandler.handleMethodArgumentNotValid signature changed from HttpStatus to HttpStatusCode - verify validation errors return proper 422 responses

Recommended test plan:

1. Run ./gradlew bootRun and verify app starts on http://localhost:8080
2. Test REST API: curl http://localhost:8080/tags
3. Test GraphQL: Access http://localhost:8080/graphiql and run a query with pagination
4. Test authentication flow end-to-end

Notes

All 68 existing tests pass locally with Java 17. The core business logic, domain entities, and database schema remain unchanged.

Link to Devin run: https://app.devin.ai/sessions/c10f6a129af1420e921722b51f1f2100
Requested by: @SachetCognition

[devin-ai-integration]

Original prompt from sachet.agarwal

# Migrate Spring Boot RealWorld Application from Java 11 to Java 17

## Repository
`SachetCognition/spring-boot-realworld-example-app`

## Background
This is a Spring Boot 2.6.3 application currently running on Java 11 that implements a RealWorld social blogging platform with both REST and GraphQL APIs. The application uses:
- Spring Boot 2.6.3
- MyBatis 2.2.2 for data access
- Netflix DGS Framework 4.9.21 for GraphQL
- JWT for authentication
- SQLite database
- Flyway for migrations
- Gradle as the build system

The application follows Domain-Driven Design (DDD) principles with a layered architecture and implements CQRS pattern.

## Task
Migrate the application from Java 11 to Java 17 while preserving all business and technical functionalities.

## Required Changes

### 1. Update Java Version in `build.gradle`
Locate lines 10-11 in `build.gradle` and update:
```gradle
sourceCompatibility = '17'
targetCompatibility = '17'

2. Upgrade Spring Boot Version in build.gradle

Locate lines 2-3 in build.gradle and update to Spring Boot 3.x series (which supports Java 17):

id 'org.springframework.boot' version '3.1.5'
id 'io.spring.dependency-management' version '1.1.3'

3. Update Dependencies in build.gradle

Update the following dependencies to be compatible with Spring Boot 3 and Java 17:

• MyBatis Spring Boot Starter: Upgrade to version 3.0.3 (currently at 2.2.2 on line 38)
• Netflix DGS Framework: Upgrade to latest compatible version (currently at 4.9.21 on line 39)
• Update all testing dependencies for Spring Boot 3 compatibility

4. Jakarta EE Namespace Migration

Spring Boot 3 uses Jakarta EE instead of javax. Search the entire codebase and update all imports:

• javax.servlet → jakarta.servlet
• javax.validation → jakarta.validation
• javax.persistence → jakarta.persistence

5. Update Security Configuration in src/main/java/io/spring/api/security/WebSecurityConfig.java

The WebSecurityConfigurerAdapter is deprecated... (1964 chars truncated...)

</details>

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