Migrate eShopLegacyMVC from .NET Framework 4.7.2 to Java 21 / Spring Boot 3.5

[devin-ai-integration]

Summary

Complete migration of the eShopLegacyMVC catalog application from ASP.NET MVC (.NET Framework 4.7.2) to Java 21 / Spring Boot 3.5.0, as planned on the .NET Migration Jira board (Epics NM-13 through NM-21, Stories NM-22 through NM-50).

What changed

A new Spring Boot project at eShopLegacyMVCSolution/src/eShopLegacyMVC-SpringBoot/ implementing the full catalog application:

Epic	Scope	Key Files
0 - Scaffold	Maven project, config, logging, static assets	pom.xml, application*.yml, logback-spring.xml
1 - Entities	CatalogItem, CatalogBrand, CatalogType JPA entities	model/*.java
2 - Data Access	Spring Data JPA repos, Flyway migrations, HiLo generator	repository/*.java, db/migration/*.sql
3 - Services	ICatalogService + real/mock implementations	service/*.java, config/CatalogConfig.java
4 - Shared Lib	Jackson serialization replacing BinaryFormatter	util/Serializing.java, dto/BrandDTO.java
5 - Controllers	CatalogController, PicController, REST APIs + Thymeleaf views	controller/*.java, templates/**/*.html
6 - Cross-cutting	Request logging filter, session listener, security config, error handling, Actuator observability	config/*.java
7 - Testing	36 tests: unit (service layer), controller (MockMvc), API contract, serialization	src/test/**/*.java
8 - Deployment	Multi-stage Dockerfile, README, RUNBOOK.md	Dockerfile, README.md, RUNBOOK.md

Technology mapping

.NET	Java/Spring
ASP.NET MVC 5	Spring MVC + Thymeleaf
Entity Framework 6	Spring Data JPA + Hibernate
Autofac DI	Spring IoC + @Profile/@ConditionalOnProperty
log4net	SLF4J + Logback
BinaryFormatter	Jackson ObjectMapper
Application Insights	Spring Boot Actuator + Micrometer
SQL Server (same DB)	Same SQL Server via mssql-jdbc + Flyway

Orchestration

This migration was executed via parallel child Devin sessions in 3 waves:

• Wave 1 (parallel): Epics 1-3, Epic 4, Story 6.3
• Wave 2 (parallel): Stories 5.1-5.3, Stories 5.4-5.5
• Wave 3 (parallel): Epics 6.1+6.2, Epic 7, Epic 8

Review & Testing Checklist for Human

• Run with mock profile — cd eShopLegacyMVCSolution/src/eShopLegacyMVC-SpringBoot && mvn spring-boot:run -Dspring-boot.run.profiles=mock → verify catalog UI at http://localhost:8080/catalog shows 12 products with pagination
• Verify CRUD operations — Create, edit, detail, delete flows on the catalog UI work correctly with mock data
• Verify REST APIs — curl http://localhost:8080/api/brands returns 5 brands JSON; curl http://localhost:8080/api/files returns BrandDTOs
• Verify actuator — curl http://localhost:8080/actuator/health returns UP with catalog service details
• Run with SQL Server — If SQL Server is available, test with dev profile to verify Flyway migrations and real data access layer

Test plan

1. mvn clean compile — verify build (Java 21 required)
2. mvn test — verify all 36 tests pass
3. mvn spring-boot:run -Dspring-boot.run.profiles=mock — test full UI flow
4. docker build -t eshop-catalog . && docker run -p 8080:8080 -e APP_USE_MOCK_DATA=true eshop-catalog — test Docker deployment

Notes

• The original .NET application is untouched — this is an additive migration
• The Spring Boot app targets the same SQL Server database schema, so it can be deployed alongside the .NET app for blue-green cutover (see RUNBOOK.md)
• All 36 tests pass (0 failures, 0 errors, 0 skipped)
• The mock profile allows running without a database by using in-memory data

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/12458d33f65e4683b5fda8ec391bc624

Requested by: @mbatchelor81

---

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring