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Jakub Zych bcf928da77 docs(01-01): complete Mill Build and ZIO HTTP Server plan

Tasks completed: 3/3
- Create Mill build configuration
- Create project structure and configuration
- Create HTTP routes and Main entry point

SUMMARY: .planning/phases/01-foundation/01-01-SUMMARY.md

2026-02-04 21:45:03 +01:00

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Phase 01 Plan 01: Mill Build and ZIO HTTP Server Summary

Mill 1.1.1 build with Scala 3.3.4, ZIO HTTP server on port 8080, HOCON configuration with environment overrides

Performance

Duration: 39 min
Started: 2026-02-04T20:04:29Z
Completed: 2026-02-04T20:44:00Z
Tasks: 3
Files created: 8

Accomplishments

Mill build system configured with all ZIO dependencies for Phase 1
Working HTTP server with /health endpoint returning "ok"
Configuration infrastructure using zio-config-magnolia for automatic derivation
ASCII sun banner displayed on server startup

Task Commits

Each task was committed atomically:

Task 1: Create Mill build configuration - aedb45f (feat)
Task 2: Create project structure and configuration - 4278b84 (feat)
Task 3: Create HTTP routes and Main entry point - 3757cf8 (feat)

Files Created

build.mill - Mill build configuration with Scala 3.3.4 and ZIO dependencies
.mill-version - Pins Mill version to 1.1.1
.gitignore - Excludes Mill artifacts, IDE files, OS files
summercms/src/Main.scala - ZIOAppDefault entry point with banner
summercms/src/api/Routes.scala - Route composition point
summercms/src/api/HealthRoutes.scala - GET /health endpoint
summercms/src/config/AppConfig.scala - ServerConfig, DatabaseConfig, AppConfig case classes
summercms/resources/application.conf - HOCON config with env overrides

Decisions Made

Mill 1.1.1 instead of 0.12.x - System Java 25 (class file version 69) requires newer Mill with updated ASM library
mvnDeps instead of ivyDeps - Mill 1.x renamed the dependency method
root.config import - Avoids shadowing from zio.* importing zio.config

Deviations from Plan

Auto-fixed Issues

1. [Rule 3 - Blocking] Updated Mill version for Java 25 compatibility

Found during: Task 1
Issue: Mill 0.12.11 ASM library doesn't support Java 25 class file version 69
Fix: Downloaded Mill 1.1.1 launcher, updated .mill-version
Files modified: .mill-version, downloaded ./mill launcher
Verification: ./mill resolve _ succeeds
Committed in: aedb45f

2. [Rule 3 - Blocking] Added .gitignore for Mill artifacts

Found during: Task 1
Issue: Build artifacts (out/, mill executable) would be committed without gitignore
Fix: Created .gitignore excluding Mill artifacts, IDE files, OS files
Files modified: .gitignore (new file)
Verification: git status --short no longer shows out/ or mill
Committed in: aedb45f

3. [Rule 1 - Bug] Fixed import shadowing with zio.config

Found during: Task 3
Issue: import zio.* brings zio.config into scope, shadowing local config package
Fix: Used _root_.config.{AppConfig as SummerConfig} import
Files modified: summercms/src/Main.scala
Verification: ./mill summercms.compile succeeds
Committed in: 3757cf8

Total deviations: 3 auto-fixed (2 blocking, 1 bug) Impact on plan: All auto-fixes necessary for correctness. No scope creep.

Issues Encountered

SLF4J warning about missing StaticLoggerBinder - benign, zio-http works with NOP logger. Will be resolved when adding proper logging in later phases.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

Build system ready for database integration (Plan 01-02)
All ZIO dependencies already declared for database layer
Configuration pattern established for adding more settings
Ready to add /ready endpoint once database is connected

Phase: 01-foundation Completed: 2026-02-04

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