Verify Spring Boot 2.2 to 2.3 migration implementation completeness

[Copilot]

Reviewed the Spring Boot 2.2 to 2.3 migration tool implementation against the comprehensive specification in docs/spring_boot_2.2_to_2.3_migration.md to verify completeness and correctness.

Verification Results

✅ All P0-P1 features implemented correctly:

• Validation starter detection (CRITICAL) - Scans for @Valid, @Validated, constraint annotations; auto-adds spring-boot-starter-validation when needed
• POM migration - Updates to 2.3.12.RELEASE; validates Spring Cloud compatibility (Hoxton.SR8+); detects Cassandra/Elasticsearch breaking changes
• Property transformations - spring.http.encoding.* → server.servlet.encoding.*; spring.http.converters.* → spring.mvc.converters.*
• H2 console configuration - Auto-adds spring.datasource.generate-unique-name=false when H2 console enabled
• Data layer detection - Cassandra driver v4 and Elasticsearch REST client migrations flagged with guide generation

Architecture strengths:

• Refactored using abstract base classes (AbstractSpringBootMigrator, AbstractPomMigrator, AbstractPropertyFileMigrator) for code reuse
• Phase-based migration with proper ordering and error handling
• Comprehensive test coverage for all major components

P3 optional features (layered JARs, graceful shutdown, health probes) correctly marked as TODO per specification - these are enhancements, not requirements.

Example Usage

// Detect validation usage and auto-add starter
SpringBoot22to23Migrator migrator = new SpringBoot22to23Migrator(false);
MigrationResult result = migrator.migrateAll();
migrator.printReport();

The implementation fully addresses the most critical 2.3 breaking change: validation starter no longer included by default.

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