Claim Track 2: L0 Types & Codegen

[MichielBugherJelli]

Track Claim

Track: Track 2 — L0 types & codegen (codegen)

Prior JVM experience: Extensive experience with Java 21 records, sealed types, Jackson polymorphic serialization (@JsonTypeInfo/@JsonSubTypes), JavaPoet code generation, Gradle plugin development, and JSON Schema validation.

Availability: Full-time contributor

First milestone commitment: Complete codegen implementation generating all 492 AdCP schemas into 1161 Java files with sealed interfaces, discriminated unions, builders, runtime schema validation, and schema bundle accessor.

Deliverables (Complete)

• SchemaRegistry — loads and indexes all JSON Schema files, resolves $ref (absolute, relative, fragment)
• SchemaPreprocessor — normalizes schemas (strips conditional allOf, array length constraints, conditionals)
• TypeRegistry — maps schema paths to Java ClassName + TypeCategory
• SchemaCodegen — full code generator: records, enums, sealed interfaces, builders, inline unions
• AdcpSchemaValidator — thread-safe schema validation with networknt/json-schema-validator
• AdcpObjectMapperFactory — Jackson ObjectMapper configured for AdCP payloads
• SchemaBundle — runtime classpath schema accessor
• ResponseSchemaValidationError — typed error for storyboard runner
• @XEntity annotation — runtime annotation for entity identity
• JSpecify @NullMarked package-info.java for all generated packages
• x-enum-descriptions, x-deprecated-enum-values, x-extensible extension processing
• Multi-discriminator support with defaultImpl fallback
• 72 tests across 9 test classes, all green