Helidon Declarative as a new feature set for Helidon SE, build-time dependency injection with zero reflection capability, code generation approach that creates actual Java source files instead of bytecode manipulation, Service Registry as an enhanced Java service loader with ordering capabilities, compatibility with GraalVM for native image compilation, JPMS (Java Platform Module System) compatibility, the Maven plugin that eliminates reflection completely, HTTP module for declarative REST endpoints, REST client generation, metrics and fault tolerance support, interceptors for modifying service creation behavior, annotation mapping to support standard JSR-330 annotations like @Inject, comparison of performance between Helidon SE and MP flavors, use cases for serverless and CLI applications, the incubating status of Helidon Declarative with full release planned for Helidon 5, the ability to see and modify generated code for better debugging and transparency, the possibility to copy generated code to take ownership and remove dependencies, the value of using standard annotations for better portability between frameworks

David Kral on twitter: @VerdentDK