CAP Java Architecture — CDS, Event Handlers & CQN Query API

Lesson 3.1 — CAP Java Architecture & Core Concepts Table of Contents 1. CAP Java Architecture Overview 2. CDS Compilation Pipeline 3. Event Handler Model 4. CQN Query API 5. Project Structure Top 5 Pitfalls What to Learn Next Summary: The SAP Cloud Application Programming Model (CAP) for Java provides a framework built on Spring Boot that adds CDS-based domain modeling, a generic runtime for OData/REST services, an event-driven handler model, and built-in BTP service integration. This lesson covers the CAP Java architecture, CDS compilation pipeline, the event/handler model, CQN query API, and how CAP compares to pure Spring Boot development. 1. CAP Java Architecture Overview ┌─────────────────────────────────────────────────────────────┐ │ CAP Java Application │ │ │ │ ┌─────────────────────────────────────────────────────┐ │ │ │ CDS Model Layer (.cds files) │ │ │ │ - Domain entities, types, associations │ │ │ │ - Service definitions (projections, actions) │ │ │ │ - Annotations (UI, au