CAP Remote Services & Mashups — Consuming External APIs

Lesson 3.3 — CAP Remote Services & Mashups Table of Contents 1. Remote Service Architecture 2. Importing External Service Definitions 3. Destination Configuration 4. Consuming Remote Services in Handlers 5. Error Handling & Resilience Top 5 Pitfalls What to Learn Next Summary: CAP Java supports integrating external services — S/4HANA OData APIs, REST APIs, and other CAP services — as "remote services" defined in CDS. This enables mashup scenarios where your application combines local data with remote data, projecting external entities alongside your own. This lesson covers importing external APIs, the Destination Service, remote service consumption, mashup patterns, and error handling. 1. Remote Service Architecture ┌────────────────────────────────────────────────────────────┐ │ CAP Java Application │ │ │ │ ┌─────────────────────────────────────────────────────┐ │ │ │ CDS Model │ │ │ │ ┌──────────────┐ ┌──────────────────────────────┐ │ │ │ │ │ Local Entities│ │ External Service (impo