Everything in CAP / Java
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Content: 2020
Java: Answers in Java
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Domain Learning & ReferenceDomain Data & PersistenceDomain Developer ExperiencePublished 2020Clear all
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E2E: SAP Cloud Platform Internet of Things to SAP Analytics CloudE2E: SAP Cloud Platform Internet of Things to SAP Analytics CloudDevice data from ingestion to chart, with CAP occupying the middle: a CDS-defined persistence on HANA Cloud, and an OData service published from it for Analytics Cloud to consume live. The interesting choice is that CAP is used for the model rather than for business logic — there is barely any.Gunter, published 2020-08-31
Data modellingSAP only
First Java Cap ApplicationFirst Java Cap ApplicationA step-by-step walkthrough of a first CAP Java project: com.sap.cds:cds-services-archetype scaffolds the initial Maven project, and the domain model is then rewritten in the db folder with entities, the cuid and managed aspects, associations, compositions and a CodeList, so a hand-coded event handler serving a single entity gives way to a service that CAP's generic persistence handling serves without custom code. It deploys that model to SQLite for local development — cds deploy --to sqlite, then a Spring profile pointing at the generated database file — and ends by adding an index.cds so the model and service can be published as a reusable npm module.bruce_wang3, published 2020-12-08
Database connectorsSAP only
First Java Cap ApplicationFirst Java Cap ApplicationA step-by-step walkthrough of a first CAP Java project: com.sap.cds:cds-services-archetype scaffolds the initial Maven project, and the domain model is then rewritten in the db folder with entities, the cuid and managed aspects, associations, compositions and a CodeList, so a hand-coded event handler serving a single entity gives way to a service that CAP's generic persistence handling serves without custom code. It deploys that model to SQLite for local development — cds deploy --to sqlite, then a Spring profile pointing at the generated database file — and ends by adding an index.cds so the model and service can be published as a reusable npm module.bruce_wang3, published 2020-12-08
Getting started with CAP on PostgreSQL (Node.js)Getting started with CAP on PostgreSQL (Node.js)Running CAP on PostgreSQL locally in 2020, when doing so meant the community packages cds-pg and cds-dbm. It now opens with a banner the author added later: @sap/cds 7.0.0 has native PostgreSQL support, use @cap-js/postgres instead, with a pointer to a step-by-step guide for it. Worth having for that banner as much as for the content — a post that tells you not to follow it is a dated fact about where the answer moved.published 2020-11-16
Getting started with CAP on PostgreSQL (Node.js)
cds-pg. Affects Runnable code.
PostgreSQL persistence adapter for CAP (Node.js)PostgreSQL persistence adapter for CAP (Node.js)The contradiction the adapter was built to resolve, stated plainly in 2020: CAP's core is open, non-intrusive and platform-agnostic, which is what would let it run outside SAP's world — except that HANA was the only officially supported production persistence and HANA exists only inside BTP. cds-pg is the answer to that, and this is the post that argues for it. Read now as the front end of a story whose other end is the 2023 post recording cds-pg's deprecation in favour of @cap-js/postgres.published 2020-08-20
PostgreSQL persistence adapter for CAP (Node.js)
cds-pg is archived. @cap-js/postgres answers the same capability. Affects Runnable code.
Run and Deploy CAP with PostgreSQL on SAP BTP Cloud Foundry (Node.js)Run and Deploy CAP with PostgreSQL on SAP BTP Cloud Foundry (Node.js)The deployment half of the pair, two weeks after the local one, and superseded the same way: it carries the same banner directing readers to @cap-js/postgres and the official documentation. The two together are the community PostgreSQL path as it stood before the core absorbed it.published 2020-11-30
Run and Deploy CAP with PostgreSQL on SAP BTP Cloud Foundry (Node.js)
cds-dbm. Affects Runnable code.
SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1Introduces SAP Cloud Application Programming Model as an open, opinionated framework that shoulders OData plumbing and database-specific code so a domain is modelled once in CDS, then builds a small bookshop project to show it: @sap/cds-dk's cds init scaffolds the project, cds watch serves it locally with live reload against an in-memory SQLite database, and a CatalogService projects a CDS domain model seeded from CSV files. The result is read as an OData service in the browser and exercised further through a Postman collection, with the optional @sap/vscode-cds extension noted for CDS syntax highlighting and completion in VS Code.rasai, published 2020-12-31
Editor supportSAP and community
Developing CAP applications in SAP Business Application StudioDeveloping CAP applications in SAP Business Application StudioThe overview written at the point BAS replaced Web IDE, and it is structured as a comparison — each step of building a CAP application, with the difference from the Web IDE experience called out beside it. Useful now mostly for what it records: which parts of CAP development the editor took over, and when.liat_b, published 2020-07-06
Migrating Your CAP Applications from SAP Web IDE to SAP Business Application StudioMigrating Your CAP Applications from SAP Web IDE to SAP Business Application StudioA migration checklist, and a reminder of how much of a CAP project used to be editor-specific: Web IDE configuration files to delete, a build to move to the Cloud MTA Build Tool, a CAP Java version to raise. Historical — Web IDE is gone — but it is the clearest list of what the tooling boundary used to include.liat_b, published 2020-07-09
Migrating Your CAP Applications from SAP Web IDE to SAP Business Application Studio
Editor support changed in @sap/cds-dk 8.8.0, 2025-03-04. Affects A recipe.
Running CAP Node Applications in SAP Business Application StudioRunning CAP Node Applications in SAP Business Application StudioThe Run Configurations tool, which is where binding and mocking live in BAS rather than in a terminal. Three things it does: several named configurations per application in a tree, dependencies bound to real service instances, and OData dependencies mocked. The author notes the configurations are standard launch entries underneath, which is the detail that lets you leave the tool behind if you want to.liat_b, published 2020-10-22
SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1Introduces SAP Cloud Application Programming Model as an open, opinionated framework that shoulders OData plumbing and database-specific code so a domain is modelled once in CDS, then builds a small bookshop project to show it: @sap/cds-dk's cds init scaffolds the project, cds watch serves it locally with live reload against an in-memory SQLite database, and a CatalogService projects a CDS domain model seeded from CSV files. The result is read as an OData service in the browser and exercised further through a Postman collection, with the optional @sap/vscode-cds extension noted for CDS syntax highlighting and completion in VS Code.rasai, published 2020-12-31
GeneratorsSAP and community
cf-create-app: Create End-to-End apps and deploy to Cloud Foundry in minutescf-create-app: Create End-to-End apps and deploy to Cloud Foundry in minutesA generator from 2020 that goes further than scaffolding — an end-to-end application created and deployed to Cloud Foundry in one run. Predates most of what cds add now does.former_member604013, published 2020-07-29
cf-create-app: Create End-to-End apps and deploy to Cloud Foundry in minutes
Generators has changed twice since this was published, most recently in @sap/cds-dk 10.0.3, 2026-07-02. Affects A recipe, Runnable code.
First Java Cap ApplicationFirst Java Cap ApplicationA step-by-step walkthrough of a first CAP Java project: com.sap.cds:cds-services-archetype scaffolds the initial Maven project, and the domain model is then rewritten in the db folder with entities, the cuid and managed aspects, associations, compositions and a CodeList, so a hand-coded event handler serving a single entity gives way to a service that CAP's generic persistence handling serves without custom code. It deploys that model to SQLite for local development — cds deploy --to sqlite, then a Spring profile pointing at the generated database file — and ends by adding an index.cds so the model and service can be published as a reusable npm module.bruce_wang3, published 2020-12-08
SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1Introduces SAP Cloud Application Programming Model as an open, opinionated framework that shoulders OData plumbing and database-specific code so a domain is modelled once in CDS, then builds a small bookshop project to show it: @sap/cds-dk's cds init scaffolds the project, cds watch serves it locally with live reload against an in-memory SQLite database, and a CatalogService projects a CDS domain model seeded from CSV files. The result is read as an OData service in the browser and exercised further through a Postman collection, with the optional @sap/vscode-cds extension noted for CDS syntax highlighting and completion in VS Code.rasai, published 2020-12-31
Local developmentSAP only
Develop SAP CAP apps inside a VS Code Docker ContainerDevelop SAP CAP apps inside a VS Code Docker ContainerA VS Code dev container configuration with everything a CAP project needs already in it, published as a repository rather than as instructions. The 2020 half of a pair whose other half, four years later, does the same for Lazyvim — the same author solving the same problem twice as his editor changed.published 2020-02-20
Develop SAP CAP apps inside a VS Code Docker Container
Local development has changed twice since this was published, most recently in @sap/cds-dk 7.9.1, 2024-05-02. Affects Runnable code.
Running CAP Node Applications in SAP Business Application StudioRunning CAP Node Applications in SAP Business Application StudioThe Run Configurations tool, which is where binding and mocking live in BAS rather than in a terminal. Three things it does: several named configurations per application in a tree, dependencies bound to real service instances, and OData dependencies mocked. The author notes the configurations are standard launch entries underneath, which is the detail that lets you leave the tool behind if you want to.liat_b, published 2020-10-22
SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1Introduces SAP Cloud Application Programming Model as an open, opinionated framework that shoulders OData plumbing and database-specific code so a domain is modelled once in CDS, then builds a small bookshop project to show it: @sap/cds-dk's cds init scaffolds the project, cds watch serves it locally with live reload against an in-memory SQLite database, and a CatalogService projects a CDS domain model seeded from CSV files. The result is read as an OData service in the browser and exercised further through a Postman collection, with the optional @sap/vscode-cds extension noted for CDS syntax highlighting and completion in VS Code.rasai, published 2020-12-31
Use SCP CF Destination service in NodeJs locallyUse SCP CF Destination service in NodeJs locallyReading a destination from a laptop, where the environment variable the destination service normally provides does not exist. A small gap with a real cost, since the alternative is deploying to test every change to a remote call.WouterLemaire, published 2020-05-28
Use SCP CF Destination service in NodeJs locally
Destinations changed in @sap-cloud-sdk/connectivity 4.0.0, 2025-03-04. Affects Runnable code.
Seed dataCommunity only
CAP: Consume External Service - Part 1CAP: Consume External Service - Part 1Builds a CAP Node.js service from scratch that consumes the public NorthWind OData V4 service: cds import turns its EDMX metadata into a CSN model under srv/external, and a CatalogService projects Products from it with a custom READ handler that runs the request through cds.connect.to('NorthWind'). Shows the same projection working two ways — against a CSV mocked under srv/external/data with the <service>-<entity>.csv naming the framework expects, then against the real service once credentials.url is added to the CAP configuration and @sap-cloud-sdk/http-client is installed — and defers routing that connection through the Cloud Foundry Destinations service to the next post in the series.published 2020-05-26
TestingSAP and community
CAP: Unit Testing using Mocha and ChaiCAP: Unit Testing using Mocha and ChaiUnit tests added to an existing CAP service rather than written alongside a new one, which is the harder and more common case. Mocha and Chai wired up by hand, from a time before cds.test was the obvious answer.jhodel18, published 2020-05-31
CAP: Unit Testing using Mocha and Chai
Testing has changed 3 times since this was published, most recently in @cap-js/cds-test 1.0.0, 2026-04-23. Affects Runnable code.
Integration Tests in a Cloud Foundry Java App using SAP Cloud Application Programming ModelIntegration Tests in a Cloud Foundry Java App using SAP Cloud Application Programming ModelIntegration rather than unit tests, and from 2020 — the earliest testing entry here, and a reminder of what had to be assembled by hand before the framework had an answer.former_member428487, published 2020-02-23
Integration Tests in a Cloud Foundry Java App using SAP Cloud Application Programming Model
Testing has changed 3 times since this was published, most recently in @cap-js/cds-test 1.0.0, 2026-04-23. Affects Runnable code.
TypeScript patternsDoes not apply
Taking CAP to the next level - with TypeScriptTaking CAP to the next level - with TypeScriptThe author's own two packages introduced together, and they are two halves of one idea: cds2types generates TypeScript from the CDS model, cds-routing-handlers arranges the handlers that use them. Published in 2020, years before cds-typer, which makes it the earliest answer in the graph to a question the core answered later.published 2020-05-22
Taking CAP to the next level - with TypeScript
cds-routing-handlers: release and repository quiet for 46 months. Affects Runnable code.
Reference appsCommunity only
UI5ers Buzz #56: New full-stack UI5 sample app featuring CAP + OData V4 + draft modeUI5ers Buzz #56: New full-stack UI5 sample app featuring CAP + OData V4 + draft modeA sample app published as code rather than described — SAPUI5 over a CAP service with OData V4 and draft mode — and the note that it was built on what the team learned from an application written in March 2020 to help the German Foreign Office repatriate citizens. That provenance is unusual and worth keeping.AndreasKunz, published 2020-11-06