SDK reference

Explore the SDK by subject. Each chapter starts with ordinary use, then covers more specific behavior. For a complete task, use the how-to guides.

Messaging

Send and handle messages, schedule work, and connect through HTTP or WebSockets.

Sending · Handling · Consumers · Scheduling · HTTP · WebSockets

Modeling & persistence

Define application state, connect related Models, and choose how to store and query them.

Updates · Relationships · Graphs · Persistence · Search · Stateful handlers

Data control & serialization

Protect sensitive values, evolve stored data, and control what each reader can see.

Data protection · Data evolution · Response filtering

Configuration

Connect your application to its environment and customize SDK behavior.

Application properties · Fluxzero builder · Client configuration

Use error codes to investigate a failure and the SDK Javadoc for individual types and methods. Project setup, publishing and deployment are covered in Tools & automation.