Capabilities at a glance

Everything the Java SDK can do, with a link to each guide.

A map of the Java SDK's features. Everything here runs over the shared Rust core — pick a backend, describe tasks, run workers.

Core

Feature	Guide
Typed task descriptors, enqueue, read results	Tasks
SQLite / Postgres / Redis backends	Installation
Named queues, priority, pause/resume	Queues
Cron-scheduled & delayed jobs	Scheduling
Cooperative cancellation & progress	Cancellation
Partial results via task logs	Streaming
Execution model (thread pools, autoscaling)	Execution model
Topic pub/sub fan-out to independent subscribers	Pub/Sub
Compile-time `TaskHandler` bindings (no reflection)	Tasks

Reliability

Feature	Guide
Retries with backoff curves (`RetryPolicy`), dead-letter queue	Retries · Dead-letter
Per-attempt timeouts	Timeouts
Circuit breakers (`CircuitBreakerConfig`)	Circuit breakers
Idempotent enqueue (`uniqueKey`)	Idempotency
Distributed locks	Locks
At-least-once delivery	Guarantees

Orchestration

Feature	Guide
DAG workflows: fan-out/in, conditions, gates, sub-workflows, sagas, visualization	Workflows
Decentralized work-stealing mesh	Mesh

Extensibility

Feature	Guide
Lifecycle events & middleware	Events · Middleware
Signed webhook delivery	Webhooks
Resource injection, enqueue predicates & interception	Resources · Predicates
Signed cross-process references (proxies)	Resources
Pluggable serializers (JSON / MessagePack / signed / encrypted) & payload codecs	Serializers
Producer-side batching (`Batcher`)	Batching

Observability & ops

Feature	Guide
Stats, metrics, progress, worker heartbeats	Monitoring
Micrometer Observation / Sentry middleware	Integrations
React dashboard + REST API	Dashboard
In-process autoscaling + KEDA scaler endpoint	Autoscaling
Standalone CLI	CLI

Framework integrations

Spring Boot 3 starter — auto-configures a FlexiQ bean from flexiq.url / flexiq.pool-size / flexiq.namespace.

Observability and MessagePack dependencies are compileOnly — add io.micrometer:micrometer-observation, io.sentry:sentry, or org.msgpack:jackson-dataformat-msgpack only if you use them.