java-sdk/sdk/module.md

# Module sdk

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The Apache Airflow Java SDK — author and run Airflow task implementations in JVM languages.

## Language SDK compatibility matrix

Which Airflow TaskInstance states and capabilities the Java SDK currently supports. The normative
meaning of each dimension is defined in the
[Language SDK conformance specification](https://github.com/apache/airflow/blob/main/contributing-docs/30_new_language_sdk.rst).

<!-- BEGIN AUTO-GENERATED LANG-SDK COMPAT MATRIX -->

*Min. Airflow version: 3.3 · supervisor schema: 2026-06-16*

| Dimension | Tier | Supported | Since | Notes |
|---|---|---|---|---|
| **TaskInstance states** |  |  |  |  |
| state: `success` | MUST | ✓ | 3.3 |  |
| state: `failed` | MUST | ✓ | 3.3 |  |
| state: `up_for_retry` | MUST | ✓ | 3.3 | RetryTask |
| state: `skipped` | SHOULD | ✗ | – | runtime does not emit TaskState skipped yet |
| state: `deferred` | MAY | ✗ | – | runtime does not emit DeferTask yet |
| state: `up_for_reschedule` | MAY | ✗ | – | runtime does not emit RescheduleTask yet |
| state: `awaiting_input` | MAY | ✗ | – | runtime does not emit AwaitInputTask yet |
| state: `removed` | MAY | ✓ | 3.3 |  |
| **Runtime capabilities** |  |  |  |  |
| capability: `mixed-lang-stub-target` | MUST | ✓ | 3.3 | @task.stub |
| capability: `task-logging` | MUST | ✓ | 3.3 | SLF4J + JPL bridged to the task log |
| capability: `xcom-read-write` | MUST | ✓ | 3.3 |  |
| capability: `connection-read` | MUST | ✓ | 3.3 |  |
| capability: `variable-read-write` | MUST | ✗ | – | getVariable only; no write over the comm socket yet |
| capability: `self-contained-bundle` | MUST | ✓ | 3.3 | Airflow metadata embedded in the jar artifact |
| capability: `retry-policy` | MAY | ✗ | – | no task-facing retry-policy API yet |
| capability: `task-state-store` | MAY | ✗ | – | no task-facing state-store API yet |
| capability: `asset-state-store` | MAY | ✗ | – | no task-facing state-store API yet |
| capability: `asset-event-emit` | MAY | ✗ | – | runtime does not emit asset events yet |
| capability: `asset-event-read` | MAY | ✗ | – | no task-facing asset-event API yet |
| **Native-Dag authoring** |  |  |  |  |
| capability: `native-dag-authoring` | SHOULD | ✗ | – | native Dag authoring not implemented yet |
| capability: `task-args` | MUST † | n/a | – |  |
| capability: `dag-params` | MUST † | n/a | – |  |
| capability: `taskflow-dependencies` | MUST † | n/a | – |  |
| capability: `branching` | SHOULD † | n/a | – |  |
| capability: `dag-test` | SHOULD † | n/a | – |  |
| capability: `task-group` | MAY † | n/a | – |  |
| capability: `dynamic-task-mapping` | MAY † | n/a | – |  |
| capability: `asset-inlets-outlets` | MAY † | n/a | – |  |
| capability: `asset-scheduling` | MAY † | n/a | – |  |
| capability: `object-store` | MAY † | n/a | – |  |

*Marks: ✓ supported · ✗ not supported · n/a not applicable. A tier marked † applies only when `native-dag-authoring` is supported.*

<!-- END AUTO-GENERATED LANG-SDK COMPAT MATRIX -->