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authoring-java-sdk-tasks

Skill

Writes Airflow task logic in Java, Kotlin, or any JVM language using the Airflow Java SDK. Use when the user wants to implement Airflow tasks in Java/JVM, asks about `@Builder.Dag`/`@Builder.Task`/`@Builder.XCom`, the `Task`/`BundleBuilder` interfaces, reading connections/variables/XComs from Java,

412Monitoring

Install

git clone https://github.com/astronomer/agents.git ~/.claude/skills/authoring-java-sdk-tasks

What is authoring-java-sdk-tasks?

Writes Airflow task logic in Java, Kotlin, or any JVM language using the Airflow Java SDK. Use when the user wants to implement Airflow tasks in Java/JVM, asks about `@Builder.Dag`/`@Builder.Task`/`@Builder.XCom`, the `Task`/`BundleBuilder` interfaces, reading connections/variables/XComs from Java, the JSON-to-Java type mapping, or logging from Java tasks. This skill covers the Java-specific native API; the shared Python-stub pattern and conceptual model live in authoring-language-sdk-tasks. For building/shipping the bundle see deploying-java-sdk-bundles; for coordinator config see configuring-airflow-language-sdks.

What this can do

Capabilities declared in this component's own frontmatter — not inferred.

Inherit all session tools

Declares no tool restrictions — inherits every session tool

~156 tokens of context used while enabled, before you invoke anything

Trust

87/100 · Excellent

2 factors scored below maximum

Documentation

README · ~6 min read

Authoring Java SDK Tasks

The Airflow Java SDK implements the language-SDK model for the JVM: your DAG stays in Python, and each task instance runs in a short-lived JVM subprocess. This skill covers the Java-specific native API. The shared model — the Python @task.stub pattern, ID matching, and the XCom-as-JSON contract — lives in authoring-language-sdk-tasks; read that first if you're new to language SDKs.

Experimental. The Java SDK is in preview. Artifact coordinates and APIs may change.

Related skills: authoring-language-sdk-tasks (shared Python stub + concepts), configuring-airflow-language-sdks (route the queue to JavaCoordinator), deploying-java-sdk-bundles (compile and ship the JAR).

Recap: the Python side

Java tasks are paired with Python stubs that carry no logic — they declare the task, queue, dependency graph, and retries. IDs must match the Java annotations exactly, and an upstream argument on a stub only declares the dependency (the value is fetched in Java). Full rules are in authoring-language-sdk-tasks; the minimal shape:

from airflow.sdk import dag, task


@dag

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