FrankYang0529 opened a new pull request, #69827:
URL: https://github.com/apache/airflow/pull/69827
## Why
- A `Task` class without a public no-argument constructor (or a non-static
inner class fails with a generic `Error executing task` plus a raw reflection
trace which steering Dag authors toward debugging `execute()` logic that never
ran.
## How
- Split instantiation from execution in `TaskRunner.runTask`: instantiation
failures now log `Cannot instantiate task class. A task class must be concrete
and declare a public no-argument constructor` with a `taskClass` field.
- Removed the redundant `e.printStackTrace()`. The structured log record
already carries the full trace.
- Documented the constructor requirement in the interface-API section of
`java.rst`.
## Verification
- `./gradlew :sdk:test --tests "org.apache.airflow.sdk.execution.TaskTest"`
- `E2E_TEST_MODE=java_sdk uv run --project airflow-e2e-tests pytest
"tests/airflow_e2e_tests/java_sdk_tests/test_java_sdk_dag.py::TestJavaSDKUninstantiableExample"
-xvs`
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