johnhoran opened a new issue, #64649:
URL: https://github.com/apache/airflow/issues/64649
### Apache Airflow version
3.1.7
### What happened and how to reproduce it?
I am trying to port a Notifier to airflow 3 and ran into an issue when
trying to run the code though `airflow dags test`. I reduced my dag down to
```python
import logging
from datetime import datetime
from airflow import DAG
from airflow.sdk import BaseNotifier, task
class MyNotifier(BaseNotifier):
log = logging.getLogger("MyNotifier")
def notify(self, *args) -> None:
self.log.info("Sending a really lovely message")
@task
def failing_task():
"""This task will intentionally fail."""
raise Exception("This DAG is designed to fail!")
with DAG(
dag_id="bad_dag",
start_date=datetime(2024, 1, 1),
schedule=None,
catchup=False,
tags=["test", "failing"],
on_failure_callback=MyNotifier(),
) as dag:
fail_task = failing_task()
```
And then when I run `airflow dags test bad_dag 2025-10-03T08:00:00`, the
task fails as expected, but then an error is thrown
```
[2026-04-02T21:35:01.741165Z] {dagrun.py:1453} ERROR - Callback failed for
bad_dag
Traceback (most recent call last):
File
"/Users/jhoran/Workspace/eda_astronomer/.venv/lib/python3.12/site-packages/airflow/models/dagrun.py",
line 1451, in handle_dag_callback
callback(context)
File
"/Users/jhoran/Workspace/eda_astronomer/.venv/lib/python3.12/site-packages/airflow/sdk/bases/notifier.py",
line 136, in __call__
self.render_template_fields(context)
File
"/Users/jhoran/Workspace/eda_astronomer/.venv/lib/python3.12/site-packages/airflow/sdk/bases/notifier.py",
line 92, in render_template_fields
jinja_env = self.get_template_env(dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/jhoran/Workspace/eda_astronomer/.venv/lib/python3.12/site-packages/airflow/sdk/definitions/_internal/templater.py",
line 79, in get_template_env
return dag.get_template_env(force_sandboxed=False)
^^^^^^^^^^^^^^^^^^^^
AttributeError: 'SerializedDAG' object has no attribute 'get_template_env'
```
I tried running the same dag in astronomer, there I didn't see any failure
but I also didn't get any log output, so I can only assume it's working there.
### What you think should happen instead?
_No response_
### Operating System
_No response_
### Versions of Apache Airflow Providers
_No response_
### Deployment
Virtualenv installation
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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