tchivs opened a new issue, #35617:
URL: https://github.com/apache/beam/issues/35617
### What happened?
/take-issue
## Bug Description
The `JavaJarProvider.available()` method in
`apache_beam/yaml/yaml_provider.py` uses the Unix-specific `which` command to
check for Java availability, which causes a `FileNotFoundError` on Windows
systems.
## Environment
- **OS**: Windows 10/11
- **Python version**: 3.12.10
- **Apache Beam version**: Latest (from main branch)
- **Error location**: `apache_beam/yaml/yaml_provider.py:388`
## Error Details
```
FileNotFoundError: [WinError 2] 系统找不到指定的文件。
File "apache_beam\yaml\yaml_provider.py", line 388, in available
trial = subprocess.run(['which', 'java'], capture_output=True)
```
## Root Cause
The `which` command is Unix/Linux specific and doesn't exist on Windows.
Windows uses the `where` command for similar functionality.
## Current Code
```python
def available(self):
# pylint: disable=subprocess-run-check
trial = subprocess.run(['which', 'java'], capture_output=True)
if trial.returncode == 0:
return True
else:
# ... error handling
```
## Expected Behavior
The YAML provider should work correctly on all supported platforms including
Windows.
## Proposed Solution
Use platform-specific commands:
- **Windows**: `where java`
- **Unix/Linux**: `which java`
- **Fallback**: `shutil.which('java')` for cross-platform compatibility
## Impact
This affects all Windows users trying to use Apache Beam's YAML
functionality, preventing them from using this feature entirely.
## Workaround
Currently, users need to either:
1. Install a Unix-like environment (WSL, Git Bash, etc.)
2. Create a custom `which.bat` script
3. Apply manual patches to the source code
## Additional Context
This is a cross-platform compatibility issue that should be straightforward
to fix with platform detection.
## Labels
/add-labels bug,P2,windows,yaml,cross-platform
### Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
### Issue Components
- [x] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [x] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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