No known security advisories.
The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.
py4j has 108.1M monthly downloads and 1K GitHub stars. Version 0.10.9.9, first published in 2009.
It is actively maintained under a permissive license, last released in Jan 2025.
It is used by 134 tracked packages, including pyspark, databricks-connect and apache-flink.
GitHub topics include java, distributed-systems and programming-languages.
Package Insights
Package Risks
- No releases in 512 days despite active commits
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
90
Popularity
67
Adoption
70
Community
60
Provenance
0
How the maintenance status was determined
Last commit
25 days ago
Monthly downloads
108,124,770
•
Active
Activity within 30 days
Stable
Activity within 31-180 days
Minimal
Activity within 181-365 days, or no activity data
At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
108,124,770
Stars
1,287
Stars per 1k downloads
0.01
•
Industry Standard
> 10,000,000 monthly downloads
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
Community Favorite
> 5 stars per 1k downloads
Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
3,561,329
Month daily avg
3,604,159
Momentum
-1.2%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100Python version support tiers
requires_python
Not specified
Cutting Edge
Minimum supported version is 3.12 or newer
Modern
Minimum supported version is 3.9, 3.10, or 3.11
Legacy
Supports 3.8 or older (or Python 2)
•
Unknown
No requires_python specified or unparseable
Package does not declare a minimum Python version.
License categories
License
BSD License
•
Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
537 days ago
Total releases
34
Releases/year
2.1
Rapid
Last release within 365 days and > 12 releases/year
Regular
Last release within 365 days
•
Slow
Last release 366-730 days ago
Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
41
Monthly downloads
108,124,770
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
•
Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
66
Issue Burden
122.8
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
17.4%
contrib / forks
Stale Release
512d
PR Velocity
Active
Weekly Downloads
GitHub Stars
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.
Downloads by OS
Linux
2.9M
Windows
3.2K
macOS
1.5K
Python Versions
3.11
30.1%
838.9K
3.12
27.9%
776.8K
3.10
19.4%
540.1K
3.7
12.6%
351.1K
3.9
10.0%
279.3K
Top Countries
1.
US
2.0M
US
2.
NL
198.6K
NL
3.
IE
181.5K
IE
4.
IN
162.2K
IN
5.
SG
104.7K
SG
6.
DE
64.9K
DE
7.
GB
39.1K
GB
8.
BR
33.4K
BR
9.
CA
30.1K
CA
10.
JP
25.6K
JP
Dependencies
0
No dependencies
Used By
134
- pyspark
- databricks-connect
- apache-flink
- datarobot-predict
- snowpark-connect
- datarobot-mlops
- zipline-ai
- pypmml
- fabricks
- javac-parser
- mxcubecore
- salesforce-merlion
- negmas
- sws-spark-dissemination-helper
- libecalc
- koalanlp
- jpmml-evaluator
- mlpiper
- pynlpclassifier
- pyspark2pmml
- atoti-client
- bodosql
- iso15118
- scienceworld
- ververica-flink
- zingg
- vsm
- apache-dolphinscheduler
- aissemble-foundation-messaging-python
- azulero
- awx-zipline-ai
- twa
- textworld-express
- bodo-iceberg-connector
- temporal-normalization-spacy
- neuropythy
- cp-pyflink
- ndtkit-api
- brel-xbrl
- robotframework-velo-sapgui
- cs103-scienceworld
- lolopy
- canapy
- geniusrise
- oliver
- pyalink-flink-1-9
- musket-core
- runzi
- maven-decoder-mcp
- osgiservicebridge
GitHub Topics
Tags from the package's GitHub repository describing what it does.
Package Information
License
BSD License
First Release
December 23, 2009
Last Release
1 year ago
Last Commit
3 weeks ago
Latest Version
0.10.9.9
Total Releases
34
Contributors
41
Open PRs
23
Archived
No
Author
Barthelemy Dagenais
Python Versions
2
3.8
3.9
3.10
3.11
3.12
Wheels
py2
py3
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh