Groups

Py4J Support and Comments

1–30 of 168

0 selected

Mar 10

Hi. I'm the author of a distribution provider that uses/depends upon Py4j for Java<->Python

unread,

Hi. I'm the author of a distribution provider that uses/depends upon Py4j for Java<->Python

Mar 10

11/16/24

No stdout from Python process started by ProcessBuilder in the Java application

Update: Using `inheritIO()` before actually specifying any of the redirects fixes the issue. I'm

unread,

No stdout from Python process started by ProcessBuilder in the Java application

Update: Using `inheritIO()` before actually specifying any of the redirects fixes the issue. I'm

11/16/24

Evelyn, Jonah Graham2

11/12/24

Hi Evelyn, At a high level I would say that yes Py4J would do the trick. Py4J makes it relatively

unread,

Hi Evelyn, At a high level I would say that yes Py4J would do the trick. Py4J makes it relatively

11/12/24

7/8/24

Supporting recursion between Python and Java

Hello, I have a recursive method written on the Python side that, for each recursive call, makes a

unread,

Supporting recursion between Python and Java

Hello, I have a recursive method written on the Python side that, for each recursive call, makes a

7/8/24

1/5/24

Anyone put a py java single codebase into a container onto GCP ? JVM included.. JRE?

or had to use jpackage then wrap it into a container.. confused how to put a py3 interpreter into

unread,

Anyone put a py java single codebase into a container onto GCP ? JVM included.. JRE?

or had to use jpackage then wrap it into a container.. confused how to put a py3 interpreter into

1/5/24

Siddharth Jain, Jonah Graham2

11/16/23

An error occurred while calling z:java.nio.file.Path.of. Method of([class java.lang.String]) does not exist

Hi, The issue is that Path.of(String) method doesn't actually exist, your link was to Path.of(

unread,

An error occurred while calling z:java.nio.file.Path.of. Method of([class java.lang.String]) does not exist

Hi, The issue is that Path.of(String) method doesn't actually exist, your link was to Path.of(

11/16/23

11/15/23

How to use a non built-in data type?

I read the Py4J docs and they explain how to use the library with built-in data types. I have a Java

unread,

How to use a non built-in data type?

I read the Py4J docs and they explain how to use the library with built-in data types. I have a Java

11/15/23

10/19/23

TypeError: 'NoneType' object is not callable in java_gateway.py

I am using this lib which is a wrapper for some Java code and in turn uses py4j. For some reason when

unread,

TypeError: 'NoneType' object is not callable in java_gateway.py

I am using this lib which is a wrapper for some Java code and in turn uses py4j. For some reason when

10/19/23

8/29/23

How to call a Java method that takes an object as argument?

nevermind. found the answer here: https://stackoverflow.com/a/14455834/147530. i wasn't passing

unread,

How to call a Java method that takes an object as argument?

nevermind. found the answer here: https://stackoverflow.com/a/14455834/147530. i wasn't passing

8/29/23

Siddharth Jain, Jonah Graham2

8/20/23

Newbie questions on Getting Started

Hi S. The py4j already comes as a pip installable module you can add to your module's

unread,

Newbie questions on Getting Started

Hi S. The py4j already comes as a pip installable module you can add to your module's

8/20/23

5/5/23

py4j.Py4JException: Method testConnection([]) does not exist

I resolved my issue. I needed to add a "exports" declaration in the module-info file. On

unread,

py4j.Py4JException: Method testConnection([]) does not exist

I resolved my issue. I needed to add a "exports" declaration in the module-info file. On

5/5/23

3/25/23

py4j.protocol.Py4JJavaError: An error occurred while calling o10.execute.

Hi, I am consuming kafka topic using Apache Flink Consumer. My code is really simple as right now I

unread,

py4j.protocol.Py4JJavaError: An error occurred while calling o10.execute.

Hi, I am consuming kafka topic using Apache Flink Consumer. My code is really simple as right now I

3/25/23

P S, Jonah Graham6

3/22/23

py4j without gateway in the java

Short answer is it works for me. Did you compile AdditionApplication into the py4j-java.jar? I

unread,

py4j without gateway in the java

Short answer is it works for me. Did you compile AdditionApplication into the py4j-java.jar? I

3/22/23

christopher grant

1/14/23

Scala Map to Python dict

Hi all, I love py4j. Great project, thanks for your work! I'm having some trouble right now,

unread,

Scala Map to Python dict

Hi all, I love py4j. Great project, thanks for your work! I'm having some trouble right now,

1/14/23

Tom, Jonah Graham2

12/22/22

Access to protected or private members?

Short answer is yes it is possible. Jonah On Thu, Dec 22, 2022 at 4:00 PM Tom <tom....@gmail.com

unread,

Access to protected or private members?

Short answer is yes it is possible. Jonah On Thu, Dec 22, 2022 at 4:00 PM Tom <tom....@gmail.com

12/22/22

Richard van Bemmelen, … אורן קוברטובסקי6

8/31/22

connecting to remote Python

Hello, are there any updates on how to solve this problem? On Sunday, 10 December 2017 at 22:41:20

unread,

connecting to remote Python

Hello, are there any updates on how to solve this problem? On Sunday, 10 December 2017 at 22:41:20

8/31/22

Vito Baggiolini

8/2/22

Better solution to call Java methods that are reserved keywords in Python

Hello everybody, I work at CERN where we use (py)spark and therefore py4j for our big data system

unread,

Better solution to call Java methods that are reserved keywords in Python

Hello everybody, I work at CERN where we use (py)spark and therefore py4j for our big data system

8/2/22

Hemant Kadam, Yitao Li3

5/31/22

How to pass Scala Option types from Python (Py4j) when calling Scala function?

Hey just for future reference for anyone running into this -- after thinking about this for long

unread,

How to pass Scala Option types from Python (Py4j) when calling Scala function?

Hey just for future reference for anyone running into this -- after thinking about this for long

5/31/22

5/16/22

[Help] License For Redistribution

I create also a new issue https://github.com/py4j/py4j/issues/483 在2022年5月17日星期二 UTC+8 10:43:38<

unread,

[Help] License For Redistribution

I create also a new issue https://github.com/py4j/py4j/issues/483 在2022年5月17日星期二 UTC+8 10:43:38<

5/16/22

Naz Alan, Jonah Graham2

4/6/22

Py4J on Eclipse

Hi Naz Please look at the Eclipse EASE project. It fully integrates py4j into Eclipse. https://www.

unread,

Py4J on Eclipse

Hi Naz Please look at the Eclipse EASE project. It fully integrates py4j into Eclipse. https://www.

4/6/22

Barthelemy Dagenais

11/20/21

Py4J has found a new maintainer team!

Hi everyone, Following my call for additional maintainers, Hyukjin Kwon from Databricks stepped up

unread,

Py4J has found a new maintainer team!

Hi everyone, Following my call for additional maintainers, Hyukjin Kwon from Databricks stepped up

11/20/21

Barthelemy Dagenais

11/20/21

Py4J 0.10.9.3 released

Py4J 0.10.9.3 has just been released on PyPI, Maven Central, and on Github (P2 repository) This is a

unread,

Py4J 0.10.9.3 released

Py4J 0.10.9.3 has just been released on PyPI, Maven Central, and on Github (P2 repository) This is a

11/20/21

Malik Jahanzeb, Dror Brill2

11/1/21

Memoryview data type

Hello, I would like to join in on this request. We are trying to incorporate Py4J in an enterprise

unread,

Memoryview data type

Hello, I would like to join in on this request. We are trying to incorporate Py4J in an enterprise

11/1/21

7/22/21

Python->Java call fails to return after Java process opens other port(s)

Problem solved, mea culpa. I had forgotten that Spring services are not necessarily singletons, and

unread,

Python->Java call fails to return after Java process opens other port(s)

Problem solved, mea culpa. I had forgotten that Spring services are not necessarily singletons, and

7/22/21

Aditya Singh, … Jonah Graham8

7/8/21

concurrent callbacks from java to python

Sounds good! BTW - A number of years ago we needed a new threading model and we paid the Py4J

unread,

concurrent callbacks from java to python

Sounds good! BTW - A number of years ago we needed a new threading model and we paid the Py4J

7/8/21

6/9/21

py4j-gevent breaks in Python 3

The problem is now solved, with the help of colleagues. The problem is that the program using gevent

unread,

py4j-gevent breaks in Python 3

The problem is now solved, with the help of colleagues. The problem is that the program using gevent

6/9/21

5/31/21

Accessing Python Code from Java

Hi, I have to perform matrix multiplication in python and input source is java code. Now I am using

unread,

Accessing Python Code from Java

Hi, I have to perform matrix multiplication in python and input source is java code. Now I am using

5/31/21

Devendra Dhole, Piotr Wittchen3

5/6/21

Can I access Image detection YOLOv4 Library in Java

Hi Piotr, Appreciate your response. Yes this library is something to do with Image detection through

unread,

Can I access Image detection YOLOv4 Library in Java

Hi Piotr, Appreciate your response. Yes this library is something to do with Image detection through

5/6/21

Ján Petrák, … Barthelemy Dagenais9

2/22/21

Connect multiple Python processes to one JVM?

I turned on logging, and the moment I attempt to connect from the second python process using the

unread,

Connect multiple Python processes to one JVM?

I turned on logging, and the moment I attempt to connect from the second python process using the

2/22/21

12/20/20

I am trying to run Py4j on linux based platform where JVM is not present. Is it possible to run? Or

unread,

I am trying to run Py4j on linux based platform where JVM is not present. Is it possible to run? Or

12/20/20

Search

Clear search

Close search

Google apps

Main menu