py4j

Import java package com.typesafe.config.impl.SimpleConfig using python with py4j Question: I can import all from java.* using the jvm from JavaGateway of py4j for example: jvm.java.util.ArrayList jvm.java.lang.System random = jvm.java.util.Random() random.nextInt(3) or in this form: from py4j.java_gateway import java_import java_import(jvm,’java.util.*’) random = jvm.Random() random.nextInt(3) I need to import: com.typesafe.config.impl.SimpleConfig com.typesafe.config.ConfigFactory com.typesafe.config.Config But it doesn’t work, I …

Connecting and testing a JDBC driver from Python Question: I’m trying to do some testing on our JDBC driver using Python. Initially figuring out JPype, I eventually managed to connect the driver and execute select queries like so (reproducing a generalized snippet): from __future__ import print_function from jpype import * #Start JVM, attach the driver …

How to add third-party Java JAR files for use in PySpark Question: I have some third-party database client libraries in Java. I want to access them through java_gateway.py E.g.: to make the client class (not a JDBC driver!) available to the Python client via the Java gateway: java_import(gateway.jvm, "org.mydatabase.MyDBClient") It is not clear where to …

PY4J callback server error Question: I’m trying to run the example for the callback server in the PY4J website here But I’m getting the following exception: “py4j.protocol.Py4JNetworkError: An error occurred while trying to start the callback server” This is the code: Java: package py4j.examples; import java.util.ArrayList; import java.util.List; import java.util.Random; import py4j.GatewayServer; public class OperatorExample …