Problem accessing JVM class

[Henry Pinkard]

Hi, I'm trying to run some code from python accessing a JAR file with some a Java class that I wrote. I start the Java gateway like this:

classpath = '/path/to/jar/file.jar'

self.javagateway = JavaGateway.launch_gateway(classpath=cp, javaopts=['-Xmx4096m'], die_on_exit=True)

This works, and I can access standard Java classes within the JVM. However, I am unable to access the class within the jar.I get the following error:

TypeError: 'JavaPackage' object is not callable

As far as I can tell this means either py4j can't find the constructor I'm calling, or the JVM can't find it. Strangely, I can query the JVM for its classpath and my jar shows up. I do this using:

self.javagateway.jvm.java.net.URLClassLoader.getSystemClassLoader().getURLs()[1].getFile()

I'm doing this on an Ubuntu system, and I've gotten the same exact code to work on a different Ubuntu system, with same version of Java, python, py4j. I've now tried it on an additional Ubuntu system and run into the same problem. Does anyone have any suggestions for how I might be able to fix or debug this?

Henry

[Barthelemy Dagenais]

Hi,

thanks for using Py4J! From what I can see, you are correctly using the API. We would thus need a bit more information to help you.

Is the jar file readable from your user? The fact that you can see the file path in the system class loader is not enough: even if you provided a bad path, it would still show up.

Is the jar file compatible with the default JVM you are using?

Are you using the same Ubuntu version as before or is something different?

Can you provide a short code example that demonstrates where the TypeError occurs?

Thanks,

Bart

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