java <sTring, address> map to python dictionary conversion using py4j

[pchari...@gmail.com]

we have a requirement to convert a map in java to dictionary in python using py4j. Map is of <String,Address> were Address is a object with houseNo, city, country are properties within it.
I was able to fetch the map and print them, but Address is coming as java object, need to know how shall i parse the above java object and get the values from it in python.

for key, value in address.items():
print (getattr(value, "houseNo"))

returns
<py4j.java_gateway.JavaMember object at 0x000001CBB904C320>
<py4j.java_gateway.JavaMember object at 0x000001CBB904C3C8>

But i need the actual object parameter "houseNo" : 41

is it possible with py4j?

[Jonah Graham]

Yes this is possible, have a look at https://www.py4j.org/faq.html#how-to-access-a-field and come back with any further questions if that is not working for you.

Jonah

~~~
Jonah Graham
Kichwa Coders Ltd.
www.kichwacoders.com

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[pchari...@gmail.com]

I am using the client server example that is being shared in the py4j site(i am new to this)

tried the below code to invoke gateway along with client server configuration:

from py4j.clientserver import ClientServer, JavaParameters, PythonParameters
from py4j.java_gateway import JavaGateway, GatewayParameters


class EclipseAction(object):
    """Simple implementation of an EclipseRunnable that opens
    a MessageDialog in the current thread. It must thus be
    called from a UI thread.
    """

    def __init__(self, clientserver):
        self.clientserver = clientserver

    def run(self, viewer):
       
        workspace_root = self.clientserver.jvm.org.eclipse.core.resources.ResourcesPlugin.getWorkspace().getRoot()
        project_names = [project.getName() for project in workspace_root.getProjects()]
        #print(project_names[0])
       
        addressDictionary = self.clientserver.jvm.xxx.accessAddressDetails(project_names[0])
        gateway = JavaGateway(gateway_parameters=GatewayParameters(auto_field=True))
        for key, value in addressDictionary.items():
            print(value.city)
            print(value.toString())
        #self.clientserver.jvm.org.eclipse.jface.dialogs.MessageDialog.openInformation(viewer.getControl().getShell(), "Sample View", "HELLO FROM PYTHON")


    class Java:
        implements = ["org.py4j.plugin_example.EclipseRunnable"]


action = EclipseAction(None)

clientServer = ClientServer(JavaParameters(), PythonParameters(), action)

# Small hack so that action can call Java
action.clientserver = clientServer

But the value.city didnt return the actual field value. it returns the <py4j.java_gateway.JavaMember object at 0x0000022DA8DF95F8>

Also, have a query,

With the example plugin, Shall i access the code in static method of a java code using python on the initial run without invoking the Sample View Action button? Could you please elaborate on steps.

[pchari...@gmail.com]

could anyone please assist on this.

[Barthelemy Dagenais]

Hi,

> But the value.city didnt return the actual field value. it returns the <py4j.java_gateway.JavaMember object at 0x0000022DA8DF95F8>

You are currently mixing a ClientServer and a JavaGateway. You should use only one (probably ClientServer in your case). You thus need:

clientServer = ClientServer(JavaParameters(auto_field=True), PythonParameters(), action)

> With the example plugin, Shall i access the code in static method of a java code using python on the initial run without invoking the Sample View Action button? Could you please elaborate on steps.

I don't understand this question. Can you ellaborate (your usage scenario, what you want to accomplish, which example plugin are you referring to?).

Bart

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