Re: [Py4j-users] Help Requested: error when accessing jvm for basic sample

[Barthelemy D. <ba...@cs...>]

Hi Sean,

this error means that the python interpreter cannot connect to the jvm
either because:

1- The jvm is not yet started so nothing is listening on the default py4j
port.

2- You have a firewall blocking the port.

You need to start the java program in the example and then, you can start
your python interpreter (not the other way around).

If you don't have a firewall and if you started the Java program before
running the interpreter, we will need more information to help you (e.g.,
how did you start the Java program, what is the output of the "netstat"
command in a command prompt after starting the Java program, etc.).

Barthélémy

On Mon, April 18, 2011 8:07 pm, Sean Silvestri wrote:
> HI All,
> I'm just getting started with Py4J, basically just trying to call a
> jar. I'm having trouble with the basic sample however:
>
>
>>>> from py4j.java_gateway import JavaGateway gateway = JavaGateway()
>>>> # connect to the JVM
>>>> random = gateway.jvm.java.util.Random()   # create a
>>>> java.util.Random instance number1 = random.nextInt(10)
>>>> # call the Random.nextInt method
>>>> number2 = random.nextInt(10) print(number1,number2)
> (2, 7)
>
>>>> addition_app = gateway.entry_point        # get the
>>>> AdditionApplication instance
>>>> addition_app.addition(number1,number2)    # call the addition method
>>>>
> 9
>
>
> I keep getting the following error: [Errno 10061] No connection could
> be made because the target machine actively refused it
>
> I'm on python 2.71 for windows i have jre6 se installed have set path.
> cheers, Sean
>
>
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