[Jython-users] problem passing args to Java classes?

[John M. <joh...@ya...>]

Ugh!  I've been working all day translating some low level JPython
classes to Java.  I want to see how much it improves performance.

But I'm getting the following error when trying to use the Java classes
in JPython.  Here's a brief example in hope that someone will point out
my error.



$ cat Queue.java
public class Queue {
        int i;
        public Queue(int n) {
                super();

                this.i = n;
        }

        public void foo(int i, char c) {
                System.out.println("i=" + i + "  c=" + c);
        }
}

$ cat MsgQueue.java
import Queue;

public class MsgQueue {

        public MsgQueue(boolean qSize) {
                super();

                System.out.println("qSize=" + qSize);
        }

        public void  putMsg(Queue q) {

                synchronized (this) {
                        System.out.println("in synchronized putMsg");
                }
        }
}

$ CLASSPATH=$CLASSPATH:$(pwd)
$ javac Queue.java
$ javac MsgQueue.java

$ cat TestMsgQueue.py
#! /usr/bin/env jpython

import MsgQueue, Queue

class Test(MsgQueue):
        def __init__(self):
                MsgQueue.__init__(self, 0)

                startQ = Queue(10)
                print 'startQ=%s' % `startQ`
                print 'type(startQ)=%s' % `type(startQ)`

                self.putMsg(startQ)

t = Test()

$ TestMsgQueue.py
qSize=false
startQ=Queue@4fec48
type(startQ)=<jclass org.python.core.PyInstance at 6411754>
Traceback (innermost last):
  File "TestMsgQueue.py", line 15, in ?
  File "TestMsgQueue.py", line 13, in __init__
TypeError: putMsg(): 1st arg can't be coerced to Queue
$ 


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