Fw: limits of java interoperability?

Okay, the issue demonstrated in testReturnString() comes because Jython returns strings as unicode-objects to Python. So I would consider it "okay" behavior, somewhat cumbersome though, since the method explicitly returns type "String". I guess this is the trade-off to pay for automatic type conversions...

However this does not explain the inner classes issue.

Gesendet: Sonntag, 19. Oktober 2014 um 02:08 Uhr

Von: "Stefan Richthofer" <[email protected]>

An: "Jython Developers" <[email protected]>

Betreff: limits of java interoperability?

Hello everybody,

it appears that Java interoperation does not work with inner classes or with objects created on java-side that were returned to Python. I find these limits quite disappointing and wonder if these are bugs or if I do something wrong. I assembled a trivial example to demonstrate these issues. Can you reproduce them? Are they well known limits or bugs?

------------(Java-file DemoClass.java)-----------------

import org.python.core.*;

public class DemoClass extends PyObject {

static class DemoInner {

public String demoMemberString = "inner member";

public int demoMemberInt = 42;

public void inner_test() {

System.out.println("inner_test!!");

}

}

public String demoMemberString = "member";

public int demoMemberInt = 4;

public void test() {

System.out.println("test!!");

}

public DemoInner makeInner() {

return new DemoInner();

}

public String makeString() {

return "test makeString";

}

public DemoClass makeDemo() {

DemoClass result = new DemoClass();

result.demoMemberInt = 25;

result.demoMemberString = "Java-created demo";

return result;

}

--------------demo jython script-----------------

def testReturnString():

dc = DemoClass()

print dc.demoMemberInt

print dc.demoMemberString

print dc.test()

dc2 = dc.makeDemo()

str = String("abcdef")

print str

print str.charAt(5) #works

str2 = dc.makeString()

print str2

print str2.charAt(5) #works not

def testInner():

dc = DemoClass()

print dc.demoMemberInt

print dc.demoMemberString

print dc.test() #works

dc2 = dc.makeDemo()

print dc2

print dc2.demoMemberInt

inner = dc.makeInner()

print inner

print inner.inner_test() #works not

print inner.demoMemberString #works not

if __name__ == '__main__':

import sys

from java.lang import String

sys.path.append('/home/stefan/eclipseWorkspace/JythonDemo-Java/bin')

import DemoClass

#select an issue to demonstrate:

#testReturnString()

testInner()

I scanned through the list of open issues, but could not find these. Please apologize if I overlooked something.

-Stefan

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