#75 Python crashes when trying to change a Java class variable.

[Anonymous]

Python crashes when I try to change the class variable 'i' in Test
The class below is the culprit, I really don't get it why something this simple would cause Python to crash :s
Could anyone help me out here? Thanks in advance.

package py;

public class Test {
int i;
public void doTest() {
this.i = 5;
}
}

[Steve Menard]

Can you provide more details? IN aprticular the python code and the crash (stack trace, if any).

[Nobody/Anonymous]

Thanks for the quick response,

Well, the python process just terminates after calling Test.doTest(), wich is supposed to change the variable 'i' to 5 in Class Test.
The python code im trying to run is:

from jpype import *

JVM_DIR = "C:/Program Files/Java/jdk1.6.0_20/jre/bin/client/jvm.dll"
JVM = None
py = JPackage('py')
test = py.Test()
startJVM()
test.doTest()

def startJVM(self):
print "JVM started"
self.JVM = startJVM(self.JVM_DIR, "-Djava.class.path=./;./py/")

def closeJVM(self):
print "closing JVM"
self.JVM.shutdownJVM()

[Nobody/Anonymous]

I believe I've discovered the problem. I didn't instantiate the python Test class, though I dont understand why it didnt print a stacktrace.

Thanks again,
Roy.

[Steve Menard]

There is another problem. You can't lookup the class before you start the JVM

try this :

VM_DIR = "C:/Program Files/Java/jdk1.6.0_20/jre/bin/client/jvm.dll"
JVM = None
py = JPackage('py')
startJVM()
test = py.Test()
test().doTest()