Re: [Jython-users] classloader funkiness when inheriting from java interfaces

[Samuele P. <pe...@in...>]

Hi. It was a bug, now it's fixed in the CVS.
Starting with jython 2.0 inheriting from java
classes from 3rd-party classloaders is supported
by design but has not really been stressed ;).

Patch:
Index: MakeProxies.java
===================================================================
RCS file: /cvsroot/jython/jython/org/python/core/MakeProxies.java,v
retrieving revision 2.16
retrieving revision 2.17
diff -C2 -d -r2.16 -r2.17
*** MakeProxies.java 2001/02/14 22:17:54 2.16
--- MakeProxies.java 2001/10/19 00:16:45 2.17
***************
*** 22,27 ****
              if (referent != null) {
                  secondary.insertElementAt(referent,0);
-                 referents = secondary;
              }
          } else {
              if (referent != null) {
--- 22,27 ----
              if (referent != null) {
                  secondary.insertElementAt(referent,0);
              }
+             referents = secondary;
          } else {
              if (referent != null) {

otherwise Workaround:

class Foo(java.lang.Object, Java3rdPClassLoaderInterface): pass
                ^
regards, Samuele Pedroni.

----- Original Message -----
From: <Mat...@i2...>
To: <jyt...@li...>
Sent: Friday, October 19, 2001 12:01 AM
Subject: [Jython-users] classloader funkiness when inheriting from java
interfaces


> I can use a custom classloader to load a Java class using a classpath
> other than that given jython at startup.  I can then define a new jython
> class deriving from that Java class, and use it without any problems.
> However, if I try and do the same thing with a Java exception, I get a
> java.lang.NoClassDefFoundError exception.  Anyone know why this is, or if
> there is a workaround?  I've provided an example below, just sub in values
> for classpath/classname and you will only see the error when classname is
> a java interface.
>
> from java.io import *
> from java.net import *
> from jarray import *
>
> # some.jar not in jython startup classpath
> classpath = ["some.jar"]
> classname = "some.class.in.some.jar"
>
> urls = array([File(each).toURL() for each in classpath], URL)
> classLoader = URLClassLoader(urls)
> javaClass = classLoader.loadClass(classname)
>
> class Foo(javaClass):
>     pass
>
> f = Foo()
>
> Any help appreciated, thanks,
>
> Matt
> mat...@i2...
>
>
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