Re: [Jython-users] tojava() failing

[John G. <jgo...@co...>]

Tried, still didn't help..

Of note: when I print the loader of ListBO from within Python, it says
com.lutris.classloader.MultiClassLoader.  When I print the loader of
the superclass of ListBOFoo from within Java (that superclass is the
same ListBO), it says sun.misc.Launcher$AppClassLoader!  More and more
puzzling.  I feel that I'm SO CLOSE!

Also: I'm now pulling the *class* from python to Java, not an instance of it.
That seems to help, maybe...

-- John

Jeff Emanuel <je...@ad...> writes:

> I tried replicating what you are doing with a little stand-alone
> java program, but I can't seem to get the conversion to fail.
> 
> Here's another hack you could try.  Instead of passing the
> classloader to the script, pass the superclass.
> 
> 
> Java:I p
>     interp.set("ListBO", this.getClass());
> 
> Python:
> 
>     # Omit import, ListBO is in namespace from above.
> 
>     class ListBOFoo(ListBO):  # etc...
> 
> 
> John Goerzen wrote:
> 
> > Jeff Emanuel <je...@ad...> writes:
> >
> 
> >>This seems a little more familiar since you are loading the java
> >>class with a custom class loader.  When this has worked for me
> >>before, I have always used the system default class loader.
> >>
> > Oddly enough, I didn't even realize that class loaders even existed
> 
> > until your message yesterday, and certainly not that a non-default
> > loader was already being used.  Alas, I fear that I have no control
> > over what loader is being used at the moment.
> >
> 
> >>Try finding the classloader for the superclass, as jython sees it.
> >>Something like this:
> >>
> > I tried this, just from Python at the top of the module:
> 
> > print "Superclass loader: " +
> > ListBO.getClassLoader().getClass().getName()
> 
> > Prior to your suggested hack below, this printed out
> 
> > org.python.core.SyspathJavaLoader.
> >
> 
> >>I suspect that the jython super is not loaded by the same classloader and
> >>
> > This is true...
> 
> >
> 
> >>that is the root of your problems.  I'm not sure if there is a way to
> >>
> > ... but it doesn't seem to be the root of my problems.
> 
> >
> 
> >>You might be able to set your custom classloader in the interpreter's
> >>name space and rewrite your scripts to use that.  Something like this:
> >>
> > [ snip ]
> 
> > I had to hack it to get the variable into the module, but I got it to
> 
> > do that.
> >
> 
> >>   ListBO=classloader.loadClass("quovix.business.util.ListBO")
> >>
> > Now, the above print displays com.lutris.classloader.MultiClassLoader
> 
> > -- the same as for my code in static Java.  But -- I still get the
> > same ClassCastException in Java as before -- probably because the
> > ListBOFoo object is still being loaded by Python's loader (ByteLoader1).
> > -- John
> 
> > _______________________________________________
> 
> > Jython-users mailing list
> > Jyt...@li...
> > https://lists.sourceforge.net/lists/listinfo/jython-users
> >
> 
> 
> 

-- 
John Goerzen <jgo...@co...>    GPG: 0x8A1D9A1F    www.complete.org