Re: [Jython-users] tojava() failing

[Jeff E. <je...@ad...>]

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:
    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
> 
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