[armedbear-devel] expecting to find integer on stack

Alessio Stalla alessiostalla at gmail.com
Tue Apr 27 06:48:42 UTC 2010

On Tue, Apr 27, 2010 at 8:24 AM, Mark Evenson <evenson at panix.com> wrote:
> On 4/27/10 4:05 AM, Alan Ruttenberg wrote:
> […]
>> Now I'm getting used to the new pathname code and other changes.
>> 1) I used to use probe-file to test whether a thing was a file. Now,
>> however, probe-file on an http URI will return true. Is there a
>> recommended way to see whether a pathname is a file pathname?
> URL-PATHNAME and JAR-PATHNAME are now subtypes of PATHNAME, so the usual
> CL type machinery should be at your disposal.  For convenience, we have
> defined predicate functions EXT:PATHNAME-URL-P and EXT:PATHNAME-JAR-P
> which is what I would expect one for common usage.
>> 2) I use a different classloader (from bsh) so as to be able to add
>> jars to my classpath dynamically. However, if I wanted to specialize a
>> method on a java class so obtained, I need to coerce it to one that
>> clos knows about. I was using an internal call to do so:
>> (#"findJavaClass" 'org.armedbear.lisp.JavaClass class)
>> However this is gone in the new version. Could you suggest how I can
>> register a java class that I've obtained from the alternative class
>> manager so that clos knows about it?
> Hmmm, this should be unrelated to the URL pathname implementation.
> JavaObject.java seems to still have a findJavaClass() method, and even
> provides a Lisp interface JAVA::%FIND-JAVA-CLASS.  Maybe JSS is failing
> to properly invoke the method?
> In any case, we should figure out what functionality you need here, and
> polish this up as a semi-supported interface Lisp-side for usage.  The
> first step is figuring out where (and then why) we changed this.

IIRC, I should have a local patch to make JCLASS use another
classloader if you pass it to it, including in CLOS method
specializers, as in (defmethod foo ((x (jclass "foo"
*my-classloader*))) ...)

 If that sounds sensible to you, I can adapt it to the current version
of abcl and commit it, so it can be tested.


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