Re: some questions using callbacks to java

["Paul R. Potts" <potts at umich dot edu>]

>> <string>:1:332: warning - no method `print' in java.lang.Object
>> <string>:1:381: warning - no method `test_bind' in java.lang.Object
>> <string>:1:427: warning - no method `print' in java.lang.Object
>> 
>> is there a way to avoid these warnings going to stdout?
> 
> I could disable these warning with some switch, I suppose.  However, the
> warning means that the compiler is forced to generate code to look up
> the method at run-time.  I haven't timed it, but I would not be surprised
> is doing that is *100 times* slower than if the compiler can find the
> method.
> 
> The prferred ay to avoid the warnings is to use declarations, assuming
> debug-callbacks etc are lexicall bound.  If not you can put in an
> explicit cast:

per, can you give me an example of declaring these? also, i am not sure what
you mean by lexically bound. after executing the environment . put on these
objects in the java side, they are bindings available in kawa, do you mean
something else?

> (invoke (as <java.util.Date> my-date) 'setDate cur-date)
> 
> I don't know how well this would work with inner classes.

i think you're right since inner classes are basically a name-mangling hack,
so i took them out; i had just put them there for reading convenience, they
were not really needing to access outer class members.

>> the first callback works, then the test_bind fires. it appears to execute
>> ok, but then when executing the next callback i get
>> 
>> Unbound Symbol exception: Unbound symbol patient
> 
> "patient" does not evaluate to a Java String - it's a Scheme string.
> Use 'patient instead.

thanks, this fixed that problem. not sure why doing the put() on a string
rather than symbol failed silently w/o generating a runtime exception

thanks, p

--
Paul R. Potts * Technology Group Leader * Health Media Research Lab
Comprehensive Cancer Center * University of Michigan Medical Center
734.936.0096 * potts@umich.edu

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