Problem with define-java-proxy

Hi,

I've just started experimenting with the Scheme<->Java interface (s2j) 
using SISC 1.13.6. I did the following:

(import s2j)
(define-java-class <java.lang.runnable>)
(define-java-proxy (runnable thunk)
  (<java.lang.runnable>)
  (define run
    (lambda ()
      (thunk)
      (void))))

(define-generic-java-methods run)

When I evaluate the expression:

(run (runnable (lambda () (display "Hi!") (newline))))

I get the following error:

Error: #<java java.lang.reflect.UndeclaredThrowableException 
java.lang.reflect.UndeclaredThrowableException>
?:?:?: <from call to @s2j-operation::java/invoke-method>

I tried the example in the documentation (with a Comparator), and it 
works fine.

Any idea?

Thanks in advance,

Dominique


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