Evaluating Scheme from Java

[Mario Domenech Goulart <mario dot goulart at gmail dot com>]

Hi

I'm trying to evaluate Scheme code from Java.  The Java code
reads and evaluates the Scheme code which is in a file and calls
Java methods.  I'm getting the following error:

$ java -classpath .:api:kawa.jar SchemeLoader test.scm
Exception in thread "main" java.lang.Error: unknown code:f104
        at gnu.lists.TreeList.nextDataIndex(TreeList.java:2241)
        at gnu.mapping.Values.make(Values.java:82)
        at gnu.mapping.CallContext.getFromContext(CallContext.java:282)
        at gnu.expr.Language.eval(Language.java:821)
        at SchemeLoader.main(SchemeLoader.java:14)


Here's the layout of my code:

SchemeLoader
|-- Makefile
|-- SchemeLoader.java
|-- api
|   `-- Foo.java
|-- kawa.jar
`-- test.scm


The contents of the files are:

-------------[ SchemeLoader.java ]-------------
import java.io.*;
import kawa.standard.*;
import gnu.mapping.*;

class SchemeLoader {
    public static void main(String[] args) throws Throwable {
        Scheme.registerEnvironment();
        String filename = args[0];
        InPort freader = InPort.openFile(filename);
        Scheme scm = new Scheme();
        Object x = scm.eval(freader);
        System.out.println(x);
    }
}
----------[ end of SchemeLoader.java ]----------



---------------[ api/Foo.java ]-----------------
package api;

public class Foo {
    public static float add (float a, float b) {
        return (a + b);
    }
}
------------[ end of api/Foo.java ]--------------



-----------------[ test.scm ]-------------------
(api.Foo:add 4 4)
--------------[ end of test.scm ]---------------



-----------------[ Makefile ]--------------------
all:
        javac -classpath .:kawa.jar SchemeLoader.java
        javac -classpath .:api:kawa.jar api/Foo.java

clean:
        rm -f *~ *.class api/*~ api/*.class

run:
        java -classpath .:api:kawa.jar SchemeLoader test.scm
--------------[ end of Makefile ]-----------------


If I replace

   (api.Foo:add 4 4)

by

   (java.lang.Math:sqrt 9.0)

in test.scm, it works.

I get the error when running "make run" (after building the
source with "make").

Kawa version is 1.9.90 and Java is 1.6.0_20.

I'm afraid I'm terribly missing something.  I've placed a tarball
with the code above (and kawa.jar) at
http://parenteses.org/mario/misc/SchemeLoader.tar.gz

Any help is appreciated.

Best wishes.
Mario
-- 
http://parenteses.org/mario