[armedbear-devel] java/abcl hello-world example
alessiostalla at gmail.com
Sun Aug 22 09:19:18 UTC 2010
On Sun, Aug 22, 2010 at 1:15 AM, David Dreisigmeyer
<david.dreisigmeyer at gmail.com> wrote:
> Hi Robert,
> I did see that (thanks for the link). This example is included with
> the source code for abcl also (in examples/lisp-to-java). I guess
> what I'd need help with is how to to make a jar file from the
> Main.java from examples/lisp-to-java (see below) file and then use
> that from abcl.
> Thanks again, I really appreciate it,
> import org.armedbear.lisp.*;
> public class Main
> * This example creates an Interpreter instance, loads our
> * lisp code from a file and then looks up a function defined
> * in the loaded lisp file and executes the function.
> * The function takes a single parameter and invokes a java method
> * on the object provided. We provide our Main object as the parameter.
> public static void main(String argv)
> Main thisObject = new Main();
> Interpreter interpreter = Interpreter.createInstance();
> interpreter.eval("(load \"lispfunctions.lisp\")");
> // the function is not in a separate package, thus the
> // correct package is CL-USER. Symbol names are
> // upper case. Package needs the prefix, because java
> // also has a class named Package.
> org.armedbear.lisp.Package defaultPackage =
> Symbol voidsym =
> Function voidFunction = (Function) voidsym.getSymbolFunction();
> voidFunction.execute(new JavaObject(thisObject));
> catch (Throwable t)
> public int addTwoNumbers(int a, int b)
> return a + b;
That's independent from ABCL; it's the same as for any Java library.
You need to compile the java file(s) with javac, with the libraries
you need (ABCL included) on the classpath, then if you want a jar, run
the jar program on the generated .class files; it has a command like
syntax inspired by tar. In your case, that means something like
javac -cp .:/path/to/abcl.jar your-java-files
jar cvf foo.jar .
assuming you're in a Unix-like environment and . is the source code
root of your project.
For more complex scenarios - projects consisting of many files and
depending on many libraries - you'll be better off using an IDE like
Eclipse or a build tool like Ant.
To use your jar with ABCL, include it in the classpath:
java -cp /path/to/abcl.jar:/path/to/your.jar org.armedbear.lisp.Main
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