source: branches/1.1.x/examples/jsr-223/JSR223Example.java

import javax.script.*;

public class JSR223Example {

  public static void main(String[] args) {
      //Script Engine instantiation using ServiceProvider - this will
      //look in the classpath for a file
      //  /META-INF/services/javax.script.ScriptEngineFactory
      //where the AbclScriptEngineFactory is registered
      ScriptEngine lispEngine = new ScriptEngineManager().getEngineByExtension("lisp");

      //Alternatively, you can directly instantiate the script engine:
      
      //ScriptEngineManager scriptManager = new ScriptEngineManager();
      //scriptManager.registerEngineExtension("lisp", new AbclScriptEngineFactory());
      //ScriptEngine lispEngine = scriptManager.getEngineByExtension("lisp");

      //(thanks to Peter Tsenter for suggesting this)
        
    //Accessing variables
    System.out.println();
    System.out.println("*package* = " + lispEngine.get("*package*"));
    Object someValue = new Object();
    lispEngine.put("someVariable", someValue);
    System.out.println("someVariable = " + lispEngine.get("someVariable"));
    try {
      //Interpretation (also from streams)
      lispEngine.eval("(defun hello (arg) (print (list arg someVariable)) (terpri))");
      
      //Direct function invocation
      ((Invocable) lispEngine).invokeFunction("hello", "world");
      
      //Implementing a Java interface in Lisp
      lispEngine.eval("(defun compare-to (&rest args) 42)");
      Comparable c = ((Invocable) lispEngine).getInterface(java.lang.Comparable.class);
      System.out.println("compareTo: " + c.compareTo(null));
      
      //Compilation!
      lispEngine.eval("(defmacro slow-compiling-macro (arg) (dotimes (i 1000000) (incf i)) `(print ,arg))");
      
      long millis = System.currentTimeMillis();
      lispEngine.eval("(slow-compiling-macro 42)");
      millis = System.currentTimeMillis() - millis;
      System.out.println("interpretation took " + millis);
      
      millis = System.currentTimeMillis();
      CompiledScript cs = ((Compilable) lispEngine).compile("(slow-compiling-macro 42)");
      millis = System.currentTimeMillis() - millis;
      System.out.println("compilation took " + millis);
      
      millis = System.currentTimeMillis();
      cs.eval();
      millis = System.currentTimeMillis() - millis;
      System.out.println("evaluation took " + millis);

      millis = System.currentTimeMillis();
      cs.eval();
      millis = System.currentTimeMillis() - millis;
      System.out.println("evaluation took " + millis);

      //Ecc. ecc.
    } catch (NoSuchMethodException e) {
      e.printStackTrace();
    } catch (ScriptException e) {
      e.printStackTrace();
    }
  }
  
}