Cannot clean up Evaluator.java code - errors involving javax.tools.*

[CODE]
/*
 * Evaluator.java
 *
 * Created on January 23, 2007, 4:17 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package ObjectTools;

import java.io.*;
import java.net.*;
import javax.tools.*;
import java.lang.reflect.*;

/**
 * Utilizes {@link java.lang.reflect} package
 *
 * @author ppowell-c
 */
public abstract class Evaluator {

    public static boolean writeSource(final String sourcePath, final
String sourceCode)
    throws FileNotFoundException {
        PrintWriter writer = new PrintWriter(sourcePath);
        writer.println(sourceCode);
        writer.close();
        return true;
    }

    public static boolean compile(final String sourcePath) throws
IOException {
        final JavaCompilerTool compiler =
ToolProvider.defaultJavaCompiler();
        final JavaFileManager manager =
compiler.getStandardFileManager();
        final JavaFileObject source =
                manager.getFileForInput(sourcePath); /*
java.io.IOException */
        final JavaCompilerTool.CompilationTask task =
compiler.run(null, source);
        return task.getResult();
    }

    public static final java.lang.Class loadExpression(final String
path, final String className)
    throws MalformedURLException,
            ClassNotFoundException { /* java.net.MalformedURLException
*/
        final URLClassLoader myLoader = new URLClassLoader(new
java.net.URL[] {
            new File(path).toURI().toURL()
        });
        /* java.lang.ClassNotFoundException */
        return Class.forName(className, true, myLoader);
    }

    public static java.lang.Object evalExpression(final Class test)
    throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException {
        final Class[] parameterType = null;
        /* java.lang.NoSuchMethodException */
        final Method method = test.getMethod("expression",
parameterType);
        final Object[] argument = null;
        Object instance = null;
        /* java.lang.IllegalAccessException,
java.lang.reflect.InvocationTargetException */
        return method.invoke(instance, argument);
    }

    public static Object eval(final String expression)
    throws FileNotFoundException, IOException, MalformedURLException,
            ClassNotFoundException, NoSuchMethodException,
IllegalAccessException,
            InvocationTargetException {
        final Object result;
        final String path = "c:/";
        final String className = "ExpressionWrapper";
        final String sourcePath = path + className + ".java";
        writeSource(/* to */ sourcePath,
                "public class " + className + "\n" +
                "{ public static java.lang.Object expression()\n" +
                " { return " + expression + "; }}\n" );
        if(compile(sourcePath)) {
            final Class class_ =
                    loadExpression(/* from */ path, className);
            result = evalExpression(class_);
        } else {
            result = null;
        }
        return result;
    }
}

[/CODE]

Produces compiler errors on javax.tools.ToolProvider along with nearly
everything else in javax.tools to boot.

I'm using J2SE 1.5.0 with NetBeans 5.5 so they all should be there.
I'm following the example at
[URL=http://userpage.fu-berlin.de/~ram/pub/pub_jf47ht9Ht/evaluating-expressions-with-java]eval
for Java example[/url] since all I want to do is come up with a Java
equivalent of "eval()", which I use in PHP whenever I need it.

Help appreciated, I'm lost here.

Thanx
Phil