Apache - Java ClassLoader problem

Nedenstående java kode fungerer fint når det afvikles inde i eclipse. Der oprettes en klasse i memory som efterfølgende kompileres og der kaldes en metode.

Der opstår til gengæld et problem når jeg kører klassen i Tomcat (WEB-INF/pkkcms_lib). Java version i apache sat til jdk1.6.0_010.

Følgende fremgår af apache's consol:

compile-status:true
NullPointerException
      at SpecialClassLoader.findClass(JC16.java:195)
      at java.lang.classLoader.loadClass(ClassLoader.java:307)
      ...
      ...

- Det ser ud til at klassen kompileres fint. Problemet opstår efterfølgende i linjen "Class<?> c = Class.forName("content", false, xcl);".


---------------------------------------------------------------


import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;

import java.net.URI;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.io.*;

import javax.tools.Diagnostic;
import javax.tools.DiagnosticCollector;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import javax.tools.JavaCompiler.CompilationTask;

public class JC16x {


    public static void testMemoryMemory() throws Exception {
        //String cx=ReadTextFile.readTextFile(new File("C:/Program Files/Apache Software Foundation/Tomcat 5.5/webapps/pkkcms/WEB-INF/pkkcms_lib/content.java"),"cp1252").toString();
       
        // denne tekstfil skal senere nedlægges og kun oprettes som streng.
        String cx=ReadTextFile.readTextFile(new File("C:/dmi/java2/pkkcms_268/content.java"),"cp1252").toString();
        String src = cx;
        SpecialClassLoader xcl = new SpecialClassLoader();
        compileMemoryMemory(src, "content", xcl, System.err);
        Class<?> c = Class.forName("content", false, xcl);
        Object o = c.newInstance();
        c.getMethod("content", new Class[] {}).invoke(o, new Object[] { });

    }
    public static void compileMemoryMemory(String src, String name, SpecialClassLoader xcl, PrintStream err) {
        JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
        DiagnosticCollector<JavaFileObject> diacol = new DiagnosticCollector<JavaFileObject>();
        StandardJavaFileManager sjfm = javac.getStandardFileManager(diacol, null, null);
        SpecialJavaFileManager xfm = new SpecialJavaFileManager(sjfm, xcl);
        //CompilationTask compile = javac.getTask(null, xfm, diacol, Arrays.asList(new String[] {"-classpath", "C:/Program Files/Apache Software Foundation/Tomcat 5.5/webapps/pkkcms/WEB-INF/pkkcms_lib"}), null,
        //                                        Arrays.asList(new JavaFileObject[] { new MemorySource(name, src) }));
        CompilationTask compile = javac.getTask(null, xfm, diacol, Arrays.asList(new String[] {"-classpath", "C:/dmi/java2/pkkcms_268/"}), null,
                Arrays.asList(new JavaFileObject[] { new MemorySource(name, src) }));
        boolean status = compile.call();
        if(err != null) {
            err.println("Compile status: " + status);
            for(Diagnostic<? extends JavaFileObject> dia : diacol.getDiagnostics()) {
                err.println(dia);
            }
        }
    }
}

class MemorySource extends SimpleJavaFileObject {
    private String src;
    public MemorySource(String name, String src) {
        super(URI.create("string:///" + name + ".java"), Kind.SOURCE);
        this.src = src;
    }
    public CharSequence getCharContent(boolean ignoreEncodingErrors) {
        return src;
    }
    public OutputStream openOutputStream() {
        throw new IllegalStateException();
    }
    public InputStream openInputStream() {
        return new ByteArrayInputStream(src.getBytes());
    }
}

class MemoryByteCode extends SimpleJavaFileObject {
    private ByteArrayOutputStream baos;
    public MemoryByteCode(String name) {
        super(URI.create("byte:///" + name + ".class"), Kind.CLASS);
    }
    public CharSequence getCharContent(boolean ignoreEncodingErrors) {
        throw new IllegalStateException();
    }
    public OutputStream openOutputStream() {
        baos = new ByteArrayOutputStream();
        return baos;
    }
    public InputStream openInputStream() {
        throw new IllegalStateException();
    }
    public byte[] getBytes() {
        return baos.toByteArray();
    }
}

class SpecialJavaFileManager extends ForwardingJavaFileManager<StandardJavaFileManager> {
    private SpecialClassLoader xcl;
    public SpecialJavaFileManager(StandardJavaFileManager sjfm, SpecialClassLoader xcl) {
        super(sjfm);
        this.xcl = xcl;
    }
    public JavaFileObject getJavaFileForOutput(Location location, String name, JavaFileObject.Kind kind, FileObject sibling) throws IOException {
        MemoryByteCode mbc = new MemoryByteCode(name);
        xcl.addClass(name, mbc);
        return mbc;
    }
}

class SpecialClassLoader extends ClassLoader {
    private Map<String,MemoryByteCode> m;
    public SpecialClassLoader() {
        m = new HashMap<String, MemoryByteCode>();
    }
    protected Class<?> findClass(String name) {


        MemoryByteCode mbc = m.get(name);
        return defineClass(name, mbc.getBytes(), 0, mbc.getBytes().length);
    }
    public void addClass(String name, MemoryByteCode mbc) {
        m.put(name, mbc);
    }
}