Java adding a programmatically compiled class to the current Class's list of available references

As an extension of Java ClassNotFoundException when reading object from a stream

I have added the ability for the server to recieve the .java file, and it can compile it. However, I am still getting the same ClassNotFoundException. How can I make the server see and use the class it compiled to read the object from the objectInputStream?

Code to read and compile the .java on the serverSide:

    private void doNewWorkUnitDefinition(Object object) {
    NewWorkUnitDefinition newWorkUnitDefinition = (NewWorkUnitDefinition)object;
    byte[] bytes = newWorkUnitDefinition.getBytes();
    String name = newWorkUnitDefinition.getName();

    if (isClient) 
        client.gotNewWorkUnitDefinition(bytes, name);
    else {
        String executionPath = System.getProperty("user.dir");
        File file = new File(executionPath, name);
        try {
            FileOutputStream fileOut = new FileOutputStream(file);
            fileOut.write(bytes);
            fileOut.close();
            System.out.println("Just wrote a file to: " + file.getAbsolutePath());

            JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
            compiler.run(System.in, System.out, System.err, file.getAbsolutePath());

            ClassLoader cl_old = Thread.currentThread().getContextClassLoader();
            ClassLoader cl_new = new URLClassLoader(new URL[] { file
                    .getParentFile().toURI().toURL() }, cl_old);
            System.out.println("WorkUnitFile: " + file.getAbsolutePath());
            Class compiledClass = cl_new.loadClass(file.getName()
                    .replace(".java", ""));
            this.

            sendConfirmDefinitionReceipt();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}