Loading new class files when they are not available when the JVM starts

Question

Simple Question
Is it possible to load class if it was not compiled when the original JVM was launched?
More Detailed Question
Our build system is getting a slight tweak with a new test runner. After our build system compiles the file, I would like to be able to load the files that have just been compiled.
Our build system runs inside its own JVM and calls ant scripts to run the different processes(Separate JVM). The new test runner will also be called from the build system(Same JVM) but not as an ant target. Is it possible to call the newly compiled files from inside the build system JVM if they had not been created on the start of that JVM using reflection?
Thanks in Advanced!

Answer 1

public class t
    public static void main(String args[])
     throws Exception
     Writer out = new FileWriter("Foo.java");
     out.write("public class Foo implements Runnable {\n");
     out.write("    public void run() {\n");
     out.write("        System.out.println(\"run like the wind\");\n");
     out.write("    }\n");
     out.write("}\n");
     out.close();
     Runtime.getRuntime().exec("javac Foo.java").waitFor();
     ((Runnable) Class.forName("Foo").newInstance()).run();
}