public static Class<?> getInstrumenteeClass(
      String recordingClassName, String recordingMethodName, String targetClassName) {
    InstrumentingClassLoader loader =
        new InstrumentingClassLoader(
            recordingClassName,
            recordingMethodName,
            InstrumentingClassLoader.class.getClassLoader());

    return loader.findClass(targetClassName);
  }
Call this to get an instrumented version of Instrumentee.
src/test/java/com/google/monitoring/runtime/instrumentation/InstrumentingClassLoader.java