for (Class<?> additionalClass : additionalClasses) {
builder.put(additionalClass.getName(), getByteCode(additionalClass));
}
// load classes into a private class loader
Map<String, Class<?>> isolatedClasses = dynamicClassLoader.defineClasses(builder.build());
Class<?> isolatedClass = isolatedClasses.get(implementationClass.getName());
// verify the isolated class
checkArgument(isolatedClass != null, "Could load class %s", implementationClass.getName());
checkArgument(publicBaseClass.isAssignableFrom(isolatedClass),