There are frameworks that support this kind of evolution, e.g. Kryo can do graph->graph transformations without intermediate serialisation I believe. Or you cou

There are frameworks that support this kind of evolution, e.g. Kryo can do graph->graph transformations without intermediate serialisation I believe. Or you could write it by hand. If the static typing gets in the way you can always just use a scripting language to do it, many run on the JVM.