How does the actual "repairing" part work? Looks like it relies on a few external libraries and also includes custom code for dealing with NullPointerExceptions

How does the actual "repairing" part work? Looks like it relies on a few external libraries and also includes custom code for dealing with NullPointerExceptions (which seem to be what was showcased here) - https://github.com/Spirals-Team/repairnator/tree/master/repairnator/repairnator-pipeline/src/main/java/fr/inria/spirals/repairnator/process/step/repair https://github.com/Spirals-Team/repairnator/tree/master/repa... - https://github.com/SpoonLabs/nopol https://github.com/SpoonLabs/nopol - https://github.com/SpoonLabs/astor https://github.com/SpoonLabs/astor