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Sosiefier is a project that aims at exploring the space of sosie of java programs. (Sosie means here a program variant that passes the original test suit.) It can be used to:

  • Explore java sources in order to build source transformations
  • Apply transformation and run tests in order to determine if the variant obtained is a sosie or not.
  • Chain these operations Project > Transformation exploration > apply transformation > build & run tests > results

Reference: "A Journey Among Java Neutral Program Variants", In Journal Genetic Programming and Evolvable Machines, Springer, 2019.

 title = {A Journey Among Java Neutral Program Variants},
 journal = {Journal Genetic Programming and Evolvable Machines, Springer},
 year = {2019},
 doi = {10.1007/s10710-019-09355-3},
 author = {Nicolas Harrand and Simon Allier and Marcelino Rodriguez-Cancio and Martin Monperrus and Benoit Baudry},
 url = {},


  • Transformation: Describe a source transformation.
  • Query: Explore a program to find transofrmations. (In order to test your query see generator/src/test/java/fr/inria/diversify/transformation/query/
  • Runner: Behavior to execute whith a set of transformations.
  • JSON input: Read a transformation from a json file

Configuration Files

See examples in ./configurationFiles

See also