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takipi / java-bullshifier


An open source project by OverOps. Generate massive random Java applications with a command line tool



alt 'Java Bullishifier'

An open source project by OverOps.

Visit the site to download a sample result or read more on the blog


  • Groovy installed
  • Gradle installed
  • Java installed


  • Download, unzip, and you’re ready to go

Run settings

  • ./gradlew run (default parameters, generates one jar with 10 classes)
  • cd output && gradle fatJar to build the generated project
  • java -cp output/build/libs/tester.jar helpers.Main to run it

Or, you can simply run ./scripts/, or ./scripts/, with preconfigured run settings.


  • -Poutput-directory (relative path to output directory)
  • -Poutput-classes (number of classes to generate)
  • -Psubprojects (number of jars to generate)

Keep in mind that generating over 500 classes will take quite some time. Our biggest run had 20,000 classes, but it's better to keep this under 5,000.

Running sub projects

  • gradle build (get a WAR file)
  • Go to bin
  • A shell script is created per project, root will run them all

Advanced config

There are some additional options that give you fine grained control over the generated code, but might mess it up, use at your own risk:

  • Low level config: src/main/groovy/generator/Config.groovy
  • Higher level config is available in the output folder. There are more options to add logging, and fine tune the behavior of the application but it’s experimental at the moment.

If you’d like to learn more, feel free to reach out for a deeper walkthrough ( Default settings are no logs, and an exception on every 10th frame in the call stack.