Java HTML Other
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.

Build Status

🍈 Cantaloupe

High-performance dynamic image server in Java


Get started with a release build.


Build & run

Command line

  • mvn exec:java -Dcantaloupe.config=... will build the project and run in standalone mode, using the embedded Servlet container listening on the port(s) specified in
  • mvn clean package -DskipTests will build a release WAR in the target folder, which can be run like any other.


There are a few ways to do this. The simplest is probably:

  1. Add a new run configuration using the "Java Application" template or its equivalent.

  2. Set the main class to edu.illinois.library.cantaloupe.StandaloneEntry and add the -Dcantaloupe.config=... VM option.

  3. Set the run configuration to include dependencies with provided scope. (IntelliJ has a checkbox for this.) Alternatively, download servlet-api-3.1.jar and add it to your classpath: --class-path=/path/to/servlet-api-3.1.jar

    Or, in Java 9+, your module path: --module-path=/path/to/containing/dir


For testing, copy to and fill in whatever info you have.

The tests are structured into four profiles:

1. Tests with no dependencies

mvn clean test -Pnodeps will run only the tests that have no dependencies on third-party services and do not require any exteral tools or libraries.

2. Tests with free dependencies

mvn clean test -Pfreedeps will run all of the above tests, plus any that depend on open-source tools or libraries. These are the tests run in continuous integration. The following dependencies are required:

  • FFmpeg (for FfmpegProcessorTest)
  • GraphicsMagick (for GraphicsMagickProcessorTest)
  • ImageMagick (for ImageMagickProcessorTest)
  • OpenJPEG (for OpenJpegProcessorTest)
  • Redis (for RedisCacheTest)

3. All tests

mvn clean test will run all tests, including the ones above. The following dependencies are required in addition to the ones above:

  • Kakadu demo tools (for KakaduDemoProcessorTest) - see the KakaduDemoProcessor section of the user manual for information about these.
  • Kakadu native library (for KakaduNativeProcessorTest) - see the KakaduNativeProcessor section of the user manual for information.
  • A Microsoft Azure account

4. Performance tests

Performance tests use JMH. Run them with mvn clean test -Pbenchmark.

5. Output tests

There is an output tester tool that enables visual inspection of image output.

Build the website

The website is built using Jekyll. With that installed, run jekyll serve from the website directory. Then, open http://localhost:4000/cantaloupe/ in a web browser.

An effort is made to keep the website in sync with development on the same branch. The "Upgrading" and "Change Log" sections of the website are usually current.


Contributions are welcome. The suggested process for contributing code changes is:

  1. Submit a "heads-up" issue in the tracker, ideally before beginning any work.
  2. Create a fork.
  3. Create a feature branch, starting from either release/x.x or develop (see the "Versioning" section.)
  4. Make your changes.
  5. Commit your changes (git commit -am 'Add some feature').
  6. Push the branch (git push origin feature/my-new-feature).
  7. Create a pull request.

Other Notes

Configuration keys

Different application versions may require different configuration file keys. It's good practice to use a dedicated configuration file for each version. Keys are documented on the website through the latest release. If you are using a newer build, like a snapshot from the develop branch, newer keys will be documented in website/upgrade.html.


Cantaloupe roughly uses semantic versioning. Major releases (n) involve major rearchitecting that breaks backwards compatibility in a significant way. Minor releases (n.n) either do not break compatibility, or only in a minor way. Patch releases (n.n.n) are for bugfixes only.


Cantaloupe uses the Gitflow branching model. develop is the main branch that tracks the current state of the next non-bugfix release. Significant features branch off of that into feature branches (feature/feature-name), from which they can be integrated into a particular release.

When a major or minor version is ready for release in develop, it branches off into a release/n.n branch, where its version is set. Finally, that is merged into master, where the release is tagged and the release archive is created.

Bugfixes that would increment a minor version of a release are applied to the release branch for that release, and merged back into develop.


  1. Run the Maven Verifier plugin (mvn verify -DskipTests=true)
  2. Run an OWASP dependency check (mvn org.owasp:dependency-check-maven:check)
  3. Run Findbugs (mvn clean compile findbugs:findbugs findbugs:gui)
  4. Run the tests:
    • JUnit
    • Endpoint tests
  5. Finalize the code to be released, addressing any relevant milestone issues, TODOs, etc.
  6. Finalize the documentation, including the website, user manual, and change log


  1. Merge into release/vX.X
  2. Update the version in pom.xml and commit this change
  3. Merge into master
  4. Create the release .zip archive with mvn clean package -DskipTests
  5. Verify that the .zip archive is as expected
  6. Push the code: git push origin master; git push origin release/x.x
  7. Wait for CI tests to pass
  8. Tag the release: git tag -a v{version} -m 'Tag v{version}'
  9. git push --tags
  10. Add the .zip archive and change log info to the release tag on GitHub
  11. Deploy the updated website using build/deploy_website.rb
  12. Append -SNAPSHOT to the version in pom.xml and commit this change
  13. Close the release's GitHub milestone


Cantaloupe is open-source software distributed under the University of Illinois/NCSA Open Source License; see the file LICENSE.txt for terms.