Cucumber-JVM is a pure Java implementation of Cucumber. You can run it with the tool of your choice.
Cucumber-JVM also integrates with all the popular Dependency Injection containers.
Migration instructions from previous major version and a long form explanation of noteworthy changes can be found in the release-notes archive
The changes for the current major version can be found in the CHANGELOG.md.
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You can register bugs and feature requests in the GitHub Issue Tracker.
Please bear in mind that this project is almost entirely developed by volunteers. If you do not provide the implementation yourself (or pay someone to do it for you), the bug might never get fixed. If it is a serious bug, other people than you might care enough to provide a fix.