Which one should I pick for a new project?

I need to be direct: neither repository is a good fit for a new project based on the available signals.

crossoverjie/jcsprout:

• Status: Stale — Last commit was 2 years ago (per RepoPilot analysis)
• This is a learning/educational resource, not a production library. It's a collection of Java core knowledge examples (collections, threading, design patterns, algorithms)
• Best used as a study reference, not as a dependency

karumi/dexter:

• Status: Abandoned — The README explicitly states: "This project is no longer under active development" [README.md:L1-L20]
• It's an Android permissions library from ~2015, predating modern Android permission handling practices
• For actual Android projects needing runtime permissions, the README directs you elsewhere: "If you are looking for an Android library to be able to request Android permissions in runtime take a look here" [README.md:L1-L20]

Recommendation:

• If you're learning Java core concepts (threading, collections, design patterns), study jcsprout's examples but don't depend on it
• If you're building an Android app, use modern permission libraries recommended on Android Arsenal—not Dexter
• For any production project, choose actively maintained libraries with recent commits and clear support

What kind of project are you building? That would help me suggest better alternatives.

FOLLOW_UPS:

• What is your project's primary technology stack?
• Are you building Android, backend, or general Java?
• What specific problem are you trying to solve?