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Source++ is an open-source live coding platform. Add breakpoints, logs, metrics, and distributed tracing to live production software in real-time on-demand, right from your IDE or CLI.

Powered by Apache SkyWalking, Source++ enhances the software development experience with production debugging and development capabilities. Become a production-aware developer, understand code faster and deeper with developer-native observability technology, safely debug production applications with negligible to minimal overhead, and gain continuous insight into your application as it behaves in its natural environment.


  • Live Instruments
    • Live Breakpoints: Non-Breaking Breakpoints
    • Live Logs: Just-in-Time Logging
    • Live Metrics: Real-Time KPI Monitoring
    • Live Spans: User-Domain Tracing
  • Multi-instance debugging
  • Role-based access control
  • Instrument conditionals
  • Instrument TTL, sampling, rate limiting
  • Feedback whitelist/blacklist
  • PII redaction


Get Started

Compiling Project

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The Source++ documentation is available here.

Directory Structure

├── config              # Detekt, etc.
├── docker              # Docker setup files
    ├── e2e             # End-to-end testing environment
    ├── spp-oap-server  # SkyWalking OAP (incl. Source++ processor) image
    └── spp-platform    # Live coding server image
├── documentation       # Documentation
├── gradle              # Gradle wrapper
├── interfaces          # Live coding clients
    ├── cli             # Command-line interface
    └── marker          # IDE plugin
├── platform            # Live coding server
├── probe               # Live coding JVM agent
├── processor           # Live instrument processing
└── protocol            # Communication protocol


This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Please see the LICENSE file in our repository for the full text.