sbt Sample Caching Issues

A collection of self-contained sbt projects, each demonstrating a specific build cache issue that can be diagnosed using the Develocity sbt plugin's verbose cache logging.

Samples

Sample	Cache issue	Affected task
volatile-source-input/	Generated source with timestamp changes compile cache key every build	Compile / compile
volatile-test-config/	Volatile JVM option injected into forked test process changes test cache key every session	Test / test
require-clean-violation/	Incremental compilation state prevents cache storage when requireClean is true (the default)	Compile / compile

Each sample includes a README with the problem description, reproduction steps, diagnosis workflow, and fix.

Prerequisites

• sbt
• JDK 21+

Verbose Cache Logging

All samples are designed to be diagnosed with verbose cache logging enabled:

cd <sample-dir>
sbt -Ddevelocity.internal.cache.verbose=true \
    -Ddevelocity.internal.cache.defaultLogLevel=info \
    'clean; compile'

License

This project is open-source software released under the Apache 2.0 License.