The Jack and Jill build system

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" summary

Google’s Jack and Jill replace javac+dx by having Jack compiles Java source straight to DEX while Jill converts library class files into a J format that Jack consumes; Jill conversion is slow on clean builds but cached so incremental builds speed up. Jack bundles ProGuard-like shrinking and gives about a ~10% bytecode speedup while full minification cuts the Google I/O APK from 3.1MB → 1.9MB. The J format is undocumented, and Java 8 default methods require Android 7.

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" chapters (10)

1. 0:00Introduction and background
2. 2:43What Jack and Jill are
3. 7:19Build process changes
4. 11:20Practical implications for developers
5. 16:39Java 8 features and ART runtime
6. 18:24Optimizations in Jack and Jill
7. 20:34Experimental results and app size
8. 24:49Bytecode performance impact
9. 26:18Conclusion and future outlook
10. 28:01Q&A session