greenrobot/essentials

Health v2 · maintenance only

Adoption not part of the score

1349 stars · 188 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A lightweight collection of general-purpose utility classes for Java and Android, including primitive long-key hash collections, multimaps, an object cache, IO/file/string/date helpers, and a fast Murmur3 hash implementation. It aims to outperform standard Java APIs while staying under 100k in size.

Use cases

• use fast hash maps and sets with primitive long keys in Java
• get a Murmur3 hash implementation faster than the JDK's
• cache objects with weak/soft references and time-based expiration in Android
• store multiple values per key with a multimap
• read and write files and streams with less boilerplate
• split and join strings efficiently
• replace heavyweight dependencies like Guava with a tiny utility library

When to avoid

• you need the breadth of Guava or Apache Commons
• you need a framework rather than a small utility set
• you need actively maintained code with recent releases

Facets

library · maturity maintenance

caching serialization developer-tools developer-tools android-tools performance jvm java-utilities hash-functions primitive-collections murmur3 multimap object-cache io-utilities lightweight algorithms android

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