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Top 7 Java immutable-collection Projects
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Javaslang
vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.
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SaaSHub
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Immutables
Java annotation processor to create immutable objects and builders, for records too. Sweep boilerplate code under the rug!
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Eclipse Collections
Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Java immutable-collections discussion
Java immutable-collections related posts
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what is the best persistent collection library?
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A benchmark to show you how fast my ORM framework is
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I ported my kotlin framework "kimmer" to java, named "jimmer"
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Is it possible to any jre under 16 to recognise class ver 60 ?
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Why doesn't Java support immutability directly in the core collection interfaces.
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Data-Oriented programming in Java
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Immutable/Persistent Collections for Java 3.2.1 features improved efficiency
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www.saashub.com | 22 Jun 2026
Index
What are some of the best open-source immutable-collection projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Javaslang | 6,150 |
| 2 | Immutables | 3,563 |
| 3 | Eclipse Collections | 2,632 |
| 4 | jimmer | 1,651 |
| 5 | Paguro | 323 |
| 6 | purefun | 139 |
| 7 | java-immutable-collections | 50 |