Don Raab

Java Champion. Creator of the Eclipse Collections OSS Java library. Inspired by Smalltalk. Opinions are my own.

Jakarta EE 11: Beyond the Era of Java EE

This user guide provides a brief history of Java EE/Jakarta EE and a detailed overview of some of the specifications that will be updated in Jakarta EE 11.

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Immutable Collections in Java with Sealed Types

JDK 15 was released on September 15, 2020. JEP 360 Sealed Types was included as a preview feature in this release, with its second preview in JDK 16. Sealed Types is part of Project Amber. Sealed classes or interfaces can be used to restrict the interfaces or classes that are allowed to extend them. Also learn about the source code for an experimental implementation of a collections framework can be found in the Deck of Cards Kata repo.

Dec 10 6,2K

Don Raab

Sealed Classes

Tutorials

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08:45 PM · February 09, 2026

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