Duke on CRaC with Jakarta EE

Have you heard of Coordinated Restore at Checkpoint (CRaC)? The short version is that it is a super fast way to start your Java applications. Did you know that you can do that with Jakarta EE as well?

Join us in this session and follow Duke’s adventures of building modern and quick Jakarta EE applications with even faster start-up time. You will learn the basics of CRaC as well as gain an understanding of why it is a particularly good fit for Jakarta EE.

Transcript

1. Duke on CRaC with Jakarta EE Ivar Grimstad
 Jakarta EE Developer Advocate Rustam Mehmandarov
 Senior Software Engineer
2. https://github.com/ivargrimstad https://www.linkedin.com/in/ivargrimstad @ivar_grimstad@mastadon.social ivargrimstad_of fi cial @ivar_grimstad https://www.threads.net/@ivargrimstad_of fi cial @ivargrimstad.bsky.social
3. https://github.com/mehmandarov https://www.linkedin.com/in/mehmandarov @mehmandarov@mastadon.social @rmehmandarov @rustam.no https://rustam.no
4. COPYRIGHT (C) 2022, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Jakarta EE
5. 2004 2024 1995 1999 2006 2017 2020 javax.* -> jakarta.* 2014 JSR 330 2009
6. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Speci fi cation Document API TCK Final Speci fi cation Compatible Implementation(s) Speci fi
9. COPYRIGHT (C) 2022, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Jakarta EE 11
10. RESTful Web Services 4.0 JSON Processing 2.1 JSON Binding 3.0 Annotations 3.0 CDI Lite 4.1 Interceptors 2.2 Dependency Injection 2.0 Servlet 6.1 Pages 4.0 Expression Language 6.0 Debugging Support 2.0 Standard Tag Libraries 3.0 Faces 4.1 WebSocket 2.2 Enterprise Beans Lite 4.0 Persistence 3.2 Transactions 2.0 CDI 4.1 Authentication 3.1 Concurrency 3.1 Security 4.0 Validation 3.1 Data 1.0 Authorization 3.0 Activation 2.1 Batch 2.1 Connectors 2.1 Mail 2.1 Messaging 3.1 Enterprise Beans 4.0 Jakarta EE 11 Platform Jakarta EE 11 Web Pro fi Updated Not Updated New
11. Jakarta EE 11 Web Pro fi le RESTful Web Services 4.0 JSON Processing 2.1 JSON Binding 3.0 Annotations 3.0 CDI Lite 4.1 Interceptors 2.2 Dependency Injection 2.0 Servlet 6.1 Pages 4.0 Expression Language 6.0 Debugging Support 2.0 Standard Tag Libraries 3.0 Faces 4.1 WebSocket 2.2 Enterprise Beans Lite 4.0 Persistence 3.2 Transactions 2.0 CDI 4.1 Authentication 3.1 Concurrency 3.1 Security 4.0 Validation 3.1 Data 1.0 Jakarta EE 11 Core Pro fi Updated Not Updated New
12. Jakarta EE 11 Core Pro fi le Updated Not Updated New RESTful Web Services 4.0 JSON Processing 2.1 JSON Binding 3.0 Annotations 3.0 CDI Lite 4.1 Interceptors 2.2 Dependency Injection 2.0
13. Jakarta EE 11 API source level: Java SE 17 API binary level: Java SE 17 TCK run with: Java SE 17+21 App Developers (YOU) can use Java SE 21 features if you like !!
14. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Release Cadence ~6-9 Months after the latest LTS of Java
15. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) May, 2024 Milestone 4 • Feature complete • All API jars released • For each API at least one compatible implementation (e.g. Hibernate, Mojarra) • Each compatible implementation passed standalone TCK <dependency> <groupId>jakarta.platform</groupId> <artifactId>jakarta.jakartaee-api</artifactId> <version>11.0.0-M4</version> <scope>provided</scope> </dependency>
16. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Q4, 2024 (Core Pro fi le) Q1, 2025 (Web Pro fi le) Q2, 2025 (Platform)
17. COPYRIGHT (C) 2022, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) CRaC
18. Running Application Running Application Aware of checkpoint being created Aware of restore happening
19. Source: Gerrit Grunwald, Azul
20. public interface Resource { void beforeCheckpoint(Context<? extends Resource> context); void afterRestore(Context<? extends Resource> context); } CRaC API <dependency> <groupId>org.crac</groupId> <artifactId>crac</artifactId> <version>1.5.0</version> </dependency>
21. JVM Application Resource Resource beforeCheckpoint() afterRestore() beforeCheckpoint() afterRestore()
22. java -XX:CRaCCheckpointTo=PATH -jar app.jar java -XX:CRaCRestoreFrom=PATH START RESTORE
23. CRaC Engines CRaC Engines
24. Checkpoint Restore In Userspace (CRIU)
25. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Warp -XX:CRaCEngine=warp
26. COPYRIGHT (C) 2022, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Jakarta EE and CRaC
27. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Jakarta Contexts and Dependency Injection 4.1 https://jakarta.ee/speci fi cations/cdi/4.1/
28. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) CDI Application Lifecycle Events
29. private void init(@Observes @Initialized(ApplicationScoped.class) Object init) { // initialised } private void destroy(@Observes @Destroyed(ApplicationScoped.class) Object init) { // destroyed } @Observes @Initialized(ApplicationScoped.class)
30. @ApplicationScoped public class StartupListener implements Resource { @Override public void beforeCheckpoint(Context<? extends Resource> context) { // before checkpoint } @Override public void afterRestore(Context<? extends Resource> context) { // after restore } } <dependency> <groupId>org.crac</groupId> <artifactId>crac</artifactId> <version>1.5.0</version> </dependency>
31. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Managed Resources
32. JVM Application Resource Resource beforeCheckpoint() afterRestore() beforeCheckpoint() afterRestore() Application Server External Resources
33. Demo
34. Helidon Quarkus Average startup Time (ms) 0 0,65 1,3 1,95 2,6 1,234 1,379 1,332 2,409 No CRaC CRaC kind of not very scienti fi c 2.3 GHz 8-Core Intel Core i9
35. COPYRIGHT (C) 2022, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Summary
36. Authorization 3.0 Activation 2.1 Batch 2.1 Connectors 2.1 Mail 2.1 Messaging 3.1 Enterprise Beans 4.0 RESTful Web Services 4.0 JSON Processing 2.1 JSON Binding 3.0 Annotations 3.0 CDI Lite 4.1 Interceptors 2.2 Dependency Injection 2.0 Servlet 6.1 Pages 4.0 Expression Language 6.0 Debugging Support 2.0 Standard Tag Libraries 3.0 Faces 4.1 WebSocket 2.2 Enterprise Beans Lite 4.0 Persistence 3.2 Transactions 2.0 CDI 4.1 Authentication 3.1 Concurrency 3.1 Security 4.0 Validation 3.1 Jakarta EE 11 Platform Updated Not Updated New Data 1.0 Under Developm ent
37. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) 2022 2024 2020 Java 21 Embrace Records Jakarta Data CDI Centric Removals and Deprecations javax.* -> jakarta.* Jakarta EE Core Pro fi le
38. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) CRaC
39. COPYRIGHT (C) 2025, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) Jakarta CRaC An Idea?
40. Project Leyden
41. Jakarta EE https://jakarta.ee Get Started
 https://start.jakarta.ee CRaC http://openjdk.org/projects/crac Demo Code https://github.com/mehmandarov/randomstrings https://rustam.no https://jakarta.ee/community/developer-advocate