Jakarta EE 9 introduces the migration of the javax to jakarta package in the platform, impacting the ecosystem and, therefore, the end-users. This session covers background, recommendations and code driven strategies to help you navigate the migration of your Java Enterprise applications using Apache TomEE.

1. @CesarHgt @tomitribe
César Hernández
Paving the way with Jakarta EE
and Apache TomEE

2. @CesarHgt @tomitribe
Who am I?
César Hernández
● Senior Software Engineer at Tomitribe
● Java Champion & Oracle Groundbreaker Ambassador
● Duke’s Choice Award 2016, 2017
● Oracle Certified Professional
● +14 experience with Java Enterprise
● Apache TomEE, Eclipse Jakarta EE Committer,
contributor for Microprofile.
● Open Source advocate, teacher and public speaker

3. @CesarHgt @tomitribe
From J2EE to Jakarta EE

4. @CesarHgt @tomitribe
Innovation versus Standardization

5. @CesarHgt @tomitribe
Usual complains about standards
• Slow
• Don’t guarantee portability
• Don’t have feature X
• Don’t innovate
• It’s just a bench of vendor experts

6. @CesarHgt @tomitribe

7. @CesarHgt @tomitribe
From Java EE to Jakarta EE

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Eclipse Foundation overview
https://www.eclipse.org/membership/documents/eclipse-foundation-overview.pdf
360+ 275+ 1550+
195M+ 15 30

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Some Eclipse (Java) Projects

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What makes Jakarta EE different?

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What’s transferred?

12. @CesarHgt @tomitribe
How big is that?
• Jakarta EE
• 5,5 million lines of code
• 2,2 million lines of comments
• 61k files
• TCK (Test Suite)
• 4,6 million lines of code
• 1,1 million lines of comments
• 34k files

13. @CesarHgt @tomitribe
13,5 million lines of code
in 95k files.

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Participation
• + 80 active contributors
• + 200 designated committers
• +1000 commits
• + 900 PRs
https://jakarta.ee

15. @CesarHgt @tomitribe
What has NOT been donated?
• Java EE Brand name
• The javax.* namespace
egrep -lRZ 'javax' . | xargs -0 -l sed -i -e 's/javax/jakarta/g'
https://simpsons.fandom.com/wiki/Benjamin_(nerd)?file=Benjamin,_Doug,_and_Gary.gif

16. @CesarHgt @tomitribe
The javax.* namespace
• Oracle decides to restrict javax.* namespace
• Unchanged APIs can still use javax.* namespace
• Any other changes not allowed
• Adding a value to an enum
• Overriding/adding a method signature
• Adding default methods in interfaces
• Compensating for Java language changes

17. @CesarHgt @tomitribe
javax.* to jakarta.* namespace
• Remember the stats slide
• How to maintain binary
compatible for existing
applications
• Community discussion lead
to a Big Band approach
https://jakarta.ee/resources/JakartaEE-Datasheet-July172020_final.pdf

18. @CesarHgt @tomitribe
The jakarta.* namespace migration strategy
• Big-bang Jakarta EE 9, Jakarta EE 10 new features
• One time move from javax to jakarta namespace
• Not prolonging industry cost and pain associated with transition
• Incremental change in Jakarta EE 9 and beyond
• Evolve API sources from javax to jakarta namespace as needed basis
• Most active specifications would move immediately in Jakarta EE 9
• Every Jakarta EE release, starting from 10 may involve some javax to jakarta
namespace transition

19. @CesarHgt @tomitribe
Jakarta EE milestone release
● javax.* namespace no longer valid; need to use jakarta.*
● Implementations are available
○ API jars are available for all components
○ Initial component implementations for all APIs
○ Initial TCKs for all APIs
○ Draft Full Platform and Web Profile specifications
● Available on JDK 8; JDK 11 support planned post GA

20. @CesarHgt @tomitribe

21. @CesarHgt @tomitribe
Apache TomEE
● Apache Tomcat + Java EE = Apache TomEE
● Built from Apache components
● MicroProfile compliant
● Footprint: 30MB zip, 100~MB memory
● TomEE 9.0.0-M1 (javax -> jakarta)

22. @CesarHgt @tomitribe
tomee.apache.org

23. @CesarHgt @tomitribe
Apache TomEE
TomEE JAX-RS Microprofile
Java Server Pages
(JSP)
Java Server Faces
(JSF)
Java Transaction
API (JTA)
Bean Validation
Enterprise
JavaBeansJavaMail API
Java API for
RESTful Web
Services (JAX-RS)
Java Persistence
API (JPA)
Contexts and
Dependency
Injection (CDI)
Java Servlets
Java
Authentication and
Authorization
Service (JAAS)
Java Authorization
Contract for
Containers (JACC)
http://tomee.apache.org/comparison.html

24. @CesarHgt @tomitribe
TomEE 9 M1
● Bytecode level
○ Eclipse Transformer
○ TomEE Patch Plugin.
● No branches. No forks. No merge-conflict hell. Just two separate
binaries from the same source; TomEE 8x for javax users: TomEE 9x for
jakarta users.
● 90% pass rate on the Jakarta EE 9 Milestone 1 Web Profile TCK.

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Jakarta EE 9 Up and Running
Get the Binary :)
1. Donwload apache-tomee-9.0.0-M1-plus.zip from
https://tomee.apache.org
2. unzip apache-tomee-9.0.0-M1-plus.zip
3. chmod +x apache-tomee-plus-9.0.0-M1/bin/catalina.sh
4. ./apache-tomee-plus-9.0.0-M1/bin/catalina.sh run

27. @CesarHgt @tomitribe
Build and run
1. wget https://github.com/apache/tomee/archive/tomee-project-8.0.4.zip
2. unzip tomee-project-8.0.4.zip
3. cd tomee-tomee-project-8.0.4/examples/moviefun-rest
4. idea . #Or your favorite IDE
5. mvn verify
6. Inspec moviefun-rest-jakartaee9-8.0.4.war
7. cp target/moviefun-rest-jakartaee9-8.0.4.war <TomEE9M1_HOME>/webapps
Jakarta EE 9 Up and Running

28. @CesarHgt @tomitribe
Jakarta EE 9 Up and Running
Test the application
curl -X POST http://localhost:8080/moviefun-rest-jakartaee9-8.0.4/rest/load
curl -s http://localhost:8080/moviefun-rest-jakartaee9-8.0.4/rest/movies/ | jq
open https://tomee.apache.org/tomee-9.0/examples/moviefun-rest.html

29. @CesarHgt @tomitribe
● https://www.tomitribe.com/blog/jakarta-ee-9-milestone-and-apache-t
omee-9-0-0-m1/
● https://tomee.apache.org/tomee-9.0/docs/
Resources

30. @CesarHgt @tomitribe
Jakarta EE 10 and beyond
The future of cloud-native Java

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Shifting to Cloud native applications
• Meanwhile cloud became a reality

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Shifting to Cloud native applications

33. @CesarHgt @tomitribe
How to contribute in Jakarta EE?
• jakarta.ee/connect
○ Community, Working Group and Projects Mailing List
○ Slack, Newsletter, Blogs, Social Media
• Join Jakarta EE community meetings
• Join EE4J top project and Jakarta EE working group
• Spread the word by speaking at conferences or blogging

34. @CesarHgt @tomitribe
How to contribute in TomEE?
• tomee.apache.org/community
• Share your migration takeaways
• Documentation
• Website fixes
• Code tests
• Code examples
• Coverage increase for unit, integration, performance and static tests
• Workshops

35. @CesarHgt @tomitribe
Thank you
César Hernández
Paving the way with Jakarta EE
and Apache TomEE