The slides used for the presentation at the Utrecht JUG on 17-1-24.

1. Rick Ossendrijver
Boosting developer effectiveness
with a Java Platform team

2. 2 • 17-January-24
Migrate!

3. 3 • 17-January-24
TestNG -> JUnit

4. 4 • 17-January-24
Your Product Owner…

5. 5 • 17-January-24
Automation is key

6. 6 • 17-January-24
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

7. 7 • 17-January-24
Picnic

8. 8 • 17-January-24
Picnic Tech
300
Engineers
35
Teams
5M
Lines of code
8
Years

9. 9 • 17-January-24
Our goal
Boost developer effectiveness
Minimal overhead
Focus on business logic
Autonomy
Openness

10. Developers
Building blocks for
developers
Multiplier effect
Convention over
configuration
Coding standards
Best practices
Centralized
configuration
Automation
Developer productivity Uniformity
Code quality
Reducing technical
debt
Migrations
10

11. 11 • 17-January-24
Java Platform Team
40 modules
Shared libraries Developer tooling
CI / CD
Monitoring

12. 12 • 17-January-24
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

13. 13 • 17-January-24
Picnic Java Support Modules
Maven Parent POM
Shared Libraries
Tools

14. 14 • 17-January-24
Plugins

15. 15 • 17-January-24
Maven license plugin
[WARNING] License: 'Affero General Public License (AGPL)'
used by 1 dependencies:
- Example dependency that uses AGPL.
(com.example.dependency:example:12.1.3 -
https://github.com/example/dependency)
[...]
[ERROR] Failed to execute goal
org.codehaus.mojo:license-maven-plugin:2.3.0:add-third-pa
rty (check-third-party-licenses) on project picnic-meta:
There are some forbidden licenses used, please check your
dependencies.
[...]

16. 16 • 17-January-24
Profiles

17. 17 • 17-January-24
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

18. 18 • 17-January-24
Maven dependency management

19. 19 • 17-January-24
Maven dependency management

20. 20 • 17-January-24
Dependency Upgrades at Picnic
Assign reviewers
Labels
Package managers
Automerge
Renovatebot / renovate
Universal dependency update tool that
fits into your workflows.

21. 21 • 17-January-24
21

22. 22 • 17-January-24
Maven enforcer plugin
[ERROR] Rule 1: DependencyConvergence failed with message:
[ERROR] Failed while enforcing releasability.
[ERROR] Dependency convergence error for
com.google.guava:guava:jar:31.1-jre paths to dependency are:
[...]
[ERROR] +-tech.picnic.example:example-api:jar:0.0.0-SNAPSHOT
[ERROR] +-com.google.guava:guava:jar:31.1-jre:compile
[ERROR] and
[ERROR] +-tech.picnic.example:example-api:jar:0.0.0-SNAPSHOT
[ERROR] +-com.google.truth:truth:jar:1.1.3:compile
[ERROR] +-com.google.guava:guava:jar:32.1.3-jre:compile

23. 23 • 17-January-24
Maven dependency plugin
[INFO] --- maven-dependency-plugin:3.6.1:analyze-only
(analyze-dependencies) @ cache-support ---
[ERROR] Unused declared dependencies found:
[ERROR] com.google.guava:guava:jar:32.1.3-jre:compile
[...]
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-dependency-plugin:3.6.1
:analyze-only (analyze-dependencies) on project
cache-support: Dependency problems found

24. 24 • 17-January-24
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

25. 25 • 17-January-24
Shared Libraries

26. 26 • 17-January-24
Shared Libraries

27. 27 • 17-January-24

28. 28 • 17-January-24
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

29. 29 • 17-January-24
Consistency
“The ratio of time spent reading versus writing is well over 10 to 1.”
- Robert C. Martin

30. 30 • 17-January-24

31. 31 • 17-January-24
Static analysis
checkstyle/checkstyle
Helps programmers write Java code
that adheres to a coding standard.
SonarSource/sonarqube
Continuous Inspection.

32. 32 • 17-January-24
Automation
Google/google-java-format
Reformats Java source code to comply
with Google Java Style.

33. 33 • 17-January-24
Open-source static analysis
Automated bug fixing
500+ Error Prone checks
Error Prone
Google/error-prone
Catch common Java mistakes
as compile-time errors

34. 34 • 17-January-24
Picnic open-sourced: Error Prone Support!
800+ Refaster rules
40+ Error Prone bug checks
https://error-prone.picnic.tech

35. 35 • 17-January-24
Error Prone BugPattern

36. 36 • 17-January-24
Refaster rule

37. 37 • 17-January-24
Refaster

38. 38 • 17-January-24
ArchUnit
https://www.archunit.org
▪ Architecture rules
▪ API
▪ Domain logic
▪ Freezing
b a r

39. 39 • 17-January-24
ArchUnit
https://www.archunit.org

40. 40 • 17-January-24
OpenRewrite
Large scale refactoring
Recipes
Migrations

41. 41 • 17-January-24
OpenRewrite
https://docs.openrewrite.org/recipes/java/spring/boot3/upgradespringboot_3_0

42. 42 • 17-January-24
Spring Boot 2 -> 3 migration
We migrated over 3M lines of code in 70+ repositories!

43. 43 • 17-January-24
The Experience for Developers
- Save time
- Upgrade policy
- Validating upgrades

44. 44 • 17-January-24
The fellowship of the Java Platform Team
Jarmila Kaiser Oksana Evseeva
Pieter Dirk Soels
Luca Hennart Nathan Kooij
Rick Ossendrijver Stephan Schroevers
Picnic
Lexicographically ordered, how we like it.

45. 45 • 17-January-24
Questions and feedback!
blog.picnic.nl
https://error-prone.picnic.tech
join.picnic.app
rickie rick_ossies