Empowering developers: Picnic's Java Platform Approach

1. Rick Ossendrijver
Empowering Developers:
Picnic’s Java Platform Approach

2. 2 • 22-November-23
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

3. 3 • 22-November-23
Picnic

4. 4 • 22-November-23
Automated Fulfillment
Center

5. 5 • 22-November-23
Picnic Tech
300
Engineers
35
Teams
5M
Lines of code
8
Years

6. 6 • 22-November-23
Our goal
Empower our developers
Focus on business logic
Minimal overhead
Autonomy
Openness

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

8. 8 • 22-November-23
Java Platform Team
40 modules
Shared libraries Developer tooling
CI / CD
Monitoring

9. 9 • 22-November-23
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

10. 10 • 22-November-23
Picnic Java Support Modules
Maven Parent
Shared Libraries
Tools

11. 11 • 22-November-23
Maven Parent POM
Modules
Properties
Dependency management
Dependencies
Build
Profiles

12. 12 • 22-November-23
Profiles

13. 13 • 22-November-23
Plugins

14. 14 • 22-November-23
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

15. 15 • 22-November-23
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 • 22-November-23
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

17. 17 • 22-November-23
Maven dependency management

18. 18 • 22-November-23
Maven dependency management

19. 19 • 22-November-23
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

20. 20 • 22-November-23
Dependency Upgrades at Picnic
Assign reviewers
Labels
Package managers
Automerge
Renovatebot / renovate
Universal dependency update tool that
fits into your workflows.

21. 21 • 22-November-23

22. 22 • 22-November-23
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

23. 23 • 22-November-23
Shared Libraries

24. 24 • 22-November-23
Shared Libraries

25. 25 • 22-November-23

26. 26 • 22-November-23
Picnic’s Java Platform Team
1
Centralized Maven configuration
2
Agenda
Dependency management
3
Shared libraries
4
Static analysis and automation tooling
5

27. 27 • 22-November-23
Static analysis
checkstyle/checkstyle
Helps programmers write Java code
that adheres to a coding standard.
SonarSource/sonarqube
Continuous Inspection.

28. 28 • 22-November-23
Automation
Google/google-java-format
Reformats Java source code to comply
with Google Java Style.

29. 29 • 22-November-23
OpenRewrite
Recipes
Large scale refactoring
Migrations

30. 30 • 22-November-23
OpenRewrite
https://docs.openrewrite.org/recipes/java/spring/boot3/upgradespringboot_3_0

31. 31 • 22-November-23
ArchUnit
https://www.archunit.org
▪ Architecture rules
▪ API
▪ Domain logic
▪ Freezing
b a r

32. 32 • 22-November-23
ArchUnit
https://www.archunit.org

33. 33 • 22-November-23
Open-source static analysis
Patching bugs
500+ Error Prone checks
Error Prone
Google/error-prone
Catch common Java mistakes
as compile-time errors

34. 34 • 22-November-23
Picnic open-sourced: Error Prone Support!
800+ Refaster rules
40+ Error Prone bug checks
https://error-prone.picnic.tech

35. 35 • 22-November-23
Error Prone BugPattern

36. 36 • 22-November-23
Refaster rule

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

38. 38 • 22-November-23
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.

39. 39 • 22-November-23
Questions and feedback!
blog.picnic.nl
https://error-prone.picnic.tech
join.picnic.app
rickie rick_ossies