Automating away bugs with Error Prone in practice

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Error Prone is a powerful tool for detecting and preventing bugs and anti-patterns in Java codebases. As a compiler plugin, it is capable of automatically suggesting and applying fixes at scale. For years, Picnic has leveraged the capabilities of Error Prone to streamline our development process through large-scale automated refactorings across our entire Java codebase. This approach not only resolves bugs once and for all, but also leads to a more consistent and high-quality codebase. In this talk, we will provide a comprehensive demonstration of Error Prone's capabilities, as well as offer practical guidance on how to set up the tool for your own development team. Additionally, we will share our own experiences and learnings from Picnic's journey of using Error Prone, including the process of creating and enabling our own set of custom rules from our open-sourced Error Prone Support repository.

Software

Rick Ossendrijver
Automating away bugs
with Error Prone in practice

2 • 23-Feb-23
Picnic and its processes
1
Introduce Error Prone
2
Using Error Prone in practice!
3
Error Prone @ Picnic
4
Agenda

3 • 23-Feb-23
Mobile
+
Picnic’s Online Groceries Model
Groceries
+
Home Picnic
Lowest price
On-time
=
+ +

4 • 14-Feb-23
7
Years
300
Engineers
3M
Customers
5M
Lines of code
Our numbers

6 • 23-Feb-23
Excellent code quality
Good architecture
Bugs and uniformity
Review process
Automation

7 • 23-Feb-23
Code reviews and discussions

8 • 23-Feb-23
Tools
Google/google-java-format
Reformats Java source code to comply
with Google Java Style.
checkstyle/checkstyle
Helps programmers write Java code
that adheres to a coding standard.
spotbugs/spotbugs
A tool for static analysis to look
for bugs in Java code.
SonarSource/sonarqube
Continuous Inspection.

9 • 23-Feb-23
Picnic and its processes
1
Introduce Error Prone
2
Using Error Prone in practice!
3
Error Prone @ Picnic
4
Agenda

10 • 23-Feb-23
Open-source static analysis
Compiler plugin
Powerful
500+ Error Prone checks
Complex
Error Prone
Google/error-prone
Catch common Java mistakes
as compile-time errors

11 • 23-Feb-23
Refaster
Deﬁne refactorings with templates.
becomes

16 • 23-Feb-23
Bug patterns
https://errorprone.info/bugpatterns

17 • 23-Feb-23
Error Prone as superpower

18 • 23-Feb-23
Error Prone as superpower
What would that look like?
https://github.com/rickie/guava/

19 • 23-Feb-23
Picnic and its processes
1
Introduce Error Prone
2
Using Error Prone in practice!
3
Error Prone @ Picnic
4
Agenda

20 • 23-Feb-23
Roadmap to Enable Error Prone
Level 1:
Disable everything
Level 2:
Selectively turn on a
few ERROR checks
Level 3:
Turn on all default
ERROR checks

21 • 23-Feb-23
Demo: introducing Error Prone in practice!
Let’s demonstrate!

22 • 23-Feb-23
Roadmap to Enable Error Prone
Level 1:
Disable everything
Level 2:
Selectively turn on a
few ERROR checks
Level 3:
Turn on all default
ERROR checks

23 • 23-Feb-23
Picnic and its processes
1
Introduce Error Prone
2
Using Error Prone in practice!
3
Error Prone @ Picnic
4
Agenda

24 • 23-Feb-23
Error Prone @ Picnic
Common conﬁguration
./patch.sh
Continuous Integration

26 • 23-Feb-23
Picnic open-sourced: Error Prone Support!
700+ Refaster rules
40+ Error Prone bug checks
https://error-prone.picnic.tech

27 • 23-Feb-23
Picnic’s Error Prone Support
Run Refaster rules from classpath
Test support for Refaster rules
Improved reporting on Refaster rules
Documentation website
https://error-prone.picnic.tech

28 • 23-Feb-23
Error Prone Support website
https://error-prone.picnic.tech

29 • 23-Feb-23
Applying Error Prone Support @ Picnic
Introducing:
- all Refaster rules
- all Error Prone checks
Approach
Perspective
https://error-prone.picnic.tech

30 • 23-Feb-23
Applying Error Prone Support @ Picnic
60+ PRs spread over 40+ Java repositories
33.665 insertions (+) 31.281 deletions (-)

31 • 23-Feb-23
Applying Error Prone Support @ Picnic

32 • 23-Feb-23
Applying Error Prone Support @ Picnic

33 • 23-Feb-23
Current state of Error Prone Support
People contributing ideas (from reviews)
30+ contributors
Stickers
Adoption
GitHub Issues

34 • 23-Feb-23
Conclusion
Two perspectives:
- Happy developers!
- Platform team or conﬁguration
maintainers.

35 • 23-Feb-23
Unsure about next steps?
Feel free to reach out!
- https://errorprone.info
- https://error-prone.picnic.tech
Special thanks to:
Stephan Schroevers - stephan.schroevers@teampicnic.com
https://github.com/Stephan202
Contact details:
Rick Ossendrijver - rick.ossendrijver@teampicnic.com
https://github.com/rickie

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Automating away bugs with Error Prone in practice

1. Rick Ossendrijver Automating away bugs with Error Prone in practice

2. 2 • 23-Feb-23 Picnic and its processes 1 Introduce Error Prone 2 Using Error Prone in practice! 3 Error Prone @ Picnic 4 Agenda

3. 3 • 23-Feb-23 Mobile + Picnic’s Online Groceries Model Groceries + Home Picnic Lowest price On-time = + +

4. 4 • 14-Feb-23 7 Years 300 Engineers 3M Customers 5M Lines of code Our numbers

5. 5 • 23-Feb-23 Code quality

6. 6 • 23-Feb-23 Excellent code quality Good architecture Bugs and uniformity Review process Automation

7. 7 • 23-Feb-23 Code reviews and discussions

8. 8 • 23-Feb-23 Tools Google/google-java-format Reformats Java source code to comply with Google Java Style. checkstyle/checkstyle Helps programmers write Java code that adheres to a coding standard. spotbugs/spotbugs A tool for static analysis to look for bugs in Java code. SonarSource/sonarqube Continuous Inspection.

9. 9 • 23-Feb-23 Picnic and its processes 1 Introduce Error Prone 2 Using Error Prone in practice! 3 Error Prone @ Picnic 4 Agenda

10. 10 • 23-Feb-23 Open-source static analysis Compiler plugin Powerful 500+ Error Prone checks Complex Error Prone Google/error-prone Catch common Java mistakes as compile-time errors

11. 11 • 23-Feb-23 Refaster Deﬁne refactorings with templates. becomes

12. 12 • 23-Feb-23 Demo Let’s demonstrate!

13. 13 • 23-Feb-23 Maven proﬁle 1

14. 14 • 23-Feb-23 Maven proﬁle 2

15. 15 • 23-Feb-23 Demo Let’s demonstrate!

16. 16 • 23-Feb-23 Bug patterns https://errorprone.info/bugpatterns

17. 17 • 23-Feb-23 Error Prone as superpower

18. 18 • 23-Feb-23 Error Prone as superpower What would that look like? https://github.com/rickie/guava/

19. 19 • 23-Feb-23 Picnic and its processes 1 Introduce Error Prone 2 Using Error Prone in practice! 3 Error Prone @ Picnic 4 Agenda

20. 20 • 23-Feb-23 Roadmap to Enable Error Prone Level 1: Disable everything Level 2: Selectively turn on a few ERROR checks Level 3: Turn on all default ERROR checks

21. 21 • 23-Feb-23 Demo: introducing Error Prone in practice! Let’s demonstrate!

22. 22 • 23-Feb-23 Roadmap to Enable Error Prone Level 1: Disable everything Level 2: Selectively turn on a few ERROR checks Level 3: Turn on all default ERROR checks

23. 23 • 23-Feb-23 Picnic and its processes 1 Introduce Error Prone 2 Using Error Prone in practice! 3 Error Prone @ Picnic 4 Agenda

24. 24 • 23-Feb-23 Error Prone @ Picnic Common conﬁguration ./patch.sh Continuous Integration

25. 25 • 23-Feb-23 Now, we want more…

26. 26 • 23-Feb-23 Picnic open-sourced: Error Prone Support! 700+ Refaster rules 40+ Error Prone bug checks https://error-prone.picnic.tech

27. 27 • 23-Feb-23 Picnic’s Error Prone Support Run Refaster rules from classpath Test support for Refaster rules Improved reporting on Refaster rules Documentation website https://error-prone.picnic.tech

28. 28 • 23-Feb-23 Error Prone Support website https://error-prone.picnic.tech

29. 29 • 23-Feb-23 Applying Error Prone Support @ Picnic Introducing: - all Refaster rules - all Error Prone checks Approach Perspective https://error-prone.picnic.tech

30. 30 • 23-Feb-23 Applying Error Prone Support @ Picnic 60+ PRs spread over 40+ Java repositories 33.665 insertions (+) 31.281 deletions (-)

31. 31 • 23-Feb-23 Applying Error Prone Support @ Picnic

32. 32 • 23-Feb-23 Applying Error Prone Support @ Picnic

33. 33 • 23-Feb-23 Current state of Error Prone Support People contributing ideas (from reviews) 30+ contributors Stickers Adoption GitHub Issues

34. 34 • 23-Feb-23 Conclusion Two perspectives: - Happy developers! - Platform team or conﬁguration maintainers.

35. 35 • 23-Feb-23 Unsure about next steps? Feel free to reach out! - https://errorprone.info - https://error-prone.picnic.tech Special thanks to: Stephan Schroevers - stephan.schroevers@teampicnic.com https://github.com/Stephan202 Contact details: Rick Ossendrijver - rick.ossendrijver@teampicnic.com https://github.com/rickie

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