Writing code only comes second when talking about the developer work. The main and first task is reading and debugging. For that purpose, the Eclipse Java development tools are wonderful. Its most powerful tools are often unknown though. This talk will help you unleash this power and help you debug your Java code like a pro. The talk will also cover the new debugging features that are coming with Eclipse 4.8 (code name Oxygen, to be released late June 2017). So, even if you're an experienced Java programmer, you will learn some tips and tricks. This talk will be full of live debugging sessions on various applications and of many kinds. Among others, you will see the following concepts in action: - All about breakpoints: conditional, method, hit counts, trigger (new in Oxygen), traces (new in Oxygen) - Local and remote debugging: local debugging is business as usual, but you will learn how to debug an application while it's running on a remote server. - Inspect and watch Java expressions: learn how to see value and watch complex expressions that may not be in your code to better understand what is going on. - Object details formatters: will explain how to override the toString() method of a class you don't own for your debugging purpose. - Logical structures: learn how to customize the tree viewer in the Variables view (e.g. to display you custom Collection as an array, without the bloody implementation details). Source code is available: https://github.com/mbarbero/eclipseconfrance2017-debuglikeapro-demo

1. Debug Java Code
Like a Pro with
Mikaël Barbero
Eclipse Foundation
EclipseCon France
June 22, 2017

2. Who knows what is a breakpoint?

3. Good news everyone!
Hardly no slide :)

4. Debug perspective
customization

5. Debug perspective
customization

6. Debug perspective
in a new window

7. Watchpoints
Field access &
modification
Method entry & exit

8. Exception
Breakpoints

9. Conditional
Breakpoints
&
Tracepoints

10. Trigger points

11. Remote
debugging
-agentlib:jdwp=transport=dt_socket,server=y,address=8000,suspend=y

12. Sort
Breakpoints

13. Launch group

14. Deadlock
detection

15. Inspect and
Watch
expressions

16. Object details
formatters

17. Logical
structure

18. What you should remember
• Lots of tools
• Browse the preferences and menus
• Read the docs :)

19. Q&A

20. Thank you!
@mikbarbero
mikael.barbero@eclipse-foundation.org
Code available
https://github.com/mbarbero/eclipseconfrance2017-debuglikeapro-demo