1. Reloadable Plugins Why Do I Care? How does Reloadability Work? How do I make sure my plugin is reloadable? How do I test this? Common Patterns

4. When you reload a plugin the classloader is redelegated

5. However classloader can only be GC'd if there are no GC roots holding it

7. You have a strong reference you are not releasing, probably in a cache

8. You are abusing ThreadLocals

9. You have done some fancy footwork to get a static in another classloader

11. Solution is to close resources in a Plugin Disabled event

12. General form of these slides – demo the problem, then show the solution

14. Solution is to use Supplier, or a map of WeakReferences etc.

17. Make sure they are in private packages

18. Avoid the temptation of using statics in other plugins – you are tiesd to their lifecycle now

20. Instrument your code

24. Register as a listener for PluginEvents

25. This will all be code based