Todo

Bugs

Deleting file doesn't clear it from javac
When you move a class to a different package, compiler still thinks it's in the old package
External delete causes find-references to crash because it's still in FileStore.javaSources()
Restart debug test doesn't work
Show 'not used' warnings for non-@Override package-private methods of private classes, because they can only be accessed from same file
Package template of new package which is sibling of existing package shows sibling + leaf, not parent + leaf.
Thing#close() shows 0 references for try (thing)
Changing class Foo {} to static class Foo {} doesn't fix "non-static variables this" in static void test() { new Foo() }
Fields don't show up in debugger
Debugger doesn't print arrays nicely
Imports are disappearing when errors are present
Delete imports from my own package
Generated method doesn't have static modifier when appropriate
Add import code action doesn't appear in extends clause
Docs are not getting resolved for field completions.
Create missing method always places the method in the current class, even if it belongs somewhere else.
Select entire name, find references => no results
Crashes if maven is not installed
Homebrew users don't have src.zip, detect java version and download the appropriate src.zip

Compilation is very slow in the presence of lots of errors
Use package graph to limit search for find-usages/goto-def
Package separately for windows, mac, linux (see https://github.com/rust-lang/rust-analyzer/blob/master/.github/workflows/release.yaml)

Autocomplete new method name based on "no such method" errors.
Search for methods in source and deps based on return type, parameters
"Find implementations" code lens on interfaces
Rename other types (see JavaLanguageServer#canRename)
set.contains(wrongType) should show some kind of warning (and probably other collections methods too)
Only show 'override inherited method' quick fixes when line is blank.
Go-to-definition should show references for class/method names
Show JDK sources in goto def
Show classpath and JDK sources in debugger
Warn for impossible null checks