Virtual Threads (source: Microsoft). More about this feature is available in Oracle's Java Magazine article, " Coming to Java 19: Virtual threads and platform threads." Debugging in Java on VS Code is ...

Debug UI Debug views work against the standard model and update in response to debug events. These include Debug, Variables, Registers, Expressions, Breakpoints, Console.

Debugging is fairly standard: you typically set breakpoints and then view variables in a tab of the debugging perspective. You can, of course, step through your code and evaluate expressions.