Modern Java in Action
summary
A small GitHub crawler gets built that fetches pages, stops at external links, and prints counts; domain objects use records and a sealed interface hierarchy so pages are either External, GitHub (PR/issue) or Error. Networking uses the JDK HTTP client and parallelism uses virtual threads with structure task scope to fork per-link tasks and join results; sequence collections simplify list manipulation and a thread-dump shows parent/owner IDs. The demo mostly runs, with one live hiccup.
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chapters (10)
- 0:00Modern Java features
- 3:13GitHub crawler setup
- 8:07Records and sealed interfaces
- 13:22Mutable types for links
- 17:57HTTP client for requests
- 21:52Parallel fetching with virtual threads
- 26:12Link resolution and updates
- 31:27Debugging with structured concurrency
- 35:40Java 23 features overview
- 42:45Summary and resources
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