The Dark Side of Java 8 - Lessons Learned
summary
Java 8 has concrete pitfalls and concrete fixes: flatMap eagerly evaluates nested streams, which can fully materialize infinite or large inner collections and is fixed in JDK10; filters don’t short‑circuit ordered data until you use takeWhile in JDK9; parallel streams run on a shared ForkJoinPool so tasks and parallelism are surprising unless you know the defaults; lambdas can be coerced to throw checked exceptions via type inference hacks; Stream.generate is unordered and Optional treats null as empty — watch for semantic gotchas.
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chapters (9)
- 0:00Introduction
- 6:00Conditional Stream Termination
- 10:08Lazy Semantics
- 19:18lambda expressions vs checked exceptions
- 24:48parallel processing
- 25:54multiple questions
- 31:46follow up
- 33:17streemgenerate
- 38:00Optional vs Option
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