Handling exceptions, the functional way
summary
Shows a concrete pattern and a tiny library called maybe that wraps Java 8 operations that can throw checked exceptions into two APIs: a resolver that returns a value and a run-effect that returns none. Uses custom throwing supplier / throwing runnable functional interfaces, method references, and a resolveClosing resource helper to close Closable objects. Demonstrates parsing properties and reading files with separate, type-safe handlers per exception, returning explicit fallbacks, avoiding mutable state, and publishing the library to Maven (Java 8+).
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chapters (7)
- 0:00Introduction
- 1:26Functional programming basics
- 11:18Traditional exception handling
- 21:47Functional abstractions for exceptions
- 30:08Introducing Maybe library
- 41:24Practical Maybe examples
- 45:21Summary and closing
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