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Container Services

4 roadmaps32 questions

The supporting services the container offers beyond wiring: resource loading, type conversion and formatting, application events, message sources for i18n, and Bean Validation integration. Interviewers dip in here when they want breadth rather than Boot trivia.

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Explain the PropertyAccessor abstraction and the difference between BeanWrapper (property access) and direct field access in DataBinder. When would you switch, and what are the tradeoffs?

level: principalimportance: nice to knowfreq 25%

basics

~10 s

PropertyAccessor is the get/set-by-name contract. BeanWrapper implements it via getters/setters; DirectFieldAccessor implements it by reflecting on fields directly. DataBinder.initDirectFieldAccess() switches from the former to the latter, so binding bypasses accessor methods.

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What are the key production pitfalls with MessageSource around MessageFormat quoting, encoding, missing keys, and the parent hierarchy?

level: principalimportance: nice to knowfreq 22%

basics

~20 s

Watch four things: single quotes must be doubled ('') only when a message has arguments; set defaultEncoding to UTF-8; decide missing-key behavior (throw vs default vs useCodeAsDefaultMessage); and set fallbackToSystemLocale=false so missing files fall back to the base bundle, not the server's locale.

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