API / Apache Grails Interview questions
What is the difference between Grails' component model and Spring Boot's plain REST controller approach?
Grails is built directly on Spring Boot, so the comparison isn't "Grails versus Spring Boot" as competing technologies — it's a question of how much of Grails' additional convention layer (GORM, GSP, scaffolding, plugin ecosystem) a project actually wants on top of the same underlying Spring foundation.
| Grails | Plain Spring Boot REST controller |
| Convention-driven controllers, domain classes, GORM persistence | Explicit @RestController classes, manually chosen persistence layer (JPA, JDBC, etc.) |
| GSP views and scaffolding available for full web apps | No built-in view layer; typically pure JSON/data responses |
| Groovy-first, though Java interoperates freely | Java-first, though Groovy/Kotlin can also be used |
| Bigger opinionated framework layer on top of Spring | Thinner layer directly against Spring's own APIs |
A team already comfortable writing plain Spring Boot REST services and wanting maximum control over every layer might reasonably skip Grails' extra conventions entirely; a team that wants GORM's productivity, GSP's templating, and a plugin ecosystem handling common cross-cutting concerns gets meaningfully more out-of-the-box structure by building on Grails instead, at the cost of learning its specific conventions.
Is Grails a competing alternative technology to Spring Boot, or built on top of it?
What does a plain Spring Boot REST controller approach typically lack that Grails provides out of the box?
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