Grails
Grails is an open-source, full-stack web application framework for the Java Virtual Machine (JVM) built on top of the Groovy programming language. It follows the convention-over-configuration paradigm and integrates seamlessly with Java, Spring, and Hibernate to simplify rapid development of web applications. The framework provides features like GORM (Grails Object Relational Mapping), scaffolding, and a plugin system to enhance productivity.
Developers should learn Grails when building enterprise-grade web applications that require rapid prototyping, high productivity, and integration with existing Java ecosystems. It is particularly useful for projects that benefit from convention-based development, such as CRUD applications, RESTful APIs, and microservices, as it reduces boilerplate code and accelerates time-to-market. Grails is also a good choice for teams familiar with Java who want to leverage Groovy's dynamic features for more concise and expressive code.