Apache Grails

What is Grails? Apache Grails is a full-stack web application framework built on top of the Spring Boot ecosystem. It follows the convention-over-configuration paradigm and is ...

Setting Up the Environment Before creating a Grails application, you need Java Development Kit (JDK) 8 or higher and the Grails SDK installed. You can install Grails using SDKMAN ...

Convention over Configuration Grails relies heavily on conventions to reduce boilerplate configuration. If you follow the naming and placement rules, Grails automatically wires ...

Domain Classes Domain classes in Grails represent your data model. Each class maps to a database table, and each property maps to a column. Grails uses GORM (Grails Object ...

Understanding Controllers Controllers in Grails handle incoming HTTP requests and produce responses. Each controller contains actions - public methods that correspond to URL ...

URL Mappings Configuration URL mappings in Grails define how URLs map to controller actions. They are configured in grails-app/controllers/.../UrlMappings.groovy and provide a ...

What is GSP? Groovy Server Pages (GSP) is Grails's view technology for generating HTML. GSP files live in grails-app/views and use a mix of HTML and Groovy expressions to render ...

What are Services? Services in Grails encapsulate business logic separate from controllers. They follow a naming convention: a class named BookService in grails-app/services is ...

Why Validate? Validation ensures that data meets your application's requirements before it reaches the database. In Grails, domain classes and command objects use constraints to ...

The Plugin System Grails has a rich plugin ecosystem that extends the framework with additional features. Plugins are managed via Gradle and can be installed with a single ...