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Coding by convention is at the heart of Grails, a rapid application development framework implemented in Groovy, a dynamic language that is syntactically similar to Java and runs in the Java Virtual Machine (JVM). Grails is implemented through a series of plugins. Each of these plugins is executed during application initialization and is able to register beans in the Spring ApplicationContext. There is a plugin to configure Hibernate, another plugin to tell Spring and Hibernate that all classes in the domain directory can be persisted to the database, another plugin to register all classes under the controllers directory as Spring controllers, and so on. This paper shows the power of Grails through the practical example of building a blog application.
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