Groovy is a dynamic language that runs on the Java Virtual Machine. Grails is a web application framework that uses Groovy. It allows building web applications quickly by generating the necessary configuration automatically and integrating with existing Java code. The document discusses Groovy testing, Grails architecture, controllers, services, managing databases and data migration in Grails. It also advertises a 4-day training on mastering Groovy and Grails.

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Introduction to

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What is Groovy?
Groovy is a dynamic, object-oriented
language for the Java Virtual Machine,
which builds on the strengths of Java but
has additional features inspired by
languages such as Python, Ruby, and
Smalltalk.

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What is Grails?
Grails is an open source web application
framework that leverages the Groovy
language and complements Java web
development. Grails is a standalone
development environment that can hide all
configuration details or allow integration of
Java business logic. It provides easy-to-use
tools to build web applications in Groovy.

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Grails Architecture

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Groovy Testing
• Groovy is a scripting language that is executed as Java Byte
Code.
• This allows a Mix & Match between Groovy and Java Code.
• Groovy comes with an AntBuilder that allows execution of Ant
scripts from usual Groovy code. This capability allows
executing WebTests, since WebTests are usual Ant tasks.
• By executing WebTest from a Groovy script, you can fully
leverage both the variety of WebTest steps and the
sophisticated language means of Groovy for structuring your
tests.

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Grails Controller
• A controller fulfils the C in the Model View Controller
(MVC) pattern and is responsible for handling web
requests. In Grails a controller is a class with a name that
ends in the convention "Controller" and lives in the grails-
app/controllers directory. A controller can be created
with the create-controller
Command: grails create-controller org.bookstore.hello

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Manage Databases
• Grails is really easy to get started with on green-field projects
because the domain model defines the database schema, so you
don't have to worry about that side of things. But what if you need
to work against an existing database? In that case, you have to
carefully map the domain classes yourself. If you have a large
schema, that could take a while.
• What about when new versions of your application go live? You
can't limit the application to the original schema used for the first
version, otherwise it wouldn't be able to evolve properly. You have
to be able to migrate the schema and also any existing data. Both
of these scenarios have corresponding plugins that can help solve
the problems.

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• Remember to check in your migrations.
• You can preview changelogs and changesets
• Always check your migrations
• Resetting locks
• You can use Sql to assign default values to new
columns
Data migration tips & tricks

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Grails Service Layer
• Grails defines the notion of a service layer. The Grails
team discourages the embedding of core application
logic inside controllers, as it does not promote reuse
and a clean separation of concerns. Services in Grails
are the place to put the majority of the logic in your
application, leaving controllers responsible for
handling request flow with redirects and so on.
Command: grails create-service helloworld.simple

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How you can master
Groovy and Grails?
Become an expert in 4 days.
World class Groovy And Grails training by the industry
experts.
More Details

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Suggested Audience & Other Details
• Prerequisites: Experience with developing application using
Java, Basic web technologies such as HTML and HTTP
• Suggested Audience:
– This training is designed for developers and architects interested in
Groovy and Grails.
• Duration – 4 Days
Syllabus

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For further info/assistance contact
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+91 80 656 79700
www.springpeople.com
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