How to upgrade Grails 2 applications and plugins to Grails 3

-
How to upgrade Grails 2 applications and plugins to work with Grails 3


 The Grails framework is a web framework for developing dynamic websites. It has been recently upgraded to version 3.0 and the upgrade has introduced breaking changes. According to the grails documentation, Grails 3.0 is a complete ground up rewrite of Grails and introduces new concepts and components for many parts of the framework.

The 'rewrite' part means that a lot has changed, including class packages.

This means that your plugin will break if it imports any of the Grails API packages that have been moved.

Although the Grails documentation provides a guide for upgrading applications and plugins, it does not provide information about all the Grails API package changes.


To save software development time, please find some of the package changes below.

Grails 2 Grails 3
org.codehaus.groovy.grails.web.servlet.mvc.GrailsParameterMap grails.web.servlet.mvc.GrailsParameterMap
org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes org.grails.web.util.GrailsApplicationAttributes
org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest org.grails.web.servlet.mvc.GrailsWebRequest
org.codehaus.groovy.grails.web.mapping.UrlMappingInfo grails.web.mapping.UrlMappingInfo
org.codehaus.groovy.grails.plugins.web.api.ResponseMimeTypesApi org.grails.web.mime.HttpServletResponseExtension
org.codehaus.groovy.grails.commons.GrailsApplication grails.core.GrailsApplication
org.codehaus.groovy.grails.web.mapping.DefaultUrlMappingsHolder org.grails.web.mapping.DefaultUrlMappingsHolder
org.codehaus.groovy.grails.commons.DefaultGrailsControllerClass org.grails.core.DefaultGrailsControllerClass
org.codehaus.groovy.grails.web.mapping.DefaultUrlMappingEvaluator org.grails.web.mapping.DefaultUrlMappingEvaluator
org.codehaus.groovy.grails.commons.DefaultGrailsApplication grails.core.DefaultGrailsApplication
org.codehaus.groovy.grails.commons.ClassPropertyFetcher org.grails.core.util.ClassPropertyFetcher
org.codehaus.groovy.grails.web.util.WebUtils org.grails.web.util.WebUtils
org.codehaus.groovy.grails.commons.ControllerArtefactHandler org.grails.core.artefact.ControllerArtefactHandler

Essentially, you need to change your package imports from Grails 2 plugins to the corresponding packages in Grails 3.

For more information about how to upgrade your grails application please see Upgrading your Grails application

Comments

Unknown said…
Will like to know what GRAILS is all about
August 14, 2015 at 7:37 AM
Post a Comment

Popular posts from this blog

How to accept PayPal payments on Grails

-
Image
How to accept PayPal payments with Grails Application. Introduction to Paypal payments plugin. The Paypal payments plugin simplifies the integration of Paypal with Grails applications.   Grails is a web framework for developing web applications and a plugin is a module that can be easily installed to add specific features to your application. Modules/Plugins are usually designed to accomplish a specific task.  Who should read this? Anyone interested in how to integrate paypal with a Grails application.  What you need A Paypal developer account with your API keys Grails paypal payments plugin Grails Application ( Version 2.x and above )  If you do not already have a Paypal developer account please visit  https://developer.paypal.com/developer/accounts/  to get one.  The paypal-payments plugin will provide the features required to interact with the Paypal API. You do not need to be a paypal payments guru to use Paypal.  A Grails ap
Read more

How to enable Grails application to send SMS via Twilio API

-
Image
How to send SMS with Grails Application via Twilio   Are you trying to send text messages from your Grails web application? If your answer is Yes then you are in luck. If your answer is No .. well... stick around... you'll learn something.  Target audience: People interested in software development, Grails framework and Groovy programming language. This article may be more interesting if you already know Grails framework.  What you need: A twilio account with your API keys The grails-twilio plugin Your grails application ( Grails version 2.x and above ) To create a twilio account, please visit  http://www.twilio.com . Copy your API Keys The twilio-grails plug-in provides sms sending capability to a Grails application via twilio api. Configuration Add twilio plugin Depending on what version of Grails you are using, open your buildConfig.groovy file or build.gradle file and add the following line. compile "org.grails.plugins:twilio:
Read more