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Echo2 Plugin

Echo2 Plugin

Abstract^

This plugin adds Echo2 capability to a grails application. See http://www.nextapp.com/platform/echo2/echo/ for Echo2 examples.

Current plugin version: 0.1 ^

Libraries included:

  • Echo2_App.jar
  • Echo2_WebRender.jar
  • Echo2_WebContainer.jar
  • Echo2_Chart_App.jar: echo2 charting components http://wiki.nextapp.com/echowiki/Echo2Chart
  • Echo2_Chart_WebContainer.jar: plumbing required for charting components
  • Echo2_Extras_App.jar: echo2 extras components
  • Echo2_Extras_WebContainer.jar: plumbing required for extras components
  • Echo2_FileTransfer_App.jar: file transfer components
  • Echo2_FileTransfer_WebContainer.jar: plumbing required for file transfer components
  • echopointng-2.1.0rc5.jar: EchoPointNG http://wiki.nextapp.com/echowiki/EchoPointNgGuideToComponents
  • jcommon-1.0.0.jar
  • jfreechart-1.0.0.jar

Command options list ^

option description usage
create-echo2 creates an Echo2 application instance class in grails-app/echo2 grails create-echo2 <name>

Installation ^

Download site:

If you use a command of 'grails install-plugin echo2', you don't need to download at all.

This command will download a latest release zip file automatically from http://plugins.grails.org/grails-echo2.

How to use Echo2 plugin ^

  1. Create an ApplicationInstance 
    > grails create-echo2 Hello
  2. Then edit such as follows: 
    /*** testapp/grails-app/echo2/HelloApplicationInstance.groovy ***/

import nextapp.echo2.app.*;
import nextapp.echo2.app.Window;

class HelloApplicationInstance extends ApplicationInstance
{
	public Window init()
	{
		Window window = new Window();
		window.setTitle("HelloApplicationInstance");

		ContentPane contentPane = new ContentPane();
		window.setContent(contentPane);

		contentPane.add(new Label("HelloApplicationInstance"));

		return window;
	}
}

/********************************************/
  3. Start a web application 
    > grails run-app
  4. Access http://localhost:8080/testapp/hello.echo2 to watch an example app

Known Issues ^

Groovy objects trying to override final methods from nextapp.echo2.app.ContentPane or nextapp.echo2.app.Component

Due to a bug (see http://jira.codehaus.org/browse/GROOVY-2326) in groovy system it's not possible to a groovy class to

extend any class that extends nextapp.echo2.app.Component because nextapp.echo2.app.ContentPane defines a

public final Object getProperty(String name) method.

Q&A ^

  • Isn't it needed to create a servlet that extends nextapp.echo2.webcontainer.WebContainerServlet?

No. The plugin automatically adds a new org.codehaus.groovy.grails.plugins.echo2.GrailsWebContainerServlet

for each ApplicationInstancfound

Further developments ^

  • Echo2Builder: a clone of groovy SwingBuilder for Echo2 components
  • Scaffolding
  • suggestions accepted

Plugin version history^

  • Nov 22nd, 2007
    • first version, tested on grails.1.0-rc1
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