Grails Tips!

FLOSS Support in Sri Lanka

2009-01-15T02:03:00.000-08:00

The Linux Center - http://thelinuxcenter.lk/
Ceylon Linux - http://www.ceylonlinux.com/
Fossmart - http://www.fossmart.net/

Ultra Lightweight IDE to edit Groovy/GSP

2008-12-29T20:44:00.000-08:00

This is what it looks like.

Tired of bulky IDE's draining out your computer.

Gedit can turn out to be a lovely IDE with the bare essentials we need.
(Basically syntax highlighting and the file browser pane)

Here's what I configured.

Groovy/GSP syntax highlighting for Gedit.

An excellent tutorial explains this at http://noor.ojuba.org/2008/06/gedit-with-groovy/

Enable the File Browser Plugin in Gedit in Preferences>Plugins

Heres a screen shot of what it all looks like.

This plus the usual grails commands
as per

http://grails.org/Quick+Start

make developing grails apps a breeze even on lower end PC's.

Tomcat Out Of Memory

2008-12-28T19:46:00.000-08:00

Tomcat keeps running out of memory with jasperserver and a grails app.

Increasing the memory as per http://grails.org/FAQ#Application%20Servers
increasing the memory seems to help.

Added the following line to the top of my catalina.sh

export JAVA_OPTS="-Xms512M -Xmx512M -XX:MaxPermSize=1024m"

Apparently MaxPermSize is seperate from the -xMx heap setting.

http://wiki.caucho.com/-XX:MaxPermSize

Grails - Acegi - Set a custom after Logout page

2008-12-11T00:50:00.000-08:00

Crate a new action with the following code and set it as the action for your logout button.

(in this example the after logout paage is itemPrice/listDOA)

Code:

import javax.servlet.http.HttpSession

class LogoutController {

...

action {
HttpSession s = request.getSession()
s.invalidate()
redirect(controller:"itemPrice", action:"listDOA") // this is the new after
}
}

Charts in Jasper Reports with the Grails Jasper Plugin

2008-12-11T00:41:00.001-08:00

Including jasper reports in your grails application is trivial with the jasper grails plugin.

However, if you need to include a 'chart' in your jasper report, grails complains about a missing jfreechart lbrary ...

I get the error,
----------------------------
Grails Runtime Exception
Error Details
Message: org/jfree/chart/plot/

PlotOrientation
Caused by: java.lang.NoClassDefFoundError: org/jfree/chart/plot/PlotOrientation
Class: JasperService
At Line: [92]

This is because it can't find the jfreechart library required by jasper reports to create the chart.

The following solution worked for me.

Obtain jfreecharts from

http://www.jfree.org/

and the copy the following lib files found in the doanloaded jfreecharts archive'slib dir to the grails lib dir.

jcommon-1.0.14.jar jfreechart-1.0.11.jar

(i got the latest versions and it works with grails 1.0.3 )