getUrlName() can return existing links or do the mapping of given object to 
URL, see Action javadoc [1] for details.

Probably the most easy way how to display something is e.g. this:

@Extension
public class DataPlotRoot implements RootAction {

    public String getIconFileName() {
        return "/plugin/data-processing-plugin/img/x-office-presentation.png";
    }

    public String getDisplayName() {
        return "Data processing";
    }
   
    public String getUrlName() {
        return "data-processing";
    }
}

and in put into (applies for plugin org.jenkinsci.plugins.dataprocessing) 
src/main/resources/org/jenkinsci/plugins/dataprocessing/DataPlotRoot/
file called index.jelly
Content of this file will be shown when you click the link.

[1] http://javadoc.jenkins-ci.org/hudson/model/Action.html#getUrlName()

On Friday 20 April 2012 04:29:53 MaxiTrompe wrote:

Yes, this is what I have already done: I have a class RootAction that return a 
url for a new page, but when I click on it, I have the following error
 
404 Not Found
Stapler processed this HTTP request as follows, but couldn't find the resource 
to consume the request 
-> evaluate(<hudson.model.Hudson@1299db6> :hudson.model.Hudson,"/dummyurl")
-> 
evaluate(((StaplerProxy)<hudson.model.Hudson@1299db6>).getTarget(),"/dummyurl")
-> evaluate(<hudson.model.Hudson@1299db6>.getDynamic("dummyurl",...),"")
-> evaluate(<hudson.plugins.sidebar_link.LinkAction@ebb788> 
:hudson.plugins.sidebar_link.LinkAction,"")
-> No matching rule was found on 
<hudson.plugins.sidebar_link.LinkAction@ebb788> for ""
<hudson.plugins.sidebar_link.LinkAction@ebb788> has the following URL 
mappings, in the order of preference: 
TOKEN.groovy for url=/TOKEN/... 
VIEW.jelly for url=/VIEW 
hudson.plugins.sidebar_link.LinkAction.getIconFileName() for 
url=/iconFileName/... 
hudson.plugins.sidebar_link.LinkAction.getUrlName() for url=/urlName/... 
hudson.plugins.sidebar_link.LinkAction.getDisplayName() for 
url=/displayName/... 
java.lang.Object.getClass() for url=/class/... 


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