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link:{api}grails/web/api/WebAttributes.html[WebAttributes] is one of the traits provided by the framework.  Any Groovy class may implement this trait to inherit all of the properties and behaviors provided by the trait.

[source,groovy]
.src/main/groovy/demo/Helper.groovy
----
package demo

import grails.web.api.WebAttributes

class Helper implements WebAttributes {

    List<String> getControllerNames() {
        // There is no need to pass grailsApplication as an argument
        // or otherwise inject the grailsApplication property.  The
        // WebAttributes trait provides access to grailsApplication.
        grailsApplication.getArtefacts('Controller')*.name
    }
}
----

The traits are compatible with static compilation...

[source,groovy]
.src/main/groovy/demo/Helper.groovy
----
package demo

import grails.web.api.WebAttributes
import groovy.transform.CompileStatic

@CompileStatic
class Helper implements WebAttributes {

    List<String> getControllerNames() {
        // There is no need to pass grailsApplication as an argument
        // or otherwise inject the grailsApplication property.  The
        // WebAttributes trait provides access to grailsApplication.
        grailsApplication.getArtefacts('Controller')*.name
    }
}
----
