joeRinehart/ErrorController.groovy

## createController
grails> create-controller Error

## development.gsp
<!doctype html>
<html>
<head>
	<title>Application Error - Development View</title>
        <meta name="layout" content="bootstrap">
        <meta name="bootstrap" content="main">
	<link rel="stylesheet" href="${resource(dir: 'css', file: 'errors.css')}" type="text/css">
</head>
<body>
        <p><em>This is a development view of an error, and would not be shown in production.</em></p>
	<g:renderException exception="${exception}" />
</body>
</html>

## ErrorController.groovy
import org.codehaus.groovy.grails.commons.GrailsApplication
import grails.util.GrailsUtil

class ErrorController {

    def index() {
        if ( GrailsApplication.ENV_PRODUCTION == GrailsUtil.environment ) {
            // Production: show a nice error message
            render(view:'production')
        } else {
            // Not it production? show an ugly, developer-focused error message
            render(view:'development')
        }
    }
}

## ErrorControllerDoingStuff.groovy
import org.codehaus.groovy.grails.commons.GrailsApplication
import grails.util.GrailsUtil

class ErrorController {

    def index() {

        // "Do stuff" with the exception:
        Exception exception = request.exception
        println "Here's what happened: ${exception}"

        if ( GrailsApplication.ENV_PRODUCTION == GrailsUtil.environment ) {
            // Production: show a nice error message
            render(view:'production')
        } else {
            // Not it production? show an ugly, developer-focused error message
            render(view:'development')
        }
    }
}

## ErrorControllerDoingStuffSafely.groovy
import org.codehaus.groovy.grails.commons.GrailsApplication
import grails.util.GrailsUtil

class ErrorController {

    def index() {

        try {
            // "Do stuff" with the exception:
            Exception exception = request.exception
            println "Here's what happened: ${exception}"

            if ( GrailsApplication.ENV_PRODUCTION == GrailsUtil.environment ) {
                // Production: show a nice error message
                render(view:'production')
            } else {
                // Not it production? show an ugly, developer-focused error message
                render(view:'development')
            }

        } catch ( Exception e ) {
            render(view: 'unhandleable')
        }

    }
}

## production.gsp
<!doctype html>
<html>
	<head>
		<title>Application Error</title>
        <meta name="layout" content="bootstrap">
        <meta name="bootstrap" content="main">
		<link rel="stylesheet" href="${resource(dir: 'css', file: 'errors.css')}" type="text/css">
	</head>
	<body>
        <h1>Application Error</h1>
        <p>We're sorry, but the application has encountered an error.  Please try again.</p>
	</body>
</html>

## UrlMappings.groovy
class UrlMappings {

	static mappings = {
                /* other stuff.... */
                "500"(controller: "error")
	}
}
	<!doctype html>
	<html>
	<head>
	<title>Application Error - Development View</title>
	<meta name="layout" content="bootstrap">
	<meta name="bootstrap" content="main">
	<link rel="stylesheet" href="${resource(dir: 'css', file: 'errors.css')}" type="text/css">
	</head>
	<body>
	<p><em>This is a development view of an error, and would not be shown in production.</em></p>
	<g:renderException exception="${exception}" />
	</body>
	</html>
	import org.codehaus.groovy.grails.commons.GrailsApplication
	import grails.util.GrailsUtil

	class ErrorController {

	def index() {
	if ( GrailsApplication.ENV_PRODUCTION == GrailsUtil.environment ) {
	// Production: show a nice error message
	render(view:'production')
	} else {
	// Not it production? show an ugly, developer-focused error message
	render(view:'development')
	}
	}
	}
	class UrlMappings {

	static mappings = {
	/* other stuff.... */
	"500"(controller: "error")
	}
	}