Give help infomation to enable '/shutdown' endpoint when executing `s…

…top-app` failed

Closes gh-18

commands/stop-app.groovy

@@ -1,6 +1,3 @@
-import javax.management.remote.JMXServiceURL
-import javax.management.remote.JMXConnectorFactory
-import javax.management.ObjectName
 import org.grails.io.support.*
 
 description("Stops the running Grace application") {
@@ -9,31 +6,43 @@ description("Stops the running Grace application") {
     flag name:'port', description:"Specifies the port which the Grace application is running on (defaults to 8080 or 8443 for HTTPS)"
     flag name:'host', description:"Specifies the host the Grace application is bound to"
 }
+
 System.setProperty("run-app.running", "false")
 
 Integer port = flag('port')?.toInteger() ?: config.getProperty('server.port', Integer) ?: 8080
 String host = flag('host') ?: config.getProperty('server.address', String) ?: "localhost"
 String contextPath = config.getProperty('server.context-path') ?: config.getProperty('server.contextPath') ?: ""
 String managementPath = config.getProperty('management.endpoints.web.base-path') ?: config.getProperty('management.endpoints.web.basePath') ?: "/actuator"
 console.updateStatus "Shutting down application..."
+
 def url = new URL("http://$host:${port}${contextPath}${managementPath}/shutdown")
 try {
-	def connection = url.openConnection()
-	connection.setRequestMethod("POST")
-	connection.doOutput = true
-	connection.connect()
-	console.updateStatus connection.content.text
-	while(isServerAvailable(host, port)) {
-		sleep 100
-	}
-	console.updateStatus "Application shutdown."
-	return true
-
+    def connection = url.openConnection()
+    connection.setRequestMethod("POST")
+    connection.doOutput = true
+    connection.connect()
+    console.updateStatus connection.content.text
+    while(isServerAvailable(host, port)) {
+        sleep 100
+    }
+    console.updateStatus "Application shutdown."
+    return true
 }
-catch (e) {
-	console.error "Application not running.", e
-	return false
+catch (java.net.ConnectException e) {
+    console.error "Application not running.", e
+    return true
 }
-
-
+catch (java.io.FileNotFoundException ignored) {
+    console.info '''# Please check that '/shutdown' endpoint enabled in 'app/conf/application.yml'
+management:
+    endpoint:
+        shutdown:
+            enabled: true
 
+'''
+    return true
+}
+catch (Exception e) {
+    console.error "Application shutdown error: ", e
+    return true
+}