Comments on: Goolge app engine + java + spring + REST + JSON + Flex – Part 3

By: trey

trey — Wed, 03 Nov 2010 06:50:18 +0000

Today, would you still go the [Spring] route for RESTful Java Servlets on GAE(Google App Engine)? I spent a couple days searching google and the web, and the only decent Java examples I found used [Restlet] or [Jersey].

Restlet:
http://blog.noelios.com/2009/04/11/restlet-in-the-cloud-with-google-app-engine/
http://wiki.restlet.org/docs_2.0/13-restlet/275-restlet/252-restlet.html

Jersey:
http://tugdualgrall.blogspot.com/2010/02/create-and-deploy-jax-rs-rest-service.html

By: Tomas Mazukna

Tomas Mazukna — Fri, 08 Oct 2010 13:22:02 +0000

Janka,

There is no RPC (remote procedure call) in my sample.
And a lot of time has passed since this example was implemented, looks like appengine implementation has changed somewhat and I see a nullpointer exception somewhere in runtime verifier…..

By: Janka

Janka — Fri, 08 Oct 2010 13:09:54 +0000

Hi,
i like integrate the php rpc-json client:
http://jsonrpcphp.org/index.php?page=example&lang=en
whith your sample.
What is the url in your project that use
JSON RPC ?
where is the unit into java code?
Thank’s

By: Janka

Janka — Fri, 08 Oct 2010 13:04:57 +0000

Hi,
i have tried your sample:
http://rest-json.appspot.com/
but i having this error:

(mx.messaging.messages::ErrorMessage)#0
body = “”
clientId = “DirectHTTPChannel0″
correlationId = “2CB3D6D6-068D-208F-FC36-8BF041B08867″
destination = “”
extendedData = (null)
faultCode = “Server.Error.Request”
faultDetail = “Error: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032"]. URL: http://rest-json.appspot.com/api/login/”
faultString = “HTTP request error”
headers = (Object)#1
DSStatusCode = 0
messageId = “ACCD0BDC-FF4A-4AD9-6DA2-8BF04337077A”
rootCause = (flash.events::IOErrorEvent)#2
bubbles = false
cancelable = false
currentTarget = (flash.net::URLLoader)#3
bytesLoaded = 0
bytesTotal = 0
data = “”
dataFormat = “text”
eventPhase = 2
target = (flash.net::URLLoader)#3
text = “Error #2032″
type = “ioError”
timestamp = 0
timeToLive = 0

By: Tomas Mazukna

Tomas Mazukna — Mon, 12 Apr 2010 14:23:55 +0000

In Part 2 I had a singleton called PMF and got a handle to the persistence manager through that. It was a how I started trying to get Spring MVC running inside GAE. Later I cleaned up my act and instructed Spring to inject persistence manager where I needed it using @Autowired annotation. I would advise using @Autowired. This way your classes do not need to know who is providing the persistence manager.

Cheers! Tomas

By: Chen

Chen — Sat, 10 Apr 2010 08:34:45 +0000

hi Tomas – super Job!! this tutorial is one of the best out there.

I have a question regarding this specific part – can you elaborate on the @Autowired annotation that you used here? In part 2 you did not use that – you went for the PMF.getManager(). So when and why do you recommend using either of this methods?

Thanks! Chen.

By: Tomas Mazukna

Tomas Mazukna — Wed, 17 Mar 2010 19:30:21 +0000

There is no encoded type. If you think about it there is no point in having encoded type, since you will set and get data un-encoded. Your best bet is storing password as string and encoding it in the application. I went that route.

By: Romain

Romain — Wed, 17 Mar 2010 19:25:55 +0000

Great article! I see you defined password as a String. Do you know if there is a type that allow encoding of password in BigTable? Thanks.

By: Tomas

Tomas — Fri, 19 Feb 2010 12:50:44 +0000

The plugin for the social bookmarking is called Sciable.

By: Adrian Taylor

Adrian Taylor — Fri, 19 Feb 2010 11:55:37 +0000

You have really great taste on catchy article titles, even when you are not interested in this topic you push to read it