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Have you tried these? for server-side (GAE) *com.google.appengine.repackaged.org.json.JSONObject.JSONObject(String arg0)* for client *com.google.gwt.json.client.JSONParser* I haven't tried japanese or chinese characters though, rather stuff like this: "Příliš žluťoučký kuň úpěl ďábělské ódy"

! In this blog post we learn how easy it is to deploy a simple Groovlet to the Google Appengine and how easy it is to parse JSON results.

Cron jobs / task queues Instead of using a framework like Quartz to schedule jobs, Google App Engine takes care of executing jobs for you. You simply enter a cron-like expression and a URL to call and your job is configured. You also have a task queue at your disposal. Your application code can add tasks to a task queue which will be executed later in the future, asynchronously. An example use case is that you don’t want clients to wait for an email to be sent before he sees the next page. Instead you can put the email task on the task queue and the email will be sent asynchronously.

When an email is received Google App Engine does a post on an URL in your application you configured. The HTTP body of the POST request contains the exact mime message as it was received by Google. To parse this mime message you can use the MimeMessage class provided by the JDK.