Comp150CPA Homework Exercise 1: Intro to Google AppEngine
- Objective: to create a simple working Google AppEngine application
running on the Google infrastructure.
- Deliverables: the application URL of your working instance in the
- Work mode: exercise/lecture reinforcement, group work and
In groups of 2-5 people, please create a google AppEngine
application that will keep a list of typed strings until they are
deleted. The user interface should include a list of strings typed so
far, a text field for a new one, a button that inserts the new string
into the list, and a button that clears all persistent data.
It should not insert empty strings into the list.
Steps in creating this include the following:
- If working from your own computer,
- download the J2EE version of eclipse from eclipse.org.
- Install the Google AppEngine Plugin for eclipse by following the instructions
- If working from a lab here, these should be already installed for Windows.
Activate your ECE/CS windows account and use it.
- Create a new "web application project" in eclipse.
Choose to use both "Google AppEngine" and "Google Web Toolkit" (note change; details in class).
- Obtain a (free) google account.
- Write and debug your application locally on that computer. For a great tutorial on how to do this, see the Google Code Tutorials on GWT.
- Obtain a google AppEngine application id by following the instructions
at the above link.
- When your application works locally, enter its application key into the
eclipse project and follow instructions to push the application into the
- Test it there. When it works, you will provide the URL of your application to us for testing.
You have to accomplish several things to do this:
- Define a JDO server method to store a string.
- Define a JDO server query to find all stored strings in order (e.g., date order).
- Write a client front-end with an appropriate user interface, that invokes each server method in turn. Hint: use a table widget.
Submitting completed assignments
Alas, the new submission system is not working yet and we will
submit this one on paper (how quaint!). Click
to fill out a form that -- when submitted -- generates a printable
form that can be either printed and slipped under Prof. Couch's door,
or emailed to
to be graded. Completed assignments will be graded by hand and
scanned into the same system as classroom exercises. The assignment
is due on Wed night Feb 10 at 11 pm, but technically, you can mail or
drop off a paper copy of the assignment under my door before I arrive
at work on Thu morning Feb 11, 2010. Lateness penalty is one point per