Running Google App Engine in Eclipse

In this article I'm going to show you how to develop and deploy a small Java app engine application on Google App Engine using Eclipse IDE.

STEP 1
First you have to install Eclipse IDE for that . Its free so anyone can download. Here is the link.
Eclipse IDE

STEP 2
Now install Java SDK. Here is the link..
Java SDK

STEP 3
Now install the Google Eclipse App Engine plugin.
Ref Link : http://code.google.com/eclipse/docs/install-from-zip.html

STEP 4
Install the Google web toolkit plugin.
Ref Link : http://code.google.com/webtoolkit/gettingstarted.html

• There is easiest way to follow Step 3 and 4. Click Help --> Eclipse Market Place 
• Type Google App Engine
• install the plugin

STEP 5

Create Web Application.

File --> New --> Web application or Simply click the g icon (blue background).

• Enter the Project Name  as GuestBook and Package name as guestbook.
• Make sure Google Web Toolkit checkbox and Google App Engine check box is selected.
• Click Finish.

STEP 6

Now it will create the project structure like this.

There are some files that Eclipse automatically created.

• src/GuestBookServlet.java
• war/WEB-INF/web.xml
• war/WEB-INF/appengine-web.xml 

STEP 7

After that debug your app like this. Click Run ---> Debug as ---> Web Application 

now it will create a server 8888 port so you can access it by browsing http://localhost:8888/

STEP 8

To deploy your app to Google App Engine right click the app select Google --> Deploy to App Engine

Before deploy get application ID from http://code.google.com/appengine/ .

Those are the major steps that you want to follow to create and deploy Java App Engine application to Google App Engine.