Complete GWT based sign-up system

have anyone come across a complete GWT app with registration开发者_运维知识库/sign-up page to start with--unlike with PHP. Until now I haven't find such app that have the ability to register user, have the user a 'user page' and so on. With integration to MySQL and other db to persist user data. Does anyone know such code to start with.

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A GWT app is quite useless without an appropriate backend (Java, PHP, Python, etc).
In the end GWT code is only compiled to client-side javascript code. With client-side javascript you can't access any database on the server and thus any GWT app also requires a backend in order to access a database like MySQL.

So in order to create a registration/sign-up app you have to write both backend and frontend code.
For the frontend and the UI respectively you can use GWT. For the backend you can use any server side technology. The tightest integration with GWT can be achieved with a Java backend but you can also use non-java backends like PHP, Ruby, Python, etc.
GWT will communicate either via RPC/RequestFactory (Java) or RequestBuilder (non-java backends). Fore more information refer to the GWT docs.

So I recommend following steps:

1. Decide which backend technology you are going to use. Java offers the tightest integration (RPC,RequestFactory, etc). However for small/simple apps sometimes it is easier to use non-java backends like Python or PHP because they can be setup/implemented faster/easier.
2. Implement the business logic on the server-side. In your case this includes among others "adding new users to the database", "signing up users", "retrieving user information", etc
3. Design and implement the UI with GWT. In your case this will be the user-page and the form to fill in details for signing up, etc.
4. Write the communication part between frontend and backend in GWT using RequestFactory/RPC (Java) or RequestBuilder (non-Java)

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What kind of application are you going to develop? If your project is a public website and you plan to run it on GAE, you could use Google App Engine User Service.

http://code.google.com/appengine/docs/java/users/

For enterprise apps this is probably not a valid option...