Hi everyone,

 I have been in process of developing a sample app in  jdo using
googleappengine with java, and  i have developed that application by
folowing  sample apps in the demos folder

appengine-java-sdk-1.2.5\demos\


and my application name is Guestbook in demos folder ,i followed the
same code as if its given in demos folder,In this particular we have
been using pmf and i didnt understand the role of pmf in this
particular app and iam not clear with the execution flow of the app,
(i mean that from step ->user sending request-> to server responding
to user request )
i want to know the step by step flow of execution of the application
and also the role of pmf in the app.Finally this app is meant for
authenticating   the user account with googleaccount,and iam not able
to do that functionality in my application, So i want to know how can
i authenticate users input  account with google account ,So someone
please help me with the solution for this problem

and finally when i send user request to this particular application
iam getting the following output..........



Hello, anu.fortune! (You can sign out.)

An anonymous person wrote:

    null

wrote:

    null

wrote:

    null

 I dont know why iam getting null s in output and when i enter the
email id its directly entering in to the apps output with iout
checking with google account   so please tell me how can i
authenticate   the user account with google account

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