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Username existence check using AJAX and Java J2EE

 
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Hi. iam working on a web application using Struts,Spring and hibernate.
I want to check whether the username already exist in the database or not.

Iam new to Ajax and Struts. I don't know that whether i should create a new java class(AJAX validation) or just club the same in the existing struts action class of registeration ?
I would really appreciate you guys if could send me its code.
Following is my struts action class :-



applicationContext.xml:-


struts-config.xml:-


Thanks in advance
 
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