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you are right, &nbsp; my problem was the page redirection and i have the solution but thanks for your response. 
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you are right,   my problem was the page redirection and i have the solution but thanks for your response.

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Hi friends,<br />
<br />
&nbsp; &nbsp; I have an application on JSP and i do login on the a frame when i want do click on the other frame and read the variable session writing on the first frame, the variable is null. &nbsp; How i do for manipulate the variable session on three frames?
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Hi friends,

    I have an application on JSP and i do login on the a frame when i want do click on the other frame and read the variable session writing on the first frame, the variable is null.   How i do for manipulate the variable session on three frames?

How i do for manipulate the variable session on tree frames

JavaServer Pages (JSP) allow the development of dynamically generated web pages. It uses the Java programming language; JSP pages are translated into servlets at runtime, with each servlet being cached and reused until the JSP is modified. JSP allows Java code to be interleaved with static web markup content, so the resulting page can be compiled and executed on the server to deliver the content.