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Session in jsp problem
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Join Date: Aug 2009
Posts: 18
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Solved Threads: 0
Newbie Poster
Hello every one,
i m trying to use session in jsp application for remembering username from one page to another. it is working fine but when i use hyperlink to come back to home page the username becomes null.
please help me how to remember username when user is using hyperlink?
i m trying to use session in jsp application for remembering username from one page to another. it is working fine but when i use hyperlink to come back to home page the username becomes null.
please help me how to remember username when user is using hyperlink?
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Join Date: Dec 2007
Posts: 1,633
Reputation: 
Solved Threads: 222
If you put it in the session it shouldn't got away. You probably put it in the request, so better show some code.
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Join Date: Aug 2009
Posts: 18
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Newbie Poster
hello,
the code which i m using to display username on each page is:
this is first page code: content.jsp
this code i am using on the next page: view.jsp
with the help of hyper link i am trying to go back. but when i click on "Home" it is showing null as username on the content page.
the code which i m using to display username on each page is:
this is first page code: content.jsp
jsp Syntax (Toggle Plain Text)
this code i am using on the next page: view.jsp
jsp Syntax (Toggle Plain Text)
Last edited by peter_budo; Sep 4th, 2009 at 4:38 am. Reason: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks) and [icode] (inline code) tags.
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Join Date: Dec 2007
Posts: 1,633
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You are not suppose to change the username in the session. You put it once when you log in. You don't set it every time you load a page.
Of course it is null every time you do this:
If you don't pass the "username" as parameter in the request the first call will return null and then you will set null in the attribute.
The first call is completely useless if you have already put the username in the session after login.
So once you login put the username in the session and that's it. You don't need anything else. All you need to do next is get it from the session whenever you need it.
And after logout set it to null
Of course it is null every time you do this:
JSP Syntax (Toggle Plain Text)
If you don't pass the "username" as parameter in the request the first call will return null and then you will set null in the attribute.
The first call is completely useless if you have already put the username in the session after login.
So once you login put the username in the session and that's it. You don't need anything else. All you need to do next is get it from the session whenever you need it.
And after logout set it to null
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Join Date: Aug 2009
Posts: 18
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Newbie Poster
Hello JavaAddict,
I am passing you my loginpage, content page and view page full code.
please help me how to make session true everywhere, while using hyperlink also.
login.jsp
"content.jsp"
"view.jsp"
please help me.....
I am passing you my loginpage, content page and view page full code.
please help me how to make session true everywhere, while using hyperlink also.
login.jsp
jsp Syntax (Toggle Plain Text)
"content.jsp"
jsp Syntax (Toggle Plain Text)
"view.jsp"
jsp Syntax (Toggle Plain Text)
please help me.....
Last edited by peter_budo; Sep 4th, 2009 at 4:40 am. Reason: Please use code tags as[code]YOUR CODE HERE[/code]
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Join Date: Dec 2007
Posts: 1,633
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When the user logs in take the username and put it the session:
That's it. It's in the session. You don't need to put it every time you go to a page, because it's IN THE SESSION . Just get it and check if it is not null.
Also learn the difference between session and request, and what it means to put something inside each one of them.
Also when you logout do this:
These are the only two times where you will need to set the value of the session.
I didn't read your code nor will I ever read such un-formatted code.
JSP Syntax (Toggle Plain Text)
That's it. It's in the session. You don't need to put it every time you go to a page, because it's IN THE SESSION . Just get it and check if it is not null.
Also learn the difference between session and request, and what it means to put something inside each one of them.
Also when you logout do this:
JSP Syntax (Toggle Plain Text)
These are the only two times where you will need to set the value of the session.
I didn't read your code nor will I ever read such un-formatted code.
Last edited by javaAddict; Sep 4th, 2009 at 4:07 am.
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Join Date: Aug 2009
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Newbie Poster
hello javaAddict,
sorry to disturbe you, but as you suggested me the code like
[
request.getSession.getAttribute("username");
]
i tried this, but it is not working.
please check my this sample code.
Demosession.html
[
<<HTML>
<BODY>
<FORM METHOD=POST ACTION="DemoSession.jsp">
What's your name? <INPUT TYPE=TEXT NAME=username SIZE=20>
<P><INPUT TYPE=SUBMIT>
</FORM>
</BODY>
</HTML>
>
]
in this page i have written just input box and sending it to the next page DemoSession.jsp
[
<%
String name = request.getParameter( "username" );
session.setAttribute( "theName", name );
%>
<HTML>
<BODY>
Hello, <%=session.getAttribute("theName")%>
<A HREF="NextPage.jsp">Continue</A>
</BODY>
</HTML>
]
in this, i have given one link for another page and displaying the username.
Now from the NextPage.jsp, i am trying to come back to DemoSession.jsp and trying to display the username on NextPage.jsp.
code of NextPage.jsp is
[
<HTML>
<BODY>
Hello, <%= session.getAttribute( "theName" ) %>
<a href= "DemoSession.jsp">home</a>
</BODY>
</HTML>
]
In the above code everything is working fine, but when i click Home link on NextPage.jsp to come back at DemoSession.jsp the username is becoming null.
Please help me how to make it correct, so if user come back the username should not be null.
sorry to disturbe you, but as you suggested me the code like
[
request.getSession.getAttribute("username");
]
i tried this, but it is not working.
please check my this sample code.
Demosession.html
[
<<HTML>
<BODY>
<FORM METHOD=POST ACTION="DemoSession.jsp">
What's your name? <INPUT TYPE=TEXT NAME=username SIZE=20>
<P><INPUT TYPE=SUBMIT>
</FORM>
</BODY>
</HTML>
>
]
in this page i have written just input box and sending it to the next page DemoSession.jsp
[
<%
String name = request.getParameter( "username" );
session.setAttribute( "theName", name );
%>
<HTML>
<BODY>
Hello, <%=session.getAttribute("theName")%>
<A HREF="NextPage.jsp">Continue</A>
</BODY>
</HTML>
]
in this, i have given one link for another page and displaying the username.
Now from the NextPage.jsp, i am trying to come back to DemoSession.jsp and trying to display the username on NextPage.jsp.
code of NextPage.jsp is
[
<HTML>
<BODY>
Hello, <%= session.getAttribute( "theName" ) %>
<a href= "DemoSession.jsp">home</a>
</BODY>
</HTML>
]
In the above code everything is working fine, but when i click Home link on NextPage.jsp to come back at DemoSession.jsp the username is becoming null.
Please help me how to make it correct, so if user come back the username should not be null.
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•
Join Date: Dec 2007
Posts: 1,633
Reputation:
Solved Threads: 222
When you go back to the DemoSession.jsp this code is executed:
But this:
Also whenever you go to that page you need to make sure that you have submitted a field with name "username" or put it in the link as described.
Usually I don't get such a problem because I don't put these things together:
I put the setting of the session at a page before the homepage. So when I go to homepage I already have the session. And I don't return to the first page unless I have logged out.
You can also do this:
Example: if name is null and sessName not null you can do this:
name = sessName
Or put the name in the session only when it is not null.
JSP Syntax (Toggle Plain Text)
But this:
request.getParameter( "username" ) will return null since you didn't submit anything in the request. So you get null and you put null. There are ways to fix this but we generally don't do things that way. You could do this: JSP Syntax (Toggle Plain Text)
Usually I don't get such a problem because I don't put these things together:
JSP Syntax (Toggle Plain Text)
I put the setting of the session at a page before the homepage. So when I go to homepage I already have the session. And I don't return to the first page unless I have logged out.
You can also do this:
JSP Syntax (Toggle Plain Text)
name = sessName
Or put the name in the session only when it is not null.
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•
•
Join Date: Aug 2009
Posts: 18
Reputation:
Solved Threads: 0
Newbie Poster
@javaAddict,
Thanks javaAddict. this is working fine.
but as you suggested, i tried storing session first in login page only but the same error was coming so i tried to store it in the content page.
but i want to say thanks again!!!
Thanks javaAddict. this is working fine.
but as you suggested, i tried storing session first in login page only but the same error was coming so i tried to store it in the content page.
but i want to say thanks again!!!
0
#10 19 Days Ago
I have similar prob. The get attribute is null while the id is not null.
for my java:
Do i need to also use session.setAttribute(abc) in the jsp?
for my java:
java Syntax (Toggle Plain Text)
Do i need to also use session.setAttribute(abc) in the jsp?
Last edited by peter_budo; 19 Days Ago at 4:18 am. Reason: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks)
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