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servlet error building
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mark smith
Ranch Hand
Joined: Apr 05, 2005
Posts: 240
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hi
i have a jsp who call this servlet
my user class
my student_menu.jsp
when pType = 0 student_menu is called
i get the error
any idea?
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Christophe Verré
Sheriff
Joined: Nov 24, 2005
Posts: 14672
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Try to put the class in a package
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[My Blog]
All roads lead to JavaRanch
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satishkumar janakiraman
Ranch Hand
Joined: May 03, 2004
Posts: 334
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Hi,
and change your jsp page
bye for now
sat 
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mark smith
Ranch Hand
Joined: Apr 05, 2005
Posts: 240
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ok work fine.....
in myLogin.java file i do:
user.setUserName(pUserName);
System.out.println("1 - pUserName" + user.getUserName());
i get the correct value...
in my student_menu.jsp file i do
Bonjour
<%= user.getUserName() %>
i get null
any idea
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Christophe Verré
Sheriff
Joined: Nov 24, 2005
Posts: 14672
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You set the bean in the request scope:
request.setAttribute("user",user);
but get it back in the session scope:
<jsp:useBean id="user" class="User" scope="session"/>
A new bean is created, that is why the name is null.
Replace the scope with "request"
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mark smith
Ranch Hand
Joined: Apr 05, 2005
Posts: 240
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Originally posted by Satou kurinosuke:
You set the bean in the request scope:
request.setAttribute("user",user);
but get it back in the session scope:
<jsp:useBean id="user" class="User" scope="session"/>
A new bean is created, that is why the name is null.
Replace the scope with "request"
if i replace scope by request, i forwarded to errorlogin.jsp
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Christophe Verré
Sheriff
Joined: Nov 24, 2005
Posts: 14672
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Did you set the package name to retrieve your bean ?
<jsp:useBean id="user" class="mypackage.User" scope="request"/>
[ March 08, 2006: Message edited by: Satou kurinosuke ]
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mark smith
Ranch Hand
Joined: Apr 05, 2005
Posts: 240
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Originally posted by Satou kurinosuke:
Did you set the package name to retrieve your bean ?
<jsp:useBean id="user" class="mypackage.User" scope="request"/>
[ March 08, 2006: Message edited by: Satou kurinosuke ]
in my User.java i have
package mypack.test;
in student_menu.jsp
<jsp:useBean id="user" class="mypack.test.User" scope="session" />
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Christophe Verré
Sheriff
Joined: Nov 24, 2005
Posts: 14672
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A quick way to spot the problem would be to printout the stack trace in your catch clause (Login.java).
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mark smith
Ranch Hand
Joined: Apr 05, 2005
Posts: 240
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Originally posted by Satou kurinosuke:
A quick way to spot the problem would be to printout the stack trace in your catch clause (Login.java).
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Christophe Verré
Sheriff
Joined: Nov 24, 2005
Posts: 14672
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Let me confirm one thing :
Did you replace
<jsp:useBean id="user" class="mypackage.User" scope="session"/>
by
1. <jsp:useBean id="user" class="mypackage.User" scope="request"/>
or by
2. <jsp:useBean id="user" class="mypackage.User" request="session"/>
You should be using number one.
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mark smith
Ranch Hand
Joined: Apr 05, 2005
Posts: 240
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ok work now.....
i restarted eclipse... strange...
what i need to change to use: session instead request?
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Christophe Verré
Sheriff
Joined: Nov 24, 2005
Posts: 14672
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In Login.java, you have :
request.setAttribute("user",user);
which means that the user bean is in the request scope.
To get it back in your jsp file, you have to use <c:useBean> with the same scope, which is "request". If you use the "session" scope, you will not get your bean back.
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subject: servlet error building
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