Servlet passing values to JSP and ClasscastException

I am using weblogic 5.1 to run my Servlets.
          I want to know when I forward from a servlet to a JSP how do I pass
          values especially Java Objects (Sometimes Objects of User written Java
          classes).
          Uptil now I have been putting all values in the session from where the
          JSP picks them up, but somehow I have a feeling that this is not the
          right way.
          In a code I am putting a Java Object (It contains two attributes of
          Java.util.Vector type) in the session so that the JSP to which I am
          forwarding it to can use it I have put my class in the ServletClasses.
          Intertestingly it runs well till the contents of the Vector are changed.
          As the contents of the vector are changed, it throws ClassCastException
          The StackTrace is as follows:
          java.lang.ClassCastException
          at
          jsp_servlet._select_95_account_95_profile._jspService(_select_95_account_95_pro
          file.java, Compiled Code)
          at weblogic.servlet.jsp.JspBase.service(JspBase.java, Compiled
          Code)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java,
          C
          ompiled Code)
          at
          weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.j
          ava:143)
          at
          com.logistics.optistopasp.servlet.AccountSelectServlet.doPost(AccountSelectServ
          let.java, Compiled Code)
          at
          com.logistics.optistopasp.servlet.AccountSelectServlet.doGet(AccountSelectServl
          et.java:35)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java,
          C
          ompiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.j
          ava, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.j
          ava, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextMan
          ager.java, Compiled Code)
          at
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java,
          Compile
          d Code)
          at
          weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java,
          Compiled Code
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java,
          Compiled Code)
          Can anybody please Help!!!!.
          Thanks
          Pankaj

Only can confirm your finding - the jsp is using a different class loader to the servlet that originally instantiated the object. There's the rub. I haven't figured out yet how to fix that. I can get the classloader but don't know how to get the runtime to use that class loader to perform cast.

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Servlet passing Values to JSP

I want to know when I forward from a servlet to a JSP how do I pass
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          classes).
          Uptil now I have been putting all values in the session from where the
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          Suppose my servlet is forwarding to a jsp . What should it do in case an
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You could probably use setAttribute
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          pankaj wrote:
          > I want to know when I forward from a servlet to a JSP how do I pass
          > values especially Java Objects (Sometimes Objects of User written Java
          > classes).
          > Uptil now I have been putting all values in the session from where the
          > JSP picks them up, but somehow I have a feeling that this is not the
          > right way.
          > Suppose my servlet is forwarding to a jsp . What should it do in case an
          > exception happens in the servlet and wants to forward it to the jsp.
          > Putting the Exception object in the session is an alternative but I
          > wonder that is the best approach.
          > If someone knows a better way od doing it, please help.
          >
          > Pankaj

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regards
SwarnaDeepika
P.S:Please reward points for helpful answers.

Passing values between jsp pages

Hi all,
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Let me post the code here and make my point clear. I have 3 jsp pages and am trying to get the value into my 3rd page that was in the first page.
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<%@page contentType="text/html"%>
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Thanks

Hi,
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What i think i am missing is the basic idea to doing this way. So if you could let me know how to do this using java classes I would really appreciate it. If its too much to explain can u point to some good source(URL's) that explain's this. I have searched on this and all i find is code with no good explaination.
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Pass value between JSP pages

I would like to pass values between pages.
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I don't feel it's safe.
It's not coming from form either....
How can I hide the value and pass it to next page?
I want to pass the value when the user click on a hyperlink
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Message was edited by:
Theepan

Client side information is never safe no matter what you do. If the values don't end up in the url, they are always present SOMEWHERE in the html content.
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here's the source to two very simple jsps that do what you want..
<HTML>
<HEAD>
<TITLE>
ForwardValue
</TITLE>
</HEAD>
<BODY>
<H1>
Go To GetValue.jsp
</H1>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE>
GetValue
</TITLE>
</HEAD>
<BODY>
<H1>
<%= request.getParameter("value") %>
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</BODY>
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That's JSF.
You may find this article useful: http://balusc.xs4all.nl/srv/dev-jep-com.html

Servlet passing values to JSP and ClasscastException

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