Hi.

29Dec2006 @ 11:02 pratapkm@(protected)
> We are planning to upgrade our Apache Tomcat server from 5.0.28 to
> 5.5.20. During this process, we found that one of the application is
> not working in apache-tomcat-5.5.20 which is working successfully
> without any problem in jakarta-Tomcat-5.0.28. Flow of the application
> is as follows:
>
> 1. A Java servlet is accessed which creates a bean using following code
>           MyBean mybean = new MyBean();
>   After populating this bean, it is added to session variable in the same
>   servlet using
>           session.setAttribute("whichbean",mybean);
>   and control is transfered to a jsp page.
>
> 2. In the JSP page, we are retrieving the bean object from session using
>   <%
>      MyBean bn = (MyBean) session.getAttribute("whichbean");
>   %>
>   But, after this in same JSP,
>   a) if we access <% bn.getName() %>, it returns correct result.
>   b) if we access the bean property using
>      <jsp:getProperty name="bn" property="name" />
>     it generates following error message,

Have you tried <jsp:useBean id="bn" scope="session" class="<packageName>.MyBean"/>
also: you may need a <jsp:import .../> statement.

HTH.

Kind regards.
Luke Vanderfluit.

> -------------------------------------------------------------------------------
> org.apache.jasper.JasperException: Attempted a bean operation on a
> null object.
> org.apache.jasper.servlet.JspServletWrapper.handleJspException (JspServletWrapper.java:512)
> org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:377)
>      
> org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:314)
>      org.apache.jasper.servlet.JspServlet.service (JspServlet.java:264)
>      javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
> root cause
> org.apache.jasper.JasperException: Attempted a bean operation on a
> null object.
>  
> org.apache.jasper.runtime.JspRuntimeLibrary.handleGetProperty (JspRuntimeLibrary.java:601)
>       org.apache.jsp.2_jsp._jspService(2_jsp.java:122)
>       org.apache.jasper.runtime.HttpJspBase.service (HttpJspBase.java:97)
>       javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
>  
> org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:334)
>      
> org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:314)
>       org.apache.jasper.servlet.JspServlet.service (JspServlet.java:264)
>       javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
> -------------------------------------------------------------------------------
>
> Why is it so ? What is the solution ?
>
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