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,
-------------------------------------------------------------------------------
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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