jsp:useBean problem

[Rohit Bhagwat]

Hello friends

I am using Tomcat 5.

In servlet I wrote the following code

public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException
{
foo.mybean mb=new foo.mybean();
mb.setName("Universe");

foo.mybean mb1=new foo.mybean();
mb1.setName("World");

request.setAttribute("obj",mb1);
request.getSession().setAttribute("obj",mb);

request.getRequestDispatcher("/useBean.jsp").forward(request,response);
return;
}

Now in useBean.jsp I wrote the following code

<jsp:useBean id="obj" class="foo.mybean" scope="session"/>
<jsp:getProperty name="obj" property="name"/>

In foo.myBean I have just a getter and setter method for setting and getting the name..

Now I was expecting to get the output "Universe" but was shocked to see that I was getting "World" as output despite of me setting the scope to "session" in <jsp:useBean> tag !!

Is this a bug in Tomcat 5 or I am misunderstood ?

Please help me ..
Waiting for your replies..

Thanks and Regards
Rohit
[ February 25, 2005: Message edited by: Bear Bibeault ]

[William Brogden]

You should look at the Java code that the Jasper compiler turned your JSP page into for the answer. I think that will be found under the work directory.

[David Ulicny]

try this

  
<jsp:useBean id="obj" class="foo.mybean" scope="session">
   <jsp:getProperty name="obj" property="name"/>
</jsp:useBean>
 

[Rohit Bhagwat]

<jsp:useBean id="obj" class="foo.mybean" scope="session">
<jsp:getProperty name="obj" property="name"/>
</jsp:useBean>

The above code will not work as the object obj already exists in session and if the obj exists in the scope specified then the code inside the useBean never executes..So this will not help

I saw the code in the work directory and there I saw that tomcat is using the method findAttribute() for finding the attribute and since findAttribute goes on finding the obj from page scope to application scope thats why it gets the object from request so it doesnt search in session scope which is one level above request scope..

Thats y I said I think it is tomcat 5 bug !!

Waiting for your reply
Thanks and Regards
Rohit.

[William Brogden]

If you can find a statement in the Servlet/JSP specifications that says that the session scope should be searched before page scope then you have found a bug. Otherwise not - since Tomcat is the reference implementation of the specification, I doubt you will find that statement.
http://java.sun.com/products/servlet/reference/api/index.html
Bill

[Ben Souther]

Originally posted by William Brogden:
If you can find a statement in the Servlet/JSP specifications that says that the session scope should be searched before page scope then you have found a bug.

I can't find anything about "searching the various scopes" for an object. Everything I'm reading indicates that the object will be looked for in the scope specified in the "scope" attribute.

Rohit,
I ran this code in 5.0.28 and I'm seeing the same behaviour that you described. I'm going to try in a more recent version and continue reading the spec.

William,
If you can point out a section in the JSP spec that clears this up, I would be most grateful.

-Ben
[ February 26, 2005: Message edited by: Ben Souther ]

[Ben Souther]

And...
this thread should be in the Tomcat forum.

[David Ulicny]

Try to use type instead of class in jsp:useBean.