Problem in passing an Arraylist from JSP to action class

[anonymous10]

I am setting an attribute in my JSP and access the attribute in my action class. I end up getting a null pointer exception.

In my JSP I do

<%
request.setAttribute("messageList", aMsgList);
System.out.println("Before for loop. Size =" +aMsgList.size());
<li> <A href="inboxMsg.do?Id=<%=i%>"><%=aTaskId%><%=aTaskMsg%></A></li>
%>

My struts config is as follows
<action
path="/inboxMsg"
type="com.abcd.def.actions.InboxAction">
<forward name="success" path="/WEB-INF/jsp/inboxmessage.jsp"/>
<forward name="failure" path="/WEB-INF/jsp/failure.jsp"/>

</action>



In my action class I try to read my arraylist as follows

ArrayList MsgList = (ArrayList) request.getAttribute("messageList");
int anIndex=Integer.parseInt(request.getParameter("Id"));
System.out.println("Size of Message List=" + MsgList.size());


When the last line is executed I get a null pointer exception.

I would be grateful for any suggestions.

 

[Rhoon]

<%
request.setAttribute("messageList", aMsgList);
System.out.println("Before for loop. Size =" +aMsgList.size());
<li> <A href="inboxMsg.do?Id=<%=i%>"><%=aTaskId%><%=aTaskMsg%></A></li>
%>

Could you show us how you are defining aMsgList please?