How to pass an ArrayList from one jsp to another using session

Question

I'm trying to pass an ArrayList from handle.jsp to main.jsp, but it doesn't let me do it. It keeps saying "Type mismatch: cannot convert from Object to ArrayList".

main.jsp:

<%@ page import="java.util.ArrayList" %>
<html>
<body>
    <h1>Hobby Manager</h1>
<%

        ArrayList<String> hobbies = session.getAttribute("hobbies");

        out.println(hobbies.size());

        out.println(session.getAttribute("hobbies"));
%>

    <h2>Add new hobby!</h2>

    <FORM action="handleAddHobby.jsp" method="get">
            What new hobby are you wishing to add? <INPUT TYPE=text name=hobbyName /> <br/>

            <INPUT TYPE=submit name=addHobby value="Add Hobby" />

    </FORM>

</body>
</html>

handle.jsp:

<%@ page import="java.util.ArrayList" %>
<html>
<body>

<%
    ArrayList<String> hobbies = new ArrayList<String>();

    String hobbyName = request.getParameter("hobbyName");

    if(hobbyName == null){
            out.println("Please enter a hobby before clicking add! Dummy.<br/>");
    }   
    else{
            hobbies.add(hobbyName);

            for(int index = 0; index < hobbies.size(); index ++){
                    out.println(hobbies.get(index) + "<br/>");
            }   

            session.setAttribute("hobbies", hobbies);
    }   
%>

</body>
</html>

I have tried passing it as a string object, and passing it as an object alone but nothing seems to work.

Answer 1

the problem is here ..

ArrayList<String> hobbies = session.getAttribute("hobbies");

Try typecasting it as getAttribute always returns Object.

ArrayList<String> hobbies = (ArrayList<String>)session.getAttribute("hobbies");

How to pass an ArrayList from one jsp to another using session

Question

1 answers

solution1
4 ACCPTED 2014-02-06 01:31:24

How to pass an ArrayList from one jsp to another using session

Question

1 answers

solution1 4 ACCPTED 2014-02-06 01:31:24

solution1
4 ACCPTED 2014-02-06 01:31:24