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

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i'm trying pass arraylist handle.jsp main.jsp, doesn't let me it. keeps saying "type mismatch: cannot convert object 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">             new hobby wishing 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 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 string object, , passing object alone nothing seems work.

the problem here ..

arraylist<string> hobbies = session.getattribute("hobbies");

try typecasting getattribute returns object.

arraylist<string> hobbies = (arraylist<string>)session.getattribute("hobbies");

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