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I am able to set session attribute in scriptlet but when I am trying to set session attribute inside java class it shows error like "session cannot be resolved". So how to set session in java?
<%String username = (String)request.getAttribute("un"); session.setAttribute("UserName", username);%> 
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The client can create session attributes in a request by calling either the PostContent or the PostText operation with the sessionAttributes field set to a value. A Lambda function can create a session attribute in a response.
One servlet can create session variables and other servlets can fetch or change the value of session variables. Servlet must be a sub class of HttpServlet. Use set attribute method of Httpsession to create session variables. Use getAttribute() of Httpsession to find value of session variables.
setAttribute. Binds an object to this session, using the name specified. If an object of the same name is already bound to the session, the object is replaced. After this method executes, and if the new object implements HttpSessionBindingListener , the container calls HttpSessionBindingListener.
var strTest=document. getElementById('DropDownList1'). value; <%Session["Test"] = "'+ strTest +'";%> var session_value='<%=Session["Test"]%>'; alert(session_value);
By Java class, I am assuming you mean a Servlet class as setting session attribute in arbitrary Java class does not make sense.You can do something like this in your servlet's doGet/doPost methods
public void doGet(HttpServletRequest request, HttpServletResponse response) { HttpSession session = request.getSession(); String username = (String)request.getAttribute("un"); session.setAttribute("UserName", username); } By default session object is available on jsp page(implicit object). It will not available in normal POJO java class. You can get the reference of HttpSession object on Servelt by using HttpServletRequest
HttpSession s=request.getSession() s.setAttribute("name","value"); You can get session on an ActionSupport based Action POJO class as follows
ActionContext ctx= ActionContext.getContext(); Map m=ctx.getSession(); m.put("name", value); look at: http://ohmjavaclasses.blogspot.com/2011/12/access-session-in-action-class-struts2.html
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