Session maintenance with j2ee generated stub

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posted 18 years ago

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Hello,

I am trying to maintain state between a JSE endpoint and a servlet that acts as a client.

Here is the code for the client:

/*
 * addClient.java
 *
 * Created on May 22, 2006, 8:44 PM
 */
 
package pack;
 
import java.io.*;
import java.net.*;
 
import javax.servlet.*;
import javax.servlet.http.*;
import javax.xml.rpc.Stub;
 
/**
 *
 * @author julien
 * @version
 */
public class AddClient extends HttpServlet {
    
    /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try { // This code block invokes the add operation on web service
            int sum = getAdderWebServiceSEIPort().add(4);
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet addClient</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet addClient at " + sum + "</h1>");
            out.println("</body>");
            out.println("</html>");
            out.close();
            
        } catch(java.rmi.RemoteException ex) {
            // TODO handle remote exception
        } catch(Exception ex) {
            // TODO handle custom exceptions here
        }
    }
    
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
    
    private pack.AdderWebService getAdderWebService() {
        pack.AdderWebService adderWebService = null;
        try {
            javax.naming.InitialContext ic = new javax.naming.InitialContext();
            adderWebService = (pack.AdderWebService) ic.lookup("java:comp/env/service/AdderWebService");
            
        } catch(javax.naming.NamingException ex) {
            ex.printStackTrace();
        }
        return adderWebService;
    }
    
    private pack.AdderWebServiceSEI getAdderWebServiceSEIPort() {
        pack.AdderWebServiceSEI adderWebServiceSEIPort = null;
        try {
            Stub stub;
            adderWebServiceSEIPort = getAdderWebService().getAdderWebServiceSEIPort();
            stub = (Stub)adderWebServiceSEIPort;
            stub._setProperty(javax.xml.rpc.Stub.SESSION_MAINTAIN_PROPERTY, true);
            adderWebServiceSEIPort= (pack.AdderWebServiceSEI)stub;
        } catch(javax.xml.rpc.ServiceException ex) {
            ex.printStackTrace();
        }
        return adderWebServiceSEIPort;
    }
}

and here is the code for the JSE endpoint:

package pack;
 
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import javax.xml.rpc.ServiceException;
import javax.xml.rpc.handler.soap.SOAPMessageContext;
import javax.xml.rpc.server.ServiceLifecycle;
import javax.xml.rpc.server.ServletEndpointContext;

/**
 * This is the implementation bean class for the AdderWebService web service.
 * Created May 22, 2006 8:30:25 PM
 * @author julien
 */
public class AdderWebServiceImpl implements AdderWebServiceSEI, ServiceLifecycle{
    
    ServletEndpointContext endptCtx;
    SOAPMessageContext msgCtx;
    
    /**
     * Web service operation
     */
    public int add(int number) throws java.rmi.RemoteException {
        System.out.println("add called");
        
         HttpSession session = endptCtx.getHttpSession();
         System.out.println("SESSION ID "+session.getId());
        
        if(session !=null){
            
            System.out.println("session not null");
            String idFromClient = msgCtx.getProperty("id").toString(); System.out.println("----"+idFromClient);
            String id = (String)session.getAttribute("id"); System.out.println("----"+id);
            
            if (id!= null && idFromClient.equals(id)){
                System.out.println("nested non null");
                int total = (Integer)session.getAttribute("total") + number;
                session.setAttribute("total",total);
                return  total;
            } else{
                System.out.println("nested null");
                session.setAttribute("id", idFromClient);
                int total = number;
                session.setAttribute("total",total);
                System.out.println("here"+session.getAttribute("id"));
                return total;
            }
            
        } else{
            System.out.println("session null");
            return 0;
        }
    }
    
    public void init(Object context) throws ServiceException {
        System.out.println("init called");
        endptCtx = (ServletEndpointContext) context;
        msgCtx = (SOAPMessageContext)endptCtx.getMessageContext();
    }
    
    public void destroy() {
        System.out.println("destroy called");
    }
 
   
    
}

Here is the output from the console:

1:53:47,692 INFO  [AxisService] Web Service deployed: <a href="http://ordinateur:8080/WebApplicationFiveEndpoint/AdderWebService" target="_blank" rel="nofollow">http://ordinateur:8080/WebApplicationFiveEndpoint/AdderWebService</a>
01:53:48,720 INFO  [STDOUT] session Created
01:53:57,708 INFO  [STDOUT] init called
01:53:57,769 INFO  [STDOUT] org.jboss.axis.message.SOAPHeaderElementAxisImpl@1aa34dc[[mi:message-id: null]]
01:53:57,769 INFO  [STDOUT] 123456789
01:53:57,774 INFO  [STDOUT] add called
01:53:57,774 INFO  [STDOUT] session Created
01:53:57,775 INFO  [STDOUT] SESSION ID B15EEC235A416BE62D36192EAEB8AA88
01:53:57,775 INFO  [STDOUT] session not null
01:53:57,776 INFO  [STDOUT] ----123456789
01:53:57,776 INFO  [STDOUT] ----null
01:53:57,776 INFO  [STDOUT] nested null
01:53:57,778 INFO  [STDOUT] here123456789
01:53:57,792 INFO  [STDOUT] destroy called
01:54:04,027 INFO  [STDOUT] init called
01:54:04,042 INFO  [STDOUT] org.jboss.axis.message.SOAPHeaderElementAxisImpl@19ab9c5[[mi:message-id: null]]
01:54:04,042 INFO  [STDOUT] 123456789
01:54:04,043 INFO  [STDOUT] add called
01:54:04,044 INFO  [STDOUT] session Created
01:54:04,044 INFO  [STDOUT] SESSION ID 1C0770F2DF80971FC59F54DE3CCBBCE0
01:54:04,044 INFO  [STDOUT] session not null
01:54:04,044 INFO  [STDOUT] ----123456789
01:54:04,045 INFO  [STDOUT] ----null
01:54:04,045 INFO  [STDOUT] nested null
01:54:04,045 INFO  [STDOUT] here123456789
01:54:04,082 INFO  [STDOUT] destroy called

As you can see, I have enabled session maintenance and still it does not work. FYI, I use Jboss 4.0.3. Can anyone help please??

Thanks in advance,

Julien.

wise owen

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posted 18 years ago

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int sum = getAdderWebServiceSEIPort().add(4);

Then every time you will create a new stub. You may need to keep it for each httpsession.

Julien Martin

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posted 18 years ago

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Hello Wise Owen,
Thanks for taking the time to reply. I can't figure out what to change in my code in order for it to work. How do I keep the stub for each httpsession? Can you be so kind as to give me a code sample?
Julien.

wise owen

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posted 18 years ago

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In processRequest(...)

...
HttpSession session = request.getSession();

pack.AdderWebServiceSEI ws = session.getAttribute("AdderWebServiceSEI");
if (ws == null) {
ws = getAdderWebServiceSEIPort();
session.setAttribute("AdderWebServiceSEI", ws);
}
....

Julien Martin

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posted 18 years ago

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thanks a lot wise owen.