Failed to find parameter:scriptSessionId

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• DWR has some extra code paths if you are using Reverse Ajax. (Are you?)
• Script sessions time out (by default) after 5 minutes of inactivity. New script sessions are then created on the next call. Could your problem be related to this "script session swap"?

• Try the latest snapshot (pre-RC2) version, downloadable from
  http://bugs.directwebremoting.org/bamboo/
• Log (f ex through Firebug or similar) the HTTP request contents for the request triggering the error + the request before that.

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From: Kalakota, Prudhvi [mailto:Prudhvi.Kalakota@...]
Sent: den 28 oktober 2009 08:03
To: users@...
Subject: [dwr-user] Failed to find parameter:scriptSessionId

Hi

 

 I am using DWR 3.0RC1. I am getting the following exception intermittently. I searched online for this issue and couldn’t find any solution.

 Suddenly the browser waits for response from the server for long time and throws the exception. If I refresh the page,

 everything starts working fine again.  This happens for different requests, not just a particular request.

 

Exception : java.lang.IllegalArgumentException_: Failed to find parameter: scriptSessionId

    at org.directwebremoting.dwrp.Batch.extractParameter( _Batch.java:91_)

    at org.directwebremoting.dwrp.Batch.<init>(_Batch.java:59_)

            at org.directwebremoting.dwrp.CallBatch.<init>(_CallBatch.java:46_)

    at org.directwebremoting.dwrp.BaseCallHandler.handle(_BaseCallHandler.java:72_)

    at org.directwebremoting.servlet.UrlProcessor.handle(_UrlProcessor.java:120_)

    at org.directwebremoting.servlet.DwrServlet.doPost(_DwrServlet.java:141_)

    at javax.servlet.http.HttpServlet.service(_HttpServlet.java:710_)

 

Obviously by looking at this exception, I understood that scriptSessionId is not sent to the server as a request parameter.

The application I am working is a web desktop (Extjs) and I have only one JSP page. All the javascript is loaded into that page. I am not sure why this is happening in the middle of nowhere. The application works fine most of the time after the page loads. After some time this exception is thrown and I have to refresh the browser to proceed. Any ideas on why this might be happening.

 

Here is a sample of my javascript

 

    <script type='text/javascript' src='/web/dwr/engine.js'> </script>

   <script type='text/javascript' src='/web/dwr/util.js'> </script>

   <script type='text/javascript' src='/web/dwr/interface/AuthenticationAction.js'></script>

   <script type='text/javascript' src='/web/dwr/interface/DataAuthAction.js'></script>

    --- lot more actions

 

 

     window.onload = function() {

          dwr.engine.setActiveReverseAjax(true);

          dwr.engine.setNotifyServerOnPageUnload(true);

     }

 

      window.onunload = function() {

            dwr.engine.setActiveReverseAjax(false);

     }

 

 My web.xml sample

 

            <filter-mapping>

                        <filter-name>SessionHandlerFilter</filter-name>

                        <url-pattern>*.jsp</url-pattern>

                        <url-pattern>*.dwr</url-pattern>

            </filter-mapping>

            <listener>

                        <listener-class>org.directwebremoting.servlet.DwrListener</listener-class>

            </listener>

              <servlet>

                        <servlet-name>dwr-invoker</servlet-name>

                       

                        <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>

 

                        <init-param>

                                    <param-name>debug</param-name>

                                    <param-value>true</param-value>

                        </init-param>

 

 

 

                        <init-param>

                                    <param-name>activeReverseAjaxEnabled</param-name>

                                    <param-value>true</param-value>

                        </init-param>

                        <init-param>

                                    <param-name>initApplicationScopeCreatorsAtStartup</param-name>

                                    <param-value>true</param-value>

                        </init-param>

                        <init-param>

                                    <param-name>maxWaitAfterWrite</param-name>

                                    <param-value>-1</param-value>

                        </init-param>

                       

                        <init-param>

                                    <param-name>org.directwebremoting.extend.ServerLoadMonitor</param-name>

                                    <param-value>org.directwebremoting.impl.PollingServerLoadMonitor</param-value>

                        </init-param>

 

                         <init-param>

                             <param-name>scriptSessionTimeout</param-name>

                             <param-value>1800000</param-value>

                        </init-param>

       

                        <init-param>

                                    <param-name>disconnectedTime</param-name>

                                    <param-value>30000</param-value>

                        </init-param>

 

                      <load-on-startup>1</load-on-startup>

            </servlet>

 

            <servlet-mapping>

                        <servlet-name>dwr-invoker</servlet-name>

                        <url-pattern>/dwr/*</url-pattern>

            </servlet-mapping>

 

            <session-config>

                        <session-timeout>30</session-timeout>

            </session-config>