Re: Using serialization to re-/store state: UnknownServiceException:protocol doesn't support output:

Hi Geeta;
I've looked at it, but I I think I should have been more specific: the
persistance I was hoping to achive was after server reboot.. so I suppose I
should try application.setAttribute("myData", myBean); etc?

Thanks CARL.



Hi Carl:

I am not sure, maybe I misunderstand your problem, but aren't you working
too
hard? Why don't you use session variables here? As in:

Save your bean data as follows:
session.setAttribute("myData", myBean);

And then when you want the data later, retrieve it as follows:
MyBean myBean = (MyBean)session.getAttribute("myData");

In case this will do it for you, you may want to know that sessions have
bene
extensively discussed in the archives...:)
Geeta

Carl Woermann wrote:

> Hi all..
>
> I'm using jsp & tomcat4.
> The application collects user data.
> I have a bean that contains all relevant data.
> I am using serializtion to make the data persistant.
> In order to restore the state of the bean I use:
>
> <% URL resourceUrl =
> application.getResource("/resource/SerializedBean.ser"); %>
>
> // returns a valid url: jndi:/localhost/resource/MemberBean.ser
>
> <jsp:useBean  id="registrationBean" scope="application"
> type="Package.class" beanName="Package.SerializedBean" >
> <%
>  // the saved version is restored if there is no instance of this bean.
>  boolean bool = registrationBean.restoreState(registrationBean,
> resourceUrl);
>  out.print("restored state: " + bool); //for debugging purposes..
> %>
> </jsp:useBean>
>
> When saving the state with:
>
> registrationBean.saveState(resourceUrl);
>
> I get the following exception report:
>
> Starting service Tomcat-Netbeans
> Apache Tomcat/4.0.4
> restoring state : jndi:/localhost/resource/MemberBean.ser
> saving state to : jndi:/localhost/resource/MemberBean.ser
> can do output: true */ SEE METHOD CALL BELOW /*
> java.net.UnknownServiceException: protocol doesn't support output
>         at java.net.URLConnection.getOutputStream(URLConnection.java:679)
>                 etc...
>
> the code of the save state method is below:
>
> public synchronized void saveState(URL url){
>         this.url = url;
>         try {
>         URLConnection uConn = url.openConnection();
>         uConn.setDoOutput(true);
>         if (debug)
>             { System.out.println("can do output: " +
uConn.getDoOutput()); }
>
>                 OutputStream out = uConn.getOutputStream();
>             ObjectOutputStream s = new ObjectOutputStream(out);
>             s.writeObject(this);
>             s.flush();
>             s.close();
>          uConn.setDoOutput(false);
>         }
>         catch(FileNotFoundException fnfex){ fnfex.printStackTrace(); }
>         catch(IOException ioe){ ioe.printStackTrace(); }
>     }
>
> Can anybody shed some light on this problem?
> What other means are availiable to make beans persistant within a Servlet
> Container?
>
> Any suggestions are greatly appreciated.
>
> Thank you
> CARL WOERMANN
>
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