uh, oh. I don't think this will work after a server reboot. You will, I think,
have to think about storing info in a database, or if the info is not too
complicated, maybe in a flat file on the server ..
Geeta
Carl Woermann wrote:
> 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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