Ok.. thanks I'll give it a try. This is one of my first attempts at servlets/jsp, so I'm using plain java principles here.
PS. Where does the data then get stored? In the original bean? Thanks CARL. -----Original Message----- From: A mailing list for discussion about Sun Microsystem's Java Servlet API Technology. [mailto:[EMAIL PROTECTED]]On Behalf Of Geeta Ramani Sent: 05 February 2003 07:19 To: [EMAIL PROTECTED] Subject: Re: Using serialization to re-/store state: UnknownServiceException:protocol doesn't support output: 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 > > __________________________________________________ > Do You Yahoo!? > Everything you'll ever need on one web page > from News and Sport to Email and Music Charts > http://uk.my.yahoo.com > > ___________________________________________________________________________ > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff SERVLET-INTEREST". > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > Resources: http://java.sun.com/products/servlet/external-resources.html > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
