Hi Carl, I am also looking for same thing. I have written a bean for counter. I want to serialise this bean to a file so that on server restart i should be able to get the last count . Currently I am explicitily writing it in file using stream . I want to use object serialisation. I have ' implements serialisable' but yet not clear when and what method will be called when server is being stopped.
pl. shed some light on it. with regards, Avinash -----Original Message----- From: A mailing list for discussion about Sun Microsystem's Java Servlet API Technology. [mailto:[EMAIL PROTECTED]]On Behalf Of Carl Woermann Sent: Wednesday, February 05, 2003 10:33 PM To: [EMAIL PROTECTED] Subject: Using serialization to re-/store state: UnknownServiceException: protocol doesn't support output: 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
