Thats awesome thanx, makes real sense now :) cheers sion
Pete Gould wrote: > > Hi, > > Serialization is used to save an object's state as a sequence of bytes (In > clustered web applications this is crucial for failover of the HttpSession > to another server in the cluster). > > I think this article explains it all fairly well, even if it is a little > old: > > http://java.sun.com/developer/technicalArticles/Programming/serialization/ > > The article below discusses some ways of using Serialization judiciously > (mainly with respect to WebSphere, but it has some good ideas): > > http://www-128.ibm.com/developerworks/websphere/library/bestpractices/httpsession_performance_serialization.html > > serialVersionUID: > > You don't have to explicitly define a serialVersionUID (although I'd > reccommend you do - see below), but if you don't then any changes to your > class will result in the class being incompatible with previously > serialized > versions of the object. > > If you define a serialVersionUID, then class compatibility is assumed. You > should only ever need to change the serialVersionUID if changes to your > class will make it incompatible. These are discussed in the first linked > article: > > "Compatible changes include adding or removing a method or a field. > Incompatible changes include changing an object's hierarchy or removing > the > implementation of the Serializable interface. A complete list of > compatible > and incompatible changes is given in the Java Serialization > Specification." > > Hope that's some help! > > Cheers, > > Pete > > > On 2/20/07, sionsmith <[EMAIL PROTECTED]> wrote: >> >> >> hi all, i'm not new to Java or Jsf but i am a little confused about when >> i >> should be implementing java.io.Serializable >> >> Throughout the appfuse project Matt implements Serializable and i cant >> figure out why, i've never used this method before, i gather any class >> which >> implements it has to have a serialVersionUID... how does this make the >> object / Bean different... i dont get it? >> >> Any info or links where this is explained clearly would be very greatful >> :) >> >> thanks Sion >> -- >> View this message in context: >> http://www.nabble.com/When-to-use-java.io.Serializable-tf3257850s2369.html#a9057324 >> Sent from the AppFuse - User mailing list archive at Nabble.com. >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > > -- View this message in context: http://www.nabble.com/When-to-use-java.io.Serializable-tf3257850s2369.html#a9060059 Sent from the AppFuse - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
