AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  override eroor          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Daniel Guest Posted: Fri Jun 17, 2005 7:14 am    Post subject: override eroor I want to implement rmi and get this error test/PatientGui.java [151:1] getEnToonData() in test.PatientGui cannot override getEnToonData() in test.ViewModel; overridden method does not throw java.rmi.RemoteException Public class PatientGui void getEnToonData() throws java.rmi.RemoteException { : } Public Class ViewModel void getEnToonData() { System.out.println("Moet nog gemaakt worden in de sub-class"); } If i remove the throws java.rmi.RemoteException, the compiler tells me it should be thrown. How can i solve this? Thanks Daniel Back to top Fred L. Kleinschmidt Guest Posted: Fri Jun 17, 2005 2:50 pm    Post subject: Re: override eroor Daniel wrote: Quote: I want to implement rmi and get this error test/PatientGui.java [151:1] getEnToonData() in test.PatientGui cannot override getEnToonData() in test.ViewModel; overridden method does not throw java.rmi.RemoteException Public class PatientGui void getEnToonData() throws java.rmi.RemoteException { : } Public Class ViewModel void getEnToonData() { System.out.println("Moet nog gemaakt worden in de sub-class"); } If i remove the throws java.rmi.RemoteException, the compiler tells me it should be thrown. How can i solve this? Thanks Daniel Show us how you REALLY coded this, not the incomplete typing above (as you show it here, there is no overridden method, since neither class extends the other). As it is, we can only guess what mistakes you might have made. -- Fred L. Kleinschmidt Boeing Associate Technical Fellow Technical Architect, Common User Interface Services M/S 2R-94 (206)544-5225 Back to top Dale King Guest Posted: Sat Jun 18, 2005 1:42 am    Post subject: Re: override eroor Daniel wrote: Quote: I want to implement rmi and get this error test/PatientGui.java [151:1] getEnToonData() in test.PatientGui cannot override getEnToonData() in test.ViewModel; overridden method does not throw java.rmi.RemoteException Public class PatientGui void getEnToonData() throws java.rmi.RemoteException { : } Public Class ViewModel void getEnToonData() { System.out.println("Moet nog gemaakt worden in de sub-class"); } If i remove the throws java.rmi.RemoteException, the compiler tells me it should be thrown. How can i solve this? The issue is not specific to RemoteException, but with your design not allowing for the possibility of unexpected behavior. Your ViewModel says that it cannot throw a checked exception which RemoteException is and that it must return data. What you need to think about is what is supposed to happen if a subclass of ViewModel encounters a failure and can't actually get the EnToonData? Should it ignore any errors and return data anyway? This is usually not desired, but if so you would have to catch the exception in the subclass and return something. Should it throw an unchecked (aka run-time) exception? In this case you would catch the exception in the subclass and throw a runtime exception (one that does not extend Exception). If you are using 1.4 or later you would probably want to use the chained exception facility to point to the RemoteException (see <http://java.sun.com/j2se/1.5.0/docs/guide/lang/chained-exceptions.html>). The most likely scenario is that your design should account for the fact that this method can throw excpeptions and declare that the method in ViewModel can throw a checked exception that users of that method have to handle. This should not be RemoteException because that ties you to RMI. You probably want to make your own exception class and declare that it throws that. Your subclass would then do like the previous case except that you use this exception class rather than the runtime exception. -- Dale King Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java Help All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.