AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Overriding (or something similar) Exceptions          AppletTalk.com Forum Index -> JVM, native methods and hardware View previous topic :: View next topic   Author Message graham.parsons@reflective Guest Posted: Mon Nov 13, 2006 11:33 pm    Post subject: Overriding (or something similar) Exceptions Hi guys, We have a "legacy" Java application that has been developed by many developers - some handle exceptions nicely, others not so. What I would like to do is create a log of all the exceptions and messages that are being thrown internally without changing the code. I was thinking around the classloader - create my own Exception class which uses the standard one but before passing the call to the standard one, writes out to the log. So mine is loaded by the JVM but all I do is extend the standard one and override a method - is this "cyclic dependancy possible"? If not, can anyone suggest any other route I could take to get the desired functionality? Cheers Graham Back to top Oliver Wong Guest Posted: Tue Nov 14, 2006 1:43 am    Post subject: Re: Overriding (or something similar) Exceptions <graham.parsons (AT) reflective (DOT) com> wrote in message news:1163439189.887227.93360 (AT) m7g2000cwm (DOT) googlegroups.com... Quote: Hi guys, We have a "legacy" Java application that has been developed by many developers - some handle exceptions nicely, others not so. What I would like to do is create a log of all the exceptions and messages that are being thrown internally without changing the code. I was thinking around the classloader - create my own Exception class which uses the standard one but before passing the call to the standard one, writes out to the log. So mine is loaded by the JVM but all I do is extend the standard one and override a method - is this "cyclic dependancy possible"? If not, can anyone suggest any other route I could take to get the desired functionality? Look into Aspect Oriented Programming, and AspectJ. - Oliver Back to top Tris Orendorff Guest Posted: Tue Nov 14, 2006 5:45 am    Post subject: Re: Overriding (or something similar) Exceptions "graham.parsons (AT) reflective (DOT) com" <graham.parsons (AT) reflective (DOT) com> burped up warm pablum in news:1163439189.887227.93360 (AT) m7g2000cwm (DOT) googlegroups.com: Quote: Hi guys, We have a "legacy" Java application that has been developed by many developers - some handle exceptions nicely, others not so. What I would like to do is create a log of all the exceptions and messages that are being thrown internally without changing the code. I was thinking around the classloader - create my own Exception class which uses the standard one but before passing the call to the standard one, writes out to the log. So mine is loaded by the JVM but all I do is extend the standard one and override a method - is this "cyclic dependancy possible"? If I understand you, you can do this. Exceptions and classes are very similar so you can say, "public class Mine extends IOException {}" and write a new constructor. You still have to change the code to use your new exceptions. So my second suggestion would be to add the logging code to the runtime library and whip up a special rt.jar file. -- Sincerely, Tris Orendorff [Q: What kind of modem did Jimi Hendrix use? A: A purple Hayes.] Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> JVM, native methods and hardware 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.