Hi The "New Documentation!" news item http://appfuse.org/display/APF/2008/05/13/New+Documentation%21 recommended the article "AppFuse: Igniting your applications with AppFuse": http://www.ociweb.com/jnb/jnbMay2008.html
That article has a useful reference to the relevant chapter of "Effective Java" regarding implementation of equals() and hashCode() methods - I hadn't realised that text was available online. http://java.sun.com/developer/Books/effectivejava/Chapter3.pdf However, the article then fails to follow the book's advice, with code like this in the hashCode() implementation: result = (description != null ? description.hashCode() : 0); result = result * (int)hours; result = result * (project != null ? project.hashCode() : 0); Notice that any 0 or null encountered will give a result of 0. Following Joshua Bloch's advice in the book, this should be rewritten (taking into account the fact that the hours field is a double): result = (description != null ? description.hashCode() : 0); long hoursBits = Double.doubleToLongBits(hours) result = 37 * result + (int)(hoursBits ^ (hoursBits >>> 32)); result = 37 * result + (project != null ? project.hashCode() : 0); regards Justin Forder -- View this message in context: http://www.nabble.com/Bad-hashCode-implementation-in-OCIWeb-%22-Igniting-your-applications-with-AppFuse%22-article-tp19011861s2369p19011861.html Sent from the AppFuse - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
