Hi, It seems that plugin-loading code is somehow broken. There is some discussion going on about this on http://www.nabble.com/forum/ViewPost.jtp?post=10844164&framed=y .
On 6/5/07, Enzo Michelangeli <[EMAIL PROTECTED]> wrote: > I have a question about the loading mechanism of plugin classes. I'm working > with a custom URLFilter, and I need a singleton object loaded and > initialized by the first instance of the URLFilter, and shared by other > instances (e.g., instantiated by other threads). I was assuming that the > URLFilter class was being loaded only once even when the filter is used by > multiple threads, so I tried to use a static member variable of my URLFilter > class to hold a reference to the object to be shared: but it appears that > the supposed singleton, actually, isn't, because the method responsible for > its instantiation finds the static field initialized to null. So: are > URLFilter classes loaded multiple times by their classloader in Nutch? The > wiki page at > http://wiki.apache.org/nutch/WhichTechnicalConceptsAreBehindTheNutchPluginSystem > seems to suggest otherwise: > > Until Nutch runtime, only one instance of such a plugin > class is alive in the Java virtual machine. > > (By the way, what does "Until Nutch runtime" mean here? Before Nutch > runtime, no class whatsoever is supposed to be alive in the JVM, is it?) > > Enzo > > -- Doğacan Güney ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Nutch-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/nutch-general
