On Thu, Feb 21, 2008 at 7:01 PM, Rodrigo Madera <[EMAIL PROTECTED]> wrote:
> Classpaths and OSGi spell tricky when on the same sentence. > Indeed! :) > > How do you *search *for classes in your class loading mechanism? Using a list of urls pointing to the plugin jars, we create a URLClassLoader. As I understand things, this adds all classes in the jars to the search path for that ClassLoader. Once we've got the URLClassLoader, we open each jar, read the manifest which tells us which class we should be looking for, and call loadClass on that class name. thanks, Mike > > > Rodrigo > > On Fri, Feb 22, 2008 at 2:58 AM, Mike Smoot <[EMAIL PROTECTED]> wrote: > > > I'm not sure I understand the question, but once we get a Class object > > from > > the ClassLoader given a name, we call newInstance() on it. Then it's up > > to > > the plugin to do it's thing. > > > > Or are you asking how we get the ClassLoader in the first place? We do > > that > > by creating a URLClassLoader with a list of urls that point to the > plugin > > jar files. > > > > Or are you asking something else? > > > > thanks, > > Mike > > > > On Thu, Feb 21, 2008 at 6:45 PM, Rodrigo Madera < > [EMAIL PROTECTED]> > > wrote: > > > > > What algorithm does your class loading use? > > > > > > Regards, > > > Rodrigo > > > > > > On Fri, Feb 22, 2008 at 2:40 AM, Mike Smoot <[EMAIL PROTECTED]> > > wrote: > > > > > > > Hi, > > > > > > > > I'm working on migrating an existing swing application ( > > > > http://cytoscape.org) > > > > to OSGi using Felix. With the help of bnd, I've gotten everything > > > running > > > > about how it should, with the exception of our legacy plugin > > mechanism. > > > > The > > > > way the old plugin mechanism works is that a plugin jar file (but > not > > a > > > > bundle) is read and we then call ClassLoader.loadClass() on a class > > > found > > > > in > > > > the jar file. The problem is that with Felix I get a > > > NoClassDefFoundError > > > > when I try to load the class. I'm assuming this is because none of > > the > > > > packages defined in the plugin jar are found by Felix since the > plugin > > > > jars > > > > aren't bundles or loaded as such. > > > > > > > > Now, I've managed to work around this problem in two cases. First > is > > > > using > > > > Equinox, which I'm not terribly keen on using. Second is by running > > bnd > > > > on > > > > each plugin jar, loading them as bundles, jumping through a few > hoops > > to > > > > get > > > > the correct ClassLoader, and then loading the class. The problem > with > > > the > > > > second approach is that I have to wrap all plugins before anything > > will > > > > work. I'd very much like to avoid this requirement (for now) > because > > > this > > > > will only work with plugins that I have and not those developed by > > > users. > > > > > > > > Can anyone provide any guidance on loading classes that aren't part > of > > > > bundles? Is this possible with Felix? I apologize if this is a bit > > > > vague, > > > > but I'm still very new to OSGi. > > > > > > > > thanks, > > > > Mike > > > > > > > > -- > > > > ____________________________________________________________ > > > > Michael Smoot, Ph.D. Bioengineering Department > > > > tel: 858-822-4756 University of California San Diego > > > > > > > > > > > > > > > -- > > ____________________________________________________________ > > Michael Smoot, Ph.D. Bioengineering Department > > tel: 858-822-4756 University of California San Diego > > > -- ____________________________________________________________ Michael Smoot, Ph.D. Bioengineering Department tel: 858-822-4756 University of California San Diego
