Felix DS has very very extensive logging but it uses an OSGI logging service. So you need to install one to get any output. For instance the DS integration tests install a simple logger.
A DS component is only one class. You can't spread the methods into more than one class and have one component, such as the activate/deactivate in one class and the reference bind/unbind methods in another. An exception in the activate method will prevent the component from being set up. If I've understood your setup you have a mandatory dependency from one class. DS will only try to create the implementation object after all the required dependencies are present. Not having all the required dependencies is in no sense an error condition. Even so if you have logging set up there are numerous debug level messages explaining that dependencies are missing so activation cannot proceed. hope this helps david jencks On May 29, 2013, at 2:40 AM, Snorre Lothar von Gohren Edwin <[email protected]> wrote: > Im sorry if this is not clear at all, but il try to answer these questions > and that might help. > As for the null object, it was a object that had not be set yet, or existed > but not yet created. That was a silly mistake from my side, probably copy > paste error, but the IDE didnt see anything wrong with the code. > > *1) What am I trying to achieve;* > First of all im just trying out OSGi, so basically, im trying to achieve an > understanding of the why and how. > But in this current question im trying to achieve a DS component that > activate and deactivate, with the possibility to bind and unbind. > I did solve some problems I didn't understand yesterday, and that is why I > sent the mail. > In the end im trying to make a Java gui which will be a container for GUIs > that comes with the services. And it should deliver messages to the service > frame and should get messages from the service frame. > Basically its a control station for other services to register and they > should be able to communicate. This is probably best done with the > whiteboard pattern, if I have understood correctly? > > *2) What did I try to do;* > > 1) I tried to activate a bundle which had a simple sysout, and the objecet > was accidentely null. This was a mistake because of a copy paste probably. > But this stopped the code. > 2) I also started over from scratch to try to get the service to bind. Then > I figuered out that I had to have the implementation resolved to for > anything to happen. Now im just curious why. > 3)I also tried to put the bind and unbind methods in another class, a class > that would be created from the class with the activate method. But this > seems to cause some problems. > > > *3) What did I *expect* to see as the result of doing (2);* > > 1) I expected at least some message back from the framework on the null > mistake, a nullpointer excetion. > 2) As this attempt. I registered the interface but forgot the > implementation. Its logical that the setMethod(Reference) didn't go off. > But still im used to some kind of error message or warning. > 3)As for the setting the bind and unbind in another class, I expected the > bind and unbind methods to trigger, I also tried to put the bind methods > inside the class with the activate method, and then it worked. > > *4) What did I *actually* see as a result of doing (2);* > > 1) I didn't get any exceptions at all, it just started my bundle like > everything was ok. Except it was like it never ran the activate method. > I know its silly but alot of time was used to understand why the activate > method didn't start, at least that what I thought it didn't, but since this > sysout of the object that was unfortunately null, it was the first line, it > stopped without any exceptions. > 2) Also here nothing happened, but again im used to some kind of error > message or warning, but this was actually silly. > 3) This one is a little more confusing, nothing happens here. I create the > new class, but the bind(@Reference) wont trigger in this class. Its > probably some kind of settings mistake but I havent figured it out yet. > > *5) Why do I believe that what actually happened is wrong?* > I don't think I said it was wrong but as I have mentioned a couple of > times, im used to getting some kind of error or warning. Unresolved > warning, nullpointer exception or something to work out from. > But the framework didn't give me anything which was frustrating to work > with. And the mail to that thread was basically to mention that I as a > newbie, felt that it was some warnings missing when I figured out what the > mistakes were. > > Hopes this helps understanding my questions and inquiries. > > > -- > Mvh > Snorre Lothar von Gohren Edwin > +47 411 611 94 --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
