This helps u to understand the keyword super: http://java.sun.com/docs/books/tutorial/java/IandI/super.html
On Fri, Jun 25, 2010 at 8:03 PM, Donald Whytock <[email protected]> wrote: > It is now. :P Yes, thanks, that solves the runtime. Still, any ideas > about the compiletime? Did I absolutely have to create the > constructor in my extension because ServiceTracker doesn't have a > no-argument constructor? > > On Fri, Jun 25, 2010 at 1:53 PM, khepel lak <[email protected]> wrote: >> Is your context argument != null ? >> >> On Fri, Jun 25, 2010 at 7:21 PM, Donald Whytock <[email protected]> wrote: >>> >>> One of the ServiceTracker constructors takes a Filter, but not a >>> filter String. Still, it shouldn't complain at compile time about >>> (BundleContext, String, null) as parameters regardless of whether I'm >>> using a bad String. >>> >>> My extension was called ShellTracker. I'd extended ServiceTracker >>> without making a constructor, assuming it'd use ServiceTracker's >>> constructors. So the statement that wouldn't compile was >>> >>> tracker = new ShellTracker(context, filterstring, null); >>> >>> I tried adding a constructor: >>> >>> Public ShellTracker(BundleContext context, String clazz, >>> ServiceTrackerCustomizer custom) >>> { super(context, clazz, custom); } >>> >>> That compiled, but at runtime it gave me a NullPointerException when >>> instantiating the ShellTracker. >>> >>> On Fri, Jun 25, 2010 at 12:57 PM, Richard S. Hall <[email protected]> >>> wrote: >>> > On 6/25/10 12:50, Donald Whytock wrote: >>> >> >>> >> Hi...Trying to extend ServiceTracker rather than use a >>> >> ServiceTrackerCustomizer, but when I try new ServiceTracker(context, >>> >> filter, null) I get a Cannot Find Symbol for constructor >>> >> ServiceTracker(BundleContext, String,<nullable>). >>> >> >>> >> The ServiceTracker javadoc talks about what happens if the customizer >>> >> parameter is null, so I assume it can be null? >>> >> >>> > >>> > Sure it can. Are you sure you have access to the class in your project set >>> > up? >>> > >>> > -> richard >>> > >>> > p.s. The middle string parameter is not a filter, but the name of a >>> > class...if you want to use a filter you need to create a filter. >>> > >>> >> Don >>> >> >>> >> --------------------------------------------------------------------- >>> >> To unsubscribe, e-mail: [email protected] >>> >> For additional commands, e-mail: [email protected] >>> >> >>> >> >>> > >>> > --------------------------------------------------------------------- >>> > To unsubscribe, e-mail: [email protected] >>> > For additional commands, e-mail: [email protected] >>> > >>> > >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: [email protected] >>> For additional commands, e-mail: [email protected] >>> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [email protected] >> For additional commands, e-mail: [email protected] >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
