Using lookupService()

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Hello!

I'm trying to find a service that I advertised on another peer, using
PeerGroup.lookupService(). Since that doesn't work, I have some questions:

1. I like to publish the advertisements inside a new group. All examples
I found (mostly in the book by Brendon J. Wilson) use the net peer
group's discovery service to publish the advertisements, not the group
they create. Shouldn't they/I use newgroup.getDiscoveryService()?

2. I can't find the service implementation. I create the class adv, spec
adv and impl adv for the service and according to the examples I've
seen, only the class and spec advs are published. The implementation adv
is added to the group's parameters (using StdPeerGroupParamAdv etc.).
Since I cannot find this advertisement, shouldn't it be published along
with the others?

3. Something strange: I have 2 example services doing nothing, just
printing log statements on startApp(), init() and so on. I create and
treat both the same, but one service is always started (without using
it), i.e. I get log messages from init() and startApp(), but the other
one isn't. When are init() and startApp() called?

4. [Maybe related to 3.] Do I have to call newgroup.startApp() after
creating a new group to start the services? And must/should I join this
group, or am I joining it automatically?

Sorry to bother with so many questions, but I'm "punishing" google for
quite a while now and can't find answers. Also most examples use JXTA
2.0 or 2.1, and it seems there were changes since then.

thanks for all answers!
greetings,
Daniel
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