RE: Problem in Block composition

> -----Original Message-----
> From: Harvinder Singh [mailto:[email protected]]
> Sent: 28 October 2004 18:49
> To: Avalon framework users
> Subject: Problem in Block composition
> 
> Hi All,
> 
> I am facing a problem regarding block composition.
> I have 3 blocks, an empty block.xml, BlockA.xml and BlockB.xml having
the
> entries of some components.
> I am embedding Merlin and instantiating the kernel with an empty
> block.xml,
> which just has the following entry:
> 
> <container name="XXX">
> </container>

Just for reference - a container declaration in the kernel is the root
container and if you don't include any container definition you will get
the same as what you are declaring above by default.

> Once my kerlnel gets initialized properly, I then add a containment
model
> like :
> 
> URL blockUrl = new URL("location of BlockA.xml");
> ContainmentModel ContainerA =
> ((ContainmentModel)m_root).addContainmentModel(blockUrl);
> ContainerA.commission();
> 
> blockUrl = new URL("location of BlockB.xml");
> ContainmentModel ContainerB =
> ((ContainmentModel)m_root).addContainmentModel(blockUrl);
> ContainerB.commission();
>
> Now my containerA gets commissioned properly but containerB does not
get
> commisioned since it is having some components which are dependent
upon
> components present in containerA. It gives me an error :
> Unable to assemble component: [/ServiceContainer/ComponentX] due to a
> service provider establishment failure.


What you should be doing is add BlockA, then add Block B, then
commission the root container.

Cheers, Steve.