can someone tell me why I get this error when I try to run the template project ?
Details in line.
I run the merlin command as such:
<PROJECT DIRECTORY>/template/impl$ merlin -execute target/classes
You problem appears to be that you are using "merlin" instead of "merlinx". The "merlin" command defaults to the avalon repository whereas merlinx defaults to the maven repository.
Try the following:
$ merlinx -execute target/classes
and I get:
But there are a few things in the trace that's don;t make sense.
More inline ....
---- exception report ---------------------------------------------------------- Exception: org.apache.avalon.merlin.KernelException Message: Install failure: file:/opt/projects/ps/template/impl/target/template-impl-1.0.jar
This does not make a lot of sense relative to the command line. You command line is setting the deployment target to the target/classes directory. As such template-impl-1.0.jar is being referenced. I'm going to assume that the stack trace was a result of running something like:
$ merlin -execute target/classes/template-impl-1.0.jar
---- cause --------------------------------------------------------------------- Exception: org.apache.avalon.composition.model.ModelException Message: Unable to create block from embedded descriptor [jar:file:/opt/projects/ps/template/impl/target/template-impl-1.0.jar!/BLOCK-INF/block.xml] in the containmment model [/] due to a build related error.
So merlin is reading in this jar file and looking for the deployment descriptor under the default location BLOCK-INF/block.xml but it is having a problem.
---- cause --------------------------------------------------------------------- Exception: org.apache.avalon.composition.model.ModelException Message: Could not create classloader.
Ok, so Merlin could not create a classloader relative to the classloader declared in the block.xml file.
---- cause --------------------------------------------------------------------- Exception: org.apache.avalon.repository.RepositoryException Message: Failed to download artifact to local cache file /home/korosh/.avalon/repository/template/jars/template-api-1.0.jar from hosts: http://dpml.net/ http://www.ibiblio.org/maven/
And the reason is that Merlin could not find the template-api-1.0.jar in you local repository. As mentioned above, using merlinx is a useful way of running merlin relative to the maven repository. But also keep in mind that when you have problems like this, switch in -info to see what assumptions merlin is making about repositories, caches, etc.
E.g. merlin -info ...
---- cause --------------------------------------------------------------------- Exception: java.io.IOException Message: Connection returned a null input stream: http://www.ibiblio.org/maven/template/jars/template-api-1.0.jar
This exception message could be improved - what it means is that the /template-api-1.0.jar at the address supplied does not exist. What we should do is to improve the exception reporting to throw something like a file not found exception referencing the local cache and the fallback hosts.
why does merlin try to download the template api jar into my local cache from ibiblio ?
Only if the resource is not found in you cache. And in your example you cache is at ${avalon.home}/repository/... but the resource only exist in the maven repository.
I guess I am a bit fuzzy on how the repository works with merlin. I have looked at maven documentation and realize how its main repository mechanism works.
Merlin maintains a separate repository form Maven mainly because of conflicts that arrive when development objectives and deployment objectives conflict. But you can manage this by either using merlinx, or using the -repository parameter to declare that the default repository to use is the maven repo.
Hope that clears things up.
Cheers, Steve.
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