What can possibly go wrong with Maven

Hi,

I'm trying to collect everything that can go wrong inside Maven so  
that it can be clearly pointed out to a user. We currently have a  
mechanism that analyzes stack traces, isn't localized, and is not  
very friendly for embedding as everything is couched in the form of  
console output. Here's the list that I came up with so far and I want  
to make to make a mechanism that says exactly what's wrong.

Anyone have anything else? I'm not trying to consider everything that  
happens in plugins. I've identified almost all the places where those  
errors occur and I would like them to surface at the top in a form  
that is useful to embedding. As a by product it's easy to produce  
console output for the CLI. I don't care if the try/catch is a mile  
long it's going to tell users exactly what happened when something  
goes wrong. I've pushed all console logging out of DefaultMaven and  
into the CLI. Moved the monitor into the core, but we still have  
console-centric logging in a bunch of the major components which I  
should be able to purge by the release of 2.1-alpha-1.

Here's the list:

- bad command line parameter
- malformed settings
- malformed POM
- local repository not writable
- remote repositories not available
- artifact metadata missing
- extension metadata missing
- extension artifact missing
- artifact metadata retrieval problem
- version range violation
- circular dependency
- artifact missing
- artifact retrieval exception
- plugin metadata missing
- plugin metadata retrieval problem
- plugin artifact missing
- plugin artifact retrieval problem
- plugin dependency metadata missing
- plugin dependency metadata retrieval problem
- plugin configuration problem
- plugin execution failure due to something that is know to possibly  
go wrong (like compilation failure)
- plugin execution error due to something that is not expected to go  
wrong (the compiler executable missing)

Thanks,

Jason

----------------------------------------------------------
Jason van Zyl
Founder and PMC Chair, Apache Maven
jason at sonatype dot com
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