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Date: Tue, 24 Nov 2009 09:42:43 -0800
From: Jonathan Gold <jgold.bg@gmail.com>
To: Maven Users List <users@maven.apache.org>
Subject: Re: Why would 'mvn dependencies:tree' fail while 'mvn compile' works?
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Jamie --

My adversion to running 'mvn clean install' is just that I'd prefer not to have
to build and install something just to be able to examine its dependencies.
Indeed, this problem came up originally as I was configuring a new project and
trying to do sort of a dry run to understand where things would be coming from
under various 3rd party dependency scenarios. It seems backwards to me to have
to first build and install something only to be able to examine some abstract
properties of it, so that's my main blocker.

I'm finding this same pattern (need to activate the reactor) with the eclipse
plugin, which also seems odd to me, since I effectively have to install a
project before I can add it to an eclipse workspace where, presumably, I would
actually be doing the work to get it to a point where there is something to
install.

If there is some more maven-ey way to go about this stuff, I'm all for it.

jon

On Fri, Nov 20, 2009 at 01:42:27PM -0800, Jamie Whitehouse wrote:
> Yes, thanks for clarifying Brian.
> 
> Jon, I'm still wondering why you're adverse to running mvn clean install? 
> 
> -----Original Message-----
> From: Jonathan Gold [mailto:jgold.bg@gmail.com] 
> Sent: Friday, November 20, 2009 4:26 PM
> To: users@maven.apache.org
> Subject: Re: Why would 'mvn dependencies:tree' fail while 'mvn compile' works?
> 
> Brian --
> 
> Thanks for this. I did run the combo 'mvn compile dependency:tree' as you mention below, and it works. What I'm taking away from this is that dependency:tree will work if it's part of the *same* mvn invocation as something like compile, which forces maven to do the resolution of the local workspace.
> Doing 'mvn compile' and then 'mvn dependency:tree' thus does not work.
> 
> As a new user, this was (and still is) a bit bizarre, but I'm happy to know how to get it to work. 
> 
> Thanks!
> 
> jon
> 
> On Fri, Nov 20, 2009 at 03:54:11PM -0500, Brian Fox wrote:
> > This isn't exactly true. First, lets take a look at the stack trace:
> > 
> > ----------
> > 1 required artifact is missing.
> > 
> > for artifact:
> >   com.example:mod_b:jar:1.0
> > 
> > from the specified remote repositories:
> >   mynexus (http://192.168.101.21:8081/nexus/content/groups/public)
> > 
> > 
> >         at 
> > org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTra
> > nsitively(DefaultArtifactResolver.java:360)
> >         at 
> > org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTra
> > nsitively(DefaultArtifactResolver.java:304)
> >         at 
> > org.apache.maven.plugin.DefaultPluginManager.resolveTransitiveDepende
> > ncies(DefaultPluginManager.java:1499)
> >         at 
> > org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPlugi
> > nManager.java:442)
> >         at 
> > org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa
> > ultLifecycleExecutor.java:694)
> >         ... 17 more
> > 
> > 
> > Notice this is all core code. It's trying to resolve the dependencies 
> > prior to invoking the plugin. As I mentioned earlier in the thread, 
> > the plugin sets @requiresDependencyResolution test which tells Maven 
> > to resolve the test scope (which means everything) before invoking the 
> > plugin.
> > 
> > If you only run "mvn dependency:tree" there are no references to the 
> > other projects in the reactor for Maven to find and use. Try running 
> > "mvn compile dependency:tree: and you'll see that it does in fact 
> > work. This is just a side effect of how maven 2.x does the resolution.
> > 
> > Could we rewrite the dependency tree goal to completely work around 
> > this? Probably, but it would mean duplicating tons of core logic to 
> > make the resolution work in all cases and running tree on a not-yet 
> > compiled or installed project is an edge case imo.
> > 
> > 
> > 2009/11/19 Jamie Whitehouse <Jamie.Whitehouse@genesyslab.com>:
> > > Many of the dependency plugin goals are reactor aware, but dependency:tree isn't.  I'm not too sure why, but you could search the issue tracker and if there's no issue for this file one.
> > >
> > > -----Original Message-----
> > > From: Jonathan Gold [mailto:jgold.bg@gmail.com]
> > > Sent: Thursday, November 19, 2009 3:00 PM
> > > To: users@maven.apache.org
> > > Subject: Re: Why would 'mvn dependencies:tree' fail while 'mvn compile' works?
> > >
> > > Jamie --
> > >
> > > Thanks for trying it out, and for the explanation. This makes sense in terms of why things are happening, so that's nice.
> > >
> > > I'm not familiar with the dependency plugin developers (are you one?), and wonder if having the dependency plugin be reactor-aware is something they would consider? Perhaps its an old tired discussion and the decision to build that plugin the way it is is said and done.
> > >
> > > Thanks for your help!
> > >
> > > jon
> > >
> > > On Thu, Nov 19, 2009 at 11:43:33AM -0800, Jamie Whitehouse wrote:
> > >> What maven commands did you issue to test this?
> > >>
> > >> I used the attached project and here's the results.
> > >> 1) extract zip
> > >> 2) mvn dependency:tree
> > >>   failed due to dependency resolution
> > >> 3) mvn clean install
> > >> 4) mvn dependency:tree
> > >>   see the tree output
> > >>
> > >> I think you're misunderstanding how the local maven repo is used and the affect reactor builds and plugins that are reactor aware vs not.  AFAIK the dependency:tree goal is not reactor aware.  It needs to resolve artifacts from the local repo (or download from remote repos if not present locally).  Since you haven't mvn installed these into your local repo the tree goal states that the artifact is missing.
> > >>
> > >> The compile goal is reactor aware, and hence if you invoke mvn compile it determines the correct order in your multi-module build in order for mod_b to resolve the reference to mod_a.  To test this reverse the order of the module definitions in the root pom and see that the reactor summary builds mod_a first despite the modules list having mod_b first.
> > >>
> > >> If you want to simulate what dependency:tree does using the compile goal, just try to compile mod_b on it's own, in it's own sub module (e.g. c:\maven-repro1\mod_b> mvn compile ), you'll get the same error about not being able to resolve dependencies.
> > >>
> > >> Hope that helps.
> > >> Jamie.
> > >>
> > >> -----Original Message-----
> > >> From: Jonathan Gold [mailto:jgold.bg@gmail.com]
> > >> Sent: Thursday, November 19, 2009 12:52 PM
> > >> To: users@maven.apache.org
> > >> Subject: Re: Why would 'mvn dependencies:tree' fail while 'mvn compile' works?
> > >>
> > >> Brian --
> > >>
> > >> Thanks for your help so far. I did put together a very small sample project that will repro what I'm seeing (attached as a zip). Just run 'mvn dependency:tree'
> > >> in the root of the project and see if you get the same error (mod_a is not found, required by mod_b). It does compile fine.
> > >>
> > >> I'll be interested to see if you get the same results, or have some insights.
> > >> It's totally likely that I'm not setting my poms up correctly.
> > >>
> > >> Thanks for any help you can give!
> > >>
> > >> jon
> > >>
> > >> On Wed, Nov 18, 2009 at 05:53:34PM -0500, Brian Fox wrote:
> > >> > This is not related. The dependency plugin has some issues 
> > >> > resolving things from the reactor and ranges in the following goals only:
> > >> > copy
> > >> > unpack
> > >> > go-offline
> > >> > resolve-plugins
> > >> >
> > >> >
> > >> > All the other goals set @requiresDependencyResolution test which 
> > >> > will cause Maven to resolve all dependencies prior to the plugin running.
> > >> > So if you're seeing some error, it's happening in the core. 
> > >> > Provide a sample project and/or some debug output and we might be 
> > >> > able to tell what the problem is.
> > >> >
> > >> >
> > >> > On Wed, Nov 18, 2009 at 12:59 PM, Stevo Slavić <sslavic@gmail.com> wrote:
> > >> > > Likely because dependency plugin has bugs, and I'm suspecting 
> > >> > > that your issue is similar/related to this 
> > >> > > <http://jira.codehaus.org/browse/MDEP-204>one already reported.
> > >> > >
> > >> > > But it's odd that it doesn't fail for you at module mod_c, as 
> > >> > > build reactor should have ordered mod_c to be built/processed 
> > >> > > before mod_d. Just guessing, maybe this mojo doesn't use maven 
> > >> > > reactor at all, and probably mod_c is ordered in list of modules in your parent module after mod_d.
> > >> > >
> > >> > > Regards,
> > >> > > Stevo.
> > >> > >
> > >> > > On Wed, Nov 18, 2009 at 6:37 PM, Jonathan Gold <jgold.bg@gmail.com> wrote:
> > >> > >
> > >> > >> Hi --
> > >> > >>
> > >> > >> I'm trying to track down some other depdendency issues in my 
> > >> > >> project using dependencies:tree, but am getting errors that a module isn't found.
> > >> > >>
> > >> > >> I have my project set up with a parent pom and a list of 
> > >> > >> modules, each referencing the parent, etc. Essentially, I have this:
> > >> > >>
> > >> > >>    pom.xml # parent, references mods a, b, c, d in <modules>
> > >> > >>    mod_a/pom.xml # module, no module dependencies
> > >> > >>    mod_b/pom.xml # module, no module dependencies
> > >> > >>    mod_c/pom.xml # module, declared dependency on mod_b
> > >> > >>    mod_d/pom.xml # module, declared depdenency on mod_a, 
> > >> > >> mod_b, mod_c
> > >> > >>
> > >> > >> From the root workspace directory, I can run things like 'compile'
> > >> > >> or 'jar:jar'
> > >> > >> just fine, but for some reason 'dependencies:tree' is failing 
> > >> > >> when it gets to mod_d, complaining that it can't find mod_c.
> > >> > >>
> > >> > >> Any ideas what I'm doing wrong?
> > >> > >>
> > >> > >> jon
> > >> > >>
> > >> > >> --------------------------------------------------------------
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