> > > > [...]
> > > Building from the project root I get the same error you reported.
> > >
> > > This post of StackOverflow [1] indicates that this is a problem with
> > > running the shade plugin within a multi-phase command. It is related to
> > > dependency resolution when the shade plugin tried to incorporate all the
> > > classes in the final jar. If building all the classes it the same phase
> > > then it appears to break. If left to download them (as in my first
> > example)
> > > then it works.
> >
> > $ mvn verify
> > --> SUCCESS
> >
> > $ mvn verify site
> > --> SUCCESS
> >
> > $ mvn verify test site
> > --> FAILURE
> >
> > $ mvn test package verify site
> > --> SUCCESS
> >
>
> This is inconsistent to say the least. The bug MSHADE-215 [1] appears to
> indicate that running 'test package' will fail and running 'package' will
> succeed. Anyway it may be the same thing where adding the 'test' target
> somewhere in the set of targets causes the shade plugin to include classes
> using a directory but label them as a jar.
>
>
> [1] https://issues.apache.org/jira/browse/MSHADE-215
>
>
> >
> > I notice that junit runs in the "verify" phase; so, is the "test" phase
> > always redundant (before a commit)?
> >
>
> If running a target that is after 'test' in the lifecycle then yes, 'test'
> is redundant. If you use 'verify' you do not need 'test'. Adding 'test'
> appears to trigger a bug in the shade plugin using some combinations of
> targets later than 'test' from the default lifecycle.
>
>
> >
> > > I suggest the shaded jar is added within a profile and not on the default
> > > build. Thus you need to explicitly build the shaded jar.
> > >
> > > Is it the intention to release this artifact? Otherwise build on-demand
> > via
> > > a profile should solve this.
> >
> > Do you propose that the "commons-math-examples" not be part of the
> > official release?
> >
>
> Are they of value as a dependency to be used by others? If we release the
> standard jars from the examples modules then they can be included as a
> dependency and that will bring everything upstream with it to a project.
>
> The question is whether the shaded jar has value as a released artifact. I
> always considered them proof-of-application demos rather than programs that
> had far reaching utility.

I completely agree.  But how can we release (some official version of)
the project as source without also releasing the (convenience) binaries
for everything?

Regards,
Gilles

> > >
> > > [1] 
> > > https://stackoverflow.com/questions/37942689/maven-shade-plugin-reports-error-creating-shaded-jar-target-classes-is-a-d

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