All,
Further to discussions on standardising the POM, i mailed Jose Cronembold,
the specification lead for jsr 198 about what the plans are for a
standardised project model.
Jose kindly allowed me to republish his responses on this list. Apologies in
advance for any misrepresentation I've done of Maven.
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My first mail to Jose:
hi,
i've been working with maven (maven.apache.org) some time and recently there
has been some discussion on the mailing list about standardizing the project
object model. while maven is for the most part a plugin driven build
manager, it behaves a great deal like a headless ide. there seem to be
parallels between what maven does and what JSR 198 is trying to standardise
(at least in respect of non-ui functionality). while we could just wait for
the public draft, it would be useful to have some idea of the direction the
standard is taking and to what extent maven can conform to it, so here are
some questions:
- has maven been considered in regards to jsr 198?
- if so, do you have any thoughts to the interoperability of the two (i.e.
could maven plugins be wrapped up as headless jsr 198 plugins and vice
versa)?
- is there any advanced information available to make integration easier?
- is a "project model" being standardised in jsr 198 (i.e. where all the
sources, dependencies, tests, resources, etc. for a project are).
thanks,
jamie mccrindle.
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Jose's Response:
Hi Jamie,
> - has maven been considered in regards to jsr 198
> - if so, do you have any thoughts to the interoperability of the two (i.e.
> could maven plugins be wrapped up as headless jsr 198 plugins and vice
> versa)?
>From what I gather Maven seems to be a build management
system that can be customized through plugins. The project object
model seems to control the build process.
Early on, the jsr 198 expert group defined the scope of
the jsr and specifying the build system fell out of the current scope.
We are specifying a project model.
I can see how Maven can be a plugin to Java IDEs, but it is not
clear if it makes sense for Maven's pluging to plug into an IDE
without Maven.
It may also be difficult for a jsr 198 plugin to easily plug into Maven
since these plugins generally have GUI hooks into an IDE.
> - is there any advanced information available to make integration easier?
Currently, the specification is in its early stages and still evolving.
Nothing has
yet been made public.
> - is a "project model" being standardised in jsr 198 (i.e. where all the
> sources, dependencies, tests, resources, etc. for a project are).
Yes, jsr 198 is standarizing the in-memory project model but not how
that model is persisted.
Jose R. Cronembold
Oracle Corporation
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My Reply:
hi Jose,
thanks for the reply. do you mind if i forward this to the maven list, as
i'm sure there are mavenites who would find this discussion useful?
maven gets much of it's power from internally standardising it's project
model, hence our discussion on standardising it. since jsr 198 already
proposes to do this (runtime only), it would be interesting to explore
whether this project model can be adapted to jsr 198 and what level of
integration we could expect (there was talk of non-ui jsr 198 plugins that
can run under both Swing and SWT). it may make more sense just to expose
maven as a whole as a plugin to an ide but since they do share project
models there may be scope for deeper integration.
any idea when we'll see a public draft? is the final version still on track
for the end of 2003?
thanks,
jamie.
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His response:
Hi Jamie,
> thanks for the reply. do you mind if i forward this to the maven list, as
> i'm sure there are mavenites who would find this discussion useful?
No problem.
> maven gets much of it's power from internally standardising it's project
> model, hence our discussion on standardising it. since jsr 198 already
> proposes to do this (runtime only), it would be interesting to explore
> whether this project model can be adapted to jsr 198 and what level of
> integration we could expect (there was talk of non-ui jsr 198 plugins that
> can run under both Swing and SWT). it may make more sense just to expose
> maven as a whole as a plugin to an ide but since they do share project
> models there may be scope for deeper integration.
We have not yet finalized the project model specification. The areas that
we will be covering include:
- Source Path
- Class Path
- Output Directory (where .class files are generated).
- How plugin specific data is held by a project (this data are generally
project specific settings associated with a plugin and that end users
can change through a project settings dialog).
> any idea when we'll see a public draft? is the final version still on
track
> for the end of 2003?
Probably by the begining of next year.
Jose R. Cronembold
Oracle Corporation
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My last reply:
hi Jose,
> We have not yet finalized the project model specification.
> The areas that
> we will be covering include:
>
> - Source Path
> - Class Path
> - Output Directory (where .class files are generated).
> - How plugin specific data is held by a project (this data
> are generally
> project specific settings associated with a plugin and
> that end users
> can change through a project settings dialog).
>
Are the dependencies going to be modelled at all (jars, zips, other projects
etc?)
regards,
jamie.
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