You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@maven.apache.org by "Roger Huang (rchuang)" <rc...@cisco.com> on 2007/07/19 17:21:24 UTC
Setting jar order in maven.compile.classpath
How can I specify the order of jars in "maven.compile.classpath"? I
have two jars generated as part of my build that I need to explicitly
set the order of in maven.compile.classpath.
thanks,
Roger
Re: Setting jar order in maven.compile.classpath
Posted by Wayne Fay <wa...@gmail.com>.
A work-around for this problem which I've previously mentioned is roughly:
1. Figure out which classes are the problem
2. Figure out which jars contain those classes
3. Figure out which version of those classes you want to keep
4. Extract and re-jar the others "problem" jars minus the offending classes
5. Distribute those updated jars to the rest of your team via
Corporate Repo or similar
This is perhaps not ideal but it does allow you to "get past" the "problem".
If your problem jars are being supplied by a vendor, complain to them
and perhaps they will adopt a better policy regarding their Jars. If
your problem jars are being supplied by another dev team in your
organization, you should be able to get them to change the way they do
things or at least provide you with proper bundles that won't give you
problems like this.
Wayne
On 7/26/07, jaxzin <Br...@espn3.com> wrote:
>
> Thanks Manos,
> What I've found so far by looking at the source is that its dependent on how
> the Set that MavenProject.getArtifacts() orders itself. I still haven't
> found which impl of Set is used. That would tell us how predictable the
> order is. My guess is its a HashSet and so the order will be determined by
> the hashCode of the the Artifact object.
>
> Brian
>
>
>
> Manos Batsis wrote:
> >
> >
> >
> > Come on guys let us not give too much attention to eachother :-)
> >
> > I dont think Maven's behaviour regarding the order of JARs in the
> > classpath is random; that would be impossible.
> >
> > My guess is the order is predictable and based on the dependencies
> > configuration and the algorithm that goes over it. Something like
> >
> > 1) Scan explicit deps
> > 2) (Recursive?) Either
> > 2.A) For each one add it's deps and move to the next depth level OR
> > 2.B) Add each one, then process the next depth level of deps
> > 3) Remove the overridden versions
> >
> > This is pretty rough but you get the point. My bet is you will always
> > get the same classpath in a project whose POM does not change.
> >
> > This of course may not provide an easy solution to the OPs prob, but the
> > code is OS after all so anyone is free to modify it as needed and post
> > patches in the JIRA or whatever :-)
> >
> > Cheers,
> >
> > Manos
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> > For additional commands, e-mail: users-help@maven.apache.org
> >
> >
> >
>
> --
> View this message in context: http://www.nabble.com/Setting-jar-order-in-maven.compile.classpath-tf4111876s177.html#a11811974
> Sent from the Maven - Users mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> For additional commands, e-mail: users-help@maven.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
For additional commands, e-mail: users-help@maven.apache.org
Re: Setting jar order in maven.compile.classpath
Posted by jaxzin <Br...@espn3.com>.
Thanks Manos,
What I've found so far by looking at the source is that its dependent on how
the Set that MavenProject.getArtifacts() orders itself. I still haven't
found which impl of Set is used. That would tell us how predictable the
order is. My guess is its a HashSet and so the order will be determined by
the hashCode of the the Artifact object.
Brian
Manos Batsis wrote:
>
>
>
> Come on guys let us not give too much attention to eachother :-)
>
> I dont think Maven's behaviour regarding the order of JARs in the
> classpath is random; that would be impossible.
>
> My guess is the order is predictable and based on the dependencies
> configuration and the algorithm that goes over it. Something like
>
> 1) Scan explicit deps
> 2) (Recursive?) Either
> 2.A) For each one add it's deps and move to the next depth level OR
> 2.B) Add each one, then process the next depth level of deps
> 3) Remove the overridden versions
>
> This is pretty rough but you get the point. My bet is you will always
> get the same classpath in a project whose POM does not change.
>
> This of course may not provide an easy solution to the OPs prob, but the
> code is OS after all so anyone is free to modify it as needed and post
> patches in the JIRA or whatever :-)
>
> Cheers,
>
> Manos
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> For additional commands, e-mail: users-help@maven.apache.org
>
>
>
--
View this message in context: http://www.nabble.com/Setting-jar-order-in-maven.compile.classpath-tf4111876s177.html#a11811974
Sent from the Maven - Users mailing list archive at Nabble.com.
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
For additional commands, e-mail: users-help@maven.apache.org
Re: Setting jar order in maven.compile.classpath
Posted by Manos Batsis <ma...@geekologue.com>.
Come on guys let us not give too much attention to eachother :-)
I dont think Maven's behaviour regarding the order of JARs in the
classpath is random; that would be impossible.
My guess is the order is predictable and based on the dependencies
configuration and the algorithm that goes over it. Something like
1) Scan explicit deps
2) (Recursive?) Either
2.A) For each one add it's deps and move to the next depth level OR
2.B) Add each one, then process the next depth level of deps
3) Remove the overridden versions
This is pretty rough but you get the point. My bet is you will always
get the same classpath in a project whose POM does not change.
This of course may not provide an easy solution to the OPs prob, but the
code is OS after all so anyone is free to modify it as needed and post
patches in the JIRA or whatever :-)
Cheers,
Manos
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
For additional commands, e-mail: users-help@maven.apache.org
Re: Setting jar order in maven.compile.classpath
Posted by jaxzin <Br...@espn3.com>.
My bad. I didn't realize that a predictable classpath order vs. random
classpath order would shake the Maven project to the core of its very being
and betray the very objectives it has set out to achieve.
But on a more serious note, I've been using Maven for years and don't plan
to stop anytime soon. I'm in the process of moving ESPN to using Maven and
I'm encountering issues like these which I'll need to work through. Answers
like yours are condescending and unhelpful for people looking for help
instead of ridicule. Wayne, ya gotta lighten up a little, please?
Wayne Fay wrote:
>
> I can only refer you to the "What Is Maven" page [1]:
> Maven does encourage best practices, but we realise that some projects
> may not fit with these ideals for historical reasons. While Maven is
> designed to be flexible, to an extent, in these situations and to the
> needs of different projects, it can not cater to every situation
> without making compromises to the integrity of its objectives.
>
> If you decide to use Maven, and have an unusual build structure that
> you cannot reorganise, you may have to forgo some features or the use
> of Maven altogether.
>
>
> Good news -- no one (on this list, at least) is forcing you to use
> Maven! And its open source, so if you need this feature, you can go in
> and add it yourself.
>
> [1] http://maven.apache.org/what-is-maven.html
>
> Wayne
>
> On 7/25/07, jaxzin <Br...@espn3.com> wrote:
>>
>> That's such a cop-out. I've got legacy jars that my project depends on
>> that
>> happen to have some overlap in the classes. What's so wrong with AT
>> LEAST
>> obeying the declared order of the dependencies in the POM instead of the
>> random order that currently exists?
>>
>>
>> Wayne Fay wrote:
>> >
>> > You can't. "Set the order of jars" means you're duplicating code,
>> > which is generally a bad idea. Eliminate the duplication (make one
>> > depend on the other).
>> >
>> > Wayne
>> >
>> > On 7/19/07, Roger Huang (rchuang) <rc...@cisco.com> wrote:
>> >> How can I specify the order of jars in "maven.compile.classpath"? I
>> >> have two jars generated as part of my build that I need to explicitly
>> >> set the order of in maven.compile.classpath.
>> >> thanks,
>> >> Roger
>> >>
>> >>
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
>> > For additional commands, e-mail: users-help@maven.apache.org
>> >
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Setting-jar-order-in-maven.compile.classpath-tf4111876s177.html#a11800428
>> Sent from the Maven - Users mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
>> For additional commands, e-mail: users-help@maven.apache.org
>>
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> For additional commands, e-mail: users-help@maven.apache.org
>
>
>
--
View this message in context: http://www.nabble.com/Setting-jar-order-in-maven.compile.classpath-tf4111876s177.html#a11811553
Sent from the Maven - Users mailing list archive at Nabble.com.
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
For additional commands, e-mail: users-help@maven.apache.org
Re: Setting jar order in maven.compile.classpath
Posted by Wayne Fay <wa...@gmail.com>.
I can only refer you to the "What Is Maven" page [1]:
Maven does encourage best practices, but we realise that some projects
may not fit with these ideals for historical reasons. While Maven is
designed to be flexible, to an extent, in these situations and to the
needs of different projects, it can not cater to every situation
without making compromises to the integrity of its objectives.
If you decide to use Maven, and have an unusual build structure that
you cannot reorganise, you may have to forgo some features or the use
of Maven altogether.
Good news -- no one (on this list, at least) is forcing you to use
Maven! And its open source, so if you need this feature, you can go in
and add it yourself.
[1] http://maven.apache.org/what-is-maven.html
Wayne
On 7/25/07, jaxzin <Br...@espn3.com> wrote:
>
> That's such a cop-out. I've got legacy jars that my project depends on that
> happen to have some overlap in the classes. What's so wrong with AT LEAST
> obeying the declared order of the dependencies in the POM instead of the
> random order that currently exists?
>
>
> Wayne Fay wrote:
> >
> > You can't. "Set the order of jars" means you're duplicating code,
> > which is generally a bad idea. Eliminate the duplication (make one
> > depend on the other).
> >
> > Wayne
> >
> > On 7/19/07, Roger Huang (rchuang) <rc...@cisco.com> wrote:
> >> How can I specify the order of jars in "maven.compile.classpath"? I
> >> have two jars generated as part of my build that I need to explicitly
> >> set the order of in maven.compile.classpath.
> >> thanks,
> >> Roger
> >>
> >>
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> > For additional commands, e-mail: users-help@maven.apache.org
> >
> >
> >
>
> --
> View this message in context: http://www.nabble.com/Setting-jar-order-in-maven.compile.classpath-tf4111876s177.html#a11800428
> Sent from the Maven - Users mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> For additional commands, e-mail: users-help@maven.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
For additional commands, e-mail: users-help@maven.apache.org
Re: Setting jar order in maven.compile.classpath
Posted by jaxzin <Br...@espn3.com>.
That's such a cop-out. I've got legacy jars that my project depends on that
happen to have some overlap in the classes. What's so wrong with AT LEAST
obeying the declared order of the dependencies in the POM instead of the
random order that currently exists?
Wayne Fay wrote:
>
> You can't. "Set the order of jars" means you're duplicating code,
> which is generally a bad idea. Eliminate the duplication (make one
> depend on the other).
>
> Wayne
>
> On 7/19/07, Roger Huang (rchuang) <rc...@cisco.com> wrote:
>> How can I specify the order of jars in "maven.compile.classpath"? I
>> have two jars generated as part of my build that I need to explicitly
>> set the order of in maven.compile.classpath.
>> thanks,
>> Roger
>>
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> For additional commands, e-mail: users-help@maven.apache.org
>
>
>
--
View this message in context: http://www.nabble.com/Setting-jar-order-in-maven.compile.classpath-tf4111876s177.html#a11800428
Sent from the Maven - Users mailing list archive at Nabble.com.
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
For additional commands, e-mail: users-help@maven.apache.org
Re: Setting jar order in maven.compile.classpath
Posted by Wayne Fay <wa...@gmail.com>.
You can't. "Set the order of jars" means you're duplicating code,
which is generally a bad idea. Eliminate the duplication (make one
depend on the other).
Wayne
On 7/19/07, Roger Huang (rchuang) <rc...@cisco.com> wrote:
> How can I specify the order of jars in "maven.compile.classpath"? I
> have two jars generated as part of my build that I need to explicitly
> set the order of in maven.compile.classpath.
> thanks,
> Roger
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
For additional commands, e-mail: users-help@maven.apache.org