Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #39307

Re: maven and its downloads

Show key headers only | View raw

Joerg Meier <joergmmeier@arcor.de> wrote:
> On Wed, 26 Feb 2020 16:57:29 -0000 (UTC), Andreas Leitgeb wrote:
>> Eric Douglas <e.d.programmer@gmail.com> wrote:
>>> On Wednesday, February 26, 2020 at 4:16:26 AM UTC-5, Andreas Leitgeb wrote:
>>>> I've got a single maven project on a particular user at a machine.
>>>> After some development stages (with often changed dependencies),
>>>> I made a full clean+build (took only a few minutes), then used
>>>>    "find ~/.m2/repository -amin +60 -exec rm {} +"
>>>> (remove everything not used in the last 60 minutes)
>>>> On next build afterwards, it again downloaded a few packages.
>>>> Apparently, it downloads packages that it doesn't ever use.
>>>> Majority of them is in org.apache.maven group.
>>>> Given that the local repo of that user is used only for that
>>>> project, is there a way to prune it of no-longer necessary
>>>> stuff, while avoiding to prune stuff that will be re-downloaded?
>>> It should download everything in your pom file(s).
>>> Are you seeing projects downloaded which are not referenced for download anywhere?
>> Yes.  Well, not "anywhere in my pom-files".
>
> Try "mvn dependency:tree -Dverbose"

Thanks! I didn't know that.  It'll hopefully give me the reasons for
presence of some of the packages, although it doesn't seem to mention
(Fwiw, it says: "Verbose not supported since maven-dependency-plugin 3.0")

>>> Define "doesn't ever use".
>> As I wrote:  The OS doesn't record any attempt at reading those files
>> during the time I do a complete build.
> That doesn't mean they aren't "used" in your Maven context.
...
> You seem to have misunderstood Eric. Imagine this scenario: in your
> pom.xml, you reference a library. That library references Apache POI, which
> is a library that can write a spreadsheet. But your code never actually
> writes a spreadsheet, so the Apache POI library is never actually used (in
> the code you ran).

My logic may still be flawed, and I'd appreciate correction:

My project uses spring-boot-starter to build a standalone 
jar-file with everything included (as nested jar-files).

So, if my code had (e.g.) any chance to create a spreadsheet using a
3rd-party lib from the repo, then the actual code for creating the
spreadsheet would need to be included in the standalone jar, and
for that it would *need to be "accessed" during the build*.

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

maven and its downloads Andreas Leitgeb <avl@logic.at> - 2020-02-26 09:16 +0000
  Re: maven and its downloads Eric Douglas <e.d.programmer@gmail.com> - 2020-02-26 07:51 -0800
    Re: maven and its downloads Andreas Leitgeb <avl@logic.at> - 2020-02-26 16:57 +0000
      Re: maven and its downloads Joerg Meier <joergmmeier@arcor.de> - 2020-02-27 09:35 +0100
        Re: maven and its downloads Andreas Leitgeb <avl@logic.at> - 2020-02-27 11:30 +0000
          Re: maven and its downloads Andreas Leitgeb <avl@logic.at> - 2020-02-27 11:59 +0000
            Re: maven and its downloads Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2020-02-27 18:59 +0100
          Re: maven and its downloads Eric Douglas <e.d.programmer@gmail.com> - 2020-02-27 05:50 -0800

csiph-web