Hi Jan,

are you using any of the shade transformers? We had similar problems in the 
PLC4X project, but configuring:


Helped quite a bit.

Have a look here:

Hope this helps.


Am 03.12.19, 10:43 schrieb "Jan Lukavský" <je...@seznam.cz>:

    Hi Matt,
    thanks for reaction. Is there a workaround around this? I think that the 
    PR I propose is "safe" and might be considered as a hotfix before a 
    proper solution is found? I don't know how is the release cycle of maven 
    plugins defined, but if there is an upcoming release soon, this might help?
    On 12/2/19 8:06 PM, Matt Foley wrote:
    > Hi Jan,
    > See also https://github.com/apache/maven-shade-plugin/pull/14 and 
    > I stalled on it because it appears to be a lot of work to create unit 
tests for maven plugins — and there weren’t examples to follow in the shade 
    > That said, I’m not sure what I did is the right way to fix it.  I’ve seen 
emails go by that indicate the possibility of duplication in attachment lists 
affects several plugins, and the best way would be a global change in the 
underlying methods for “attachArtifact” that checks to see if the requested 
item is already there and not duplicate it if so (without error).
    > Regards,
    > —Matt
    > On Nov 28, 2019, at 7:03 AM, Jan Lukavský <je...@seznam.cz> wrote:
    > Hi Maven :),
    > I encountered an exception in my build and I'm not sure if there is 
something wrong with how I structure tasks in my pom.xml, or there is a room 
for improvement of the shade plugin.
    > The symptoms are as follows:
    >   - mvn install works just fine
    >   - mvn deploy fails on 'duplicate error: META-INF/service/....' while 
shading test jar
    > The reason for that seems that it includes the regular (not test-jar), 
and that one already includes the shaded service. When shading with the other 
dependencies, this fails. I managed to fix this locally with [1], but I'm not 
sure if this is a proper fix. I didn't fill any JIRA yet, because I wanted to 
check with you what the best solution should look like. I also don't know when 
or how this broke, but at least somewhat in early 2019 this worked. I probably 
changed the shade plugin to latest version later this year.
    > Thanks for comments and suggestions!
    > Jan
    > [1] https://github.com/apache/maven-shade-plugin/pull/32
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