There may be some misunderstandings:
The question scope=provided or not affects the dependency for my own library "my-lib" in the pom.xml of my application "my-app".
- If I remove it, the "Failed to copy file for artifact" returns (= problem 1).
- If I keep it, the external libraries referenced by "my-lib" (like postgresql-40.0.0.jar) don't get copied into the WEB-INF/lib folder of "my-app" (problem 2).
So by changing scope=provided I can only choose between problem 1 and problem 2.
Now you said that problem 2 isn't a problem, because the external libraries are provided at runtime, e. g. by Tomcat.
Let's focus this point.
I am running my own Tomcat and when I deploy a WAR file, I don't want to care about the external libraries it needs.
Before Maven, there was no need for this, because the external libs were included in WEB-INF/lib.
Now - with Maven - I shall care about the libs a WAR file needs a second time?
I already have specified all the dependencies in the pom.xml of my-lib.
Why not include all the needed jar fiiles in WEB-INF/lib and have one WAR file that can be deployed as its own?
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