POM config exposes unneeded dependencies to client apps
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Key: DISPL-646
URL: http://jira.codehaus.org/browse/DISPL-646
Project: DisplayTag
Issue Type: Bug
Components: Build/distribution
Affects Versions: 1.2
Reporter: Jeff Jensen
DisplayTag transitive dependencies cause erroneous configuration on client
projects. Specifically, DisplayTag should depend on only slf4j-api in the
compile scope, resulting in exposing only that required dependency to client
apps, and the slf4j-log4j12 and jcl104-over-slf4j dependencies should be
removed (or changed to test scope if wanted for local testing).
slf4j-api would be a new direct dependency to DisplayTag. It currently is
transitively brought in through the slf4j-log4j12 direct dependency.
I noticed this because, after just adding DisplayTag to my web app, SLF4J gave
error messages on multiple SLF4J bindings on app startup - one binding is
correctly from my POM/app config (found in logback-classic) and the other is
erroneously exposed transitively from DisplayTag's dependency slf4j-log4j12.
See http://www.slf4j.org/codes.html#multiple_bindings for the SLF4J error.
The root cause is the DisplayTag POM exposing slf4j-log4j12 and
jcl104-over-slf4j dependencies. Client apps do not need those specifically,
e.g. slf4j-log4j12 is not needed with Logback.
This dependency configuration approach also forces client apps to have log4j on
the classpath transitively from slf4j-log4j12. We do not use Log4J.
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