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https://issues.apache.org/jira/browse/ODFTOOLKIT-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16148781#comment-16148781
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Olivier Cailloux edited comment on ODFTOOLKIT-464 at 8/31/17 10:11 AM:
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An official explanation about SLF4J bindings is 
[here|https://www.slf4j.org/codes.html#multiple_bindings]: “Embedded components 
such as libraries or frameworks should not declare a dependency on any SLF4J 
binding but only depend on slf4j-api. When a library declares a compile-time 
dependency on a SLF4J binding, it imposes that binding on the end-user, thus 
negating SLF4J's purpose. When you come across an embedded component declaring 
a compile-time dependency on any SLF4J binding, please take the time to contact 
the authors of said component/library and kindly ask them to mend their ways.”


was (Author: oliviercailloux):
An official explanation about SLF4J bindings is 
[here|https://www.slf4j.org/codes.html#StaticLoggerBinder] and 
[here|https://www.slf4j.org/codes.html#multiple_bindings].

> Pom does not follow best practices: missing optional keyword
> ------------------------------------------------------------
>
>                 Key: ODFTOOLKIT-464
>                 URL: https://issues.apache.org/jira/browse/ODFTOOLKIT-464
>             Project: ODF Toolkit
>          Issue Type: Bug
>          Components: simple api
>            Reporter: Olivier Cailloux
>            Priority: Minor
>
> When depending on Apache ODFToolkit simple-odf in my application 
> (org.apache.odftoolkit:simple-odf:0.8.2-incubating), I observe that 
> com.sun:tools is transitively imposed on my project as a dependency (coming 
> from taglets, see its 
> [POM|https://repo1.maven.org/maven2/org/apache/odftoolkit/taglets/0.8.11-incubating/taglets-0.8.11-incubating.pom]).
>  Similarly, org.slf4j:slf4j-log4j12 is passed to my project as a dependency.
> I suspect these dependencies are actually not required for projects depending 
> on simple-odf.
> It is possible and simple to ease the life of users of simple-odf by adding 
> <optional> in the relevant pom files. This would respect Maven best 
> practices. (See for example 
> [SO|https://stackoverflow.com/questions/32231814/how-can-i-remove-logback-from-a-librarys-dependency-while-keeping-slf4j].)
> Workaround: add exclusion rules for these artifacts (see this example 
> [POM|https://github.com/oliviercailloux/Test-ODFToolkit-ODS/blob/master/pom.xml]).
> (I tried to discuss it 
> [here|https://lists.apache.org/thread.html/6fa4257e67ede90bac58f5518e1be41e7561a451149cbc9eecdbbf1e@%3Codf-users.incubator.apache.org%3E]
>  but received no answer.)



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