GitHub user jhaber opened a pull request:

    https://github.com/apache/maven-shared/pull/21

    [MSHARED-632] Expose which dependency classes are used and where

    We use the maven-dependency-plugin to analyze dependencies and fail our 
build if there are any used undeclared or unused declared dependencies. In the 
case of used undeclared dependencies, it is often helpful to know which classes 
are being used and where they are being used. We've found a few workarounds to 
make this a little easier, but the plugin has access to this information so 
what we really want is for the plugin to just print this info along with each 
used undeclared dependency. We've made this change in our fork and our 
developers are very happy with it, so I'd like to contribute it back 
([here](https://gist.github.com/jhaber/d8204829fe61569e0034250df74300fb) is an 
example of the output before and after the change).
    
    If you agree this is a useful feature, this PR implements the first step 
which is to update the maven-dependency-analyzer to return this information so 
that the maven-dependency-plugin can use it.
    
    I introduced a new interface, `DependencyAnalyzerWithUsages`, to avoid 
breaking changes to the `DependencyAnalyzer` interface. I confirmed with the 
japi-compliance-checker that source and binary compatibility has been 
maintained:
    
    ```
    ➜  ~ perl japi-compliance-checker.pl -lib maven-dependency-analyzer 
-jdk-path $JAVA7_HOME -old ~/Downloads/maven-dependency-analyzer-1.6.jar -new 
~/src/maven-shared-pr/maven-dependency-analyzer/target/maven-dependency-analyzer-1.7-SNAPSHOT.jar
    using Java 1.7.0_75
    WARNING: set 1st version number to 1.6 (use -v1 option to change it)
    WARNING: set 2nd version number to 1.7-SNAPSHOT (use -v2 option to change 
it)
    reading classes 1.6 ...
    reading classes 1.7-SNAPSHOT ...
    comparing classes ...
    creating compatibility report ...
    result: COMPATIBLE
    total "Binary" compatibility problems: 0, warnings: 0
    total "Source" compatibility problems: 0, warnings: 0
    see detailed report:
      
compat_reports/maven-dependency-analyzer/1.6_to_1.7-SNAPSHOT/compat_report.html
    ``` 
    
    I'd love to hear any thoughts or feedback you have, thanks!

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/jhaber/maven-shared trunk

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/maven-shared/pull/21.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #21
    
----
commit 578043a6dbf3927491aa01b00497b194ec471ebd
Author: Jonathan Haber <[email protected]>
Date:   2017-04-21T03:41:32Z

    Expose which dependency classes are used and where

----


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