elharo opened a new issue, #65:
URL: https://github.com/apache/maven-mapping/issues/65

   ## Description
   
   When an artifact has a null classifier and the mapping expression uses 
`@{classifier}@` (e.g. `DEFAULT_FILE_NAME_MAPPING_CLASSIFIER`), the output 
filename contains a trailing dash:
   
   ```
   maven-test-lib-1.0-.jar
                ^ trailing dash
   ```
   
   This happens because `DashClassifierValueSource` sets `classifier` to `""` 
when the classifier is null (`DashClassifierValueSource.java:69`).
   
   The `@{dashClassifier?}@` variant handles this correctly (produces empty 
string with no dash), making the non-`?` variant inconsistent.
   
   ## Expected behavior
   
   Users of `DEFAULT_FILE_NAME_MAPPING_CLASSIFIER` likely expect that a null 
classifier either omits the classifier segment entirely, or at least does not 
leave a dangling dash.
   
   ## Relevant code
   
   `DashClassifierValueSource.java:59-72`


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