Luke Usherwood created MNG-6660:
-----------------------------------

             Summary: duplicate classes error with source in the root directory
                 Key: MNG-6660
                 URL: https://issues.apache.org/jira/browse/MNG-6660
             Project: Maven
          Issue Type: Bug
    Affects Versions: 3.6.1
            Reporter: Luke Usherwood


Trying to follow the instructions from 
[here|[https://github.com/bytedeco/javacpp-presets/tree/master/hdf5#sample-usage]]
 which entails adding this little pom:

    {{<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.bytedeco.hdf5</groupId>
    <artifactId>H5tutrCmprss</artifactId>
    <version>1.5</version>
    <properties>
        <exec.mainClass>H5tutrCmprss</exec.mainClass>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>hdf5-platform</artifactId>
            <version>1.10.5-1.5</version>
        </dependency>
    </dependencies>
    <build>
        <sourceDirectory>.</sourceDirectory>
    </build>
    </project>}}

and a Java source file to the root directory. (There's code in the same link, 
but actually anything I think anything with a `main` function will do.)

It does not seem to work with:

    {{<sourceDirectory>.</sourceDirectory>}}

Yielding the strange error

Compilation failure
[ERROR] /D:/work/workspace/hdf5/H5tutrCmprss.java:[7,8] duplicate class: 
H5tutrCmprss

(Seen also in: MCOMPILER-235)

However if I move the source under a sub-directory `src` and update the pom 
accordingly, it works fine.  I assume that this pom worked "out of the box" 
once, so I wonder if this is a regression?



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