On 09/04/2015 06:06 PM, Gilles wrote:
On Fri, 4 Sep 2015 11:03:08 -0500, Ole Ersoy wrote:
On 09/04/2015 10:26 AM, Gilles wrote:
On Fri, 4 Sep 2015 10:11:04 -0500, Ole Ersoy wrote:
You have left over files in `target` after switching between the
branches.  For example check out `math4`.  Build it.  Switch to the
`math3` branch.  Build it.  Now `target` will contain both classes
from the math3 branch and the math4 branch.

No it's not the problem.
They are _source_ files.
Ahh - OK - Not sure if this will help, but you can for example
exclude the math3 package files from compilation like this:


|<plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>2.0.2</version><configuration><source>1.6</source><target>1.6</target><includes><include>org/apace/commons/math4/*.java</include>
</includes> </configuration> </plugin> </plugins>|


That works fine!

Thus it's not that maven _has_ to compile everything under "src/main";
it can be told otherwise.
Perhaps there are nasty side effects to that selection (?).
If someone clones the master off of github in order to experiment and they are 
used to being able to compile everything under `src/main/java` then they may be 
in for a surprise.


Otherwise, I still don't understand why it cannot be included in the
POM file...

You could create two new branches that you have your own POM modifications in:

- math3-gilles
- math4-gilles

Cheers,
- Ole


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