Warning during compilation

I got the following warning when compiling this software:

[WARNING] Can't extract module name from plexus-container-default-1.0-alpha-9-stable-1.jar: plexus.container.default: Invalid module name: 'default' is not a Java identifier
[WARNING] ************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
[WARNING] * Required filename-based automodules detected: [SparseBitSet-1.2.jar, commons-7.2.5.jar, kernel-7.2.5.jar, layout-7.2.5.jar, io-7.2.5.jar, serializer-2.7.2.jar, poi-4.1.2.jar, poi-ooxml-4.1.2.jar, poi-ooxml-schemas-4.1.2.jar, commons-math3-3.6.1.jar, jocl-2.0.5.jar, kdtree-1.0.3.jar, antlr-2.7.7.jar]. Please don't publish this project to a public artifact repository! *
[WARNING] ************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************

I'm not sure what it's complaining about, but if this warning can't be resolved in the code, it would be useful to note it in the README or MAINTAINERS file so it's clear that it's expected (I'm guessing it's to do with the way in which the API code fits into the broader GroIMP program?).