Spaces cause the spring boot auto-configuration class to not be found

Recently, I am doing the development of multiplexing modules based on spring boot.
(version 1.5.10.RELEASE)
wrote a self-configuring module, the first class is fine.
Added one, but always reported FileNotFound error.
Compare the spelling, recompile, redistribute the package, all tried, but no solution.

Finally, I opened spring.factories in the spring boot code and found that there is no space between the class names.
Then, remove the spaces in my own modules... Okay.