A DESCRIPTION OF THE PROBLEM :
The `javac` compiler switches into JPMS-mode if the target directory contains a compile module descriptor `module-info.class`.

This makes the compilation result (in this case a failure) dependent not only on the CLI options and source directories, but also on the contents of the output directory.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Clone the project at:

https://github.com/copernik-eu/bug-reproducibility/tree/main/javac-module-info-bug

and run `make` twice.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I would expect each compilation step to always work in the same way, i.e. each time:

javac -cp lib/log4j-api.jar -d target src/example/Main.java

is called, it will look for imported classes on the classpath.
ACTUAL -

The second execution of:

javac -cp lib/log4j-api.jar -d target src/example/Main.java

will fail while trying to resolve the modules references in the trailing `target/module-info.class` file.

CUSTOMER SUBMITTED WORKAROUND :
A temporary workaround consists in deleting the `module-info.class` file before each compilation step.

FREQUENCY : always