In some situations the source code files, displaying the warnings are empty.
In some setups the default encoding was not set. This caused an exception in the class HealthAwareRecorder.java in
private void print(final FileOutputStream outputStream, final String message,
final Object... arguments) throws IOException
The default encoding was an empty string and therefore the write function threw the IOException "Unknown Encoding".
This resulted in jumping out of the logging function to print the statement, that the path to the source file is wrong.
Fixed/Workaround by setting the Default Encoding in the configuration setting to "UTF-8"