A DESCRIPTION OF THE PROBLEM :
Service provider mechanism is inconsistent when used with module-info.java and META-INF/resources and docs of ServiceLoader does not explain why.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create Service and Provider for this service in a single project.
When modules are used and provider is declared in module-info.java everything works fine.
When provider is declared in META-INF/services the provider is not discovered.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Consistent behaviour in both cases and explanation in ServiceLoader documentation.
ACTUAL -
Different behaviour in both cases.

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See attached zip file.
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FREQUENCY : always