In this project unmappedTargetPolicy is IGNORE in POM.xml file.
<compilerArgs>
<compilerArg>
-Amapstruct.unmappedTargetPolicy=IGNORE
</compilerArg>
</compilerArgs>StudentMapperUnmappedTargetPolicyIGNORE mapper interface using default unmappedTargetPolicy WARN defined in pom.xml
StudentMapperUnmappedTargetPolicyWARN mapper interface overridden unmappedTargetPolicy IGNORE using @Mapper annotation to WARN level.
@Mapper(unmappedTargetPolicy = ReportingPolicy.WARN)
Here you can see both mapper interfaces are exactly same, but for StudentMapperUnmappedTargetPolicyWARN it is showing below warning as we have override unmappedTargetPolicy from IGNORE to WARN.
Unmapped target property: "mobileNumber".