Internal error in the mapping processor: java.lang.NullPointerException at org.mapstruct.ap.internal.model.BeanMappingMethod$Builder.build(BeanMappingMethod.java:201) at org.mapstruct.ap.internal.processor.MapperCreationProcessor.getMappingMethods(MapperCreationProcessor.java:373) at org.mapstruct.ap.internal.processor.MapperCreationProcessor.getMapper(MapperCreationProcessor.java:149) at org.mapstruct.ap.internal.processor.MapperCreationProcessor.process(MapperCreationProcessor.java:120) at org.mapstruct.ap.internal.processor.MapperCreationProcessor.process(MapperCreationProcessor.java:74) at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:283) at org.mapstruct.ap.MappingProcessor.processMapperTypeElement(MappingProcessor.java:263) at org.mapstruct.ap.MappingProcessor.processMapperElements(MappingProcessor.java:221) at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:152)