RequestParamMethodArgumentResolver(useDefaultResolution: Boolean)
useDefaultResolution - in default resolution mode a method argument that is a simple type, as defined in BeanUtils#isSimpleProperty, is treated as a request parameter even if it isn't annotated, the request parameter name is derived from the method parameter name.
RequestParamMethodArgumentResolver(@Nullable beanFactory: ConfigurableBeanFactory, useDefaultResolution: Boolean)
beanFactory - a bean factory used for resolving ${...} placeholder and #{...} SpEL expressions in default values, or null if default values are not expected to contain expressions
useDefaultResolution - in default resolution mode a method argument that is a simple type, as defined in BeanUtils#isSimpleProperty, is treated as a request parameter even if it isn't annotated, the request parameter name is derived from the method parameter name.