MissingServletRequestParameterException: Required String parameter 'param' is not present]
@ required = false, object type을 주지 않았을떄
object = null
@ required = false, primitive type을 주지 않았을떄
java.lang.IllegalStateException: Optional int parameter 'minStartTime' is present but cannot be translated into a null value due to being declared as a primitive type.
@ required = true , param을 주지 않았을때
@ required = false, object type을 주지 않았을떄
@ required = false, primitive type을 주지 않았을떄