I want to test javaaction to commit something,when I call this javaaction,it throw com.mendix.systemwideinterfaces.core.UserException: Object id: 281474976711659, validation errors: (member: Password, message: The password cannot be empty.)
That is expected behaviour. Open up the System Domain Model in Studio Pro and you’ll see the User entity has a green tick next to the Password attribute. This means there is a validation rule against that. Opening up the validation rules shows that this attribute can not be empty.