User Create

[eric]

I want to create a user with the method : createUSer() in the class 
JahiaUserManagerDBProvider. Here is the code i wrote, it returns no errors but 
the user is not created .
/***************************************/
JahiaUser newUser;
Properties mProps = new Properties();
mProps.setProperty("lastname","ok");
mProps.setProperty("firstname","ok2");
newUser= JahiaUserManagerDBProvider.getInstance().createUser
("TEST_USER","azertyu","tyhyh",0,mProps);
/*****************************************/