spring 事务处理中，同一个类中:A方法（无事务）调B方法（有事务）,事务不生效问题

public class MyEntry implements IBaseService{
	public String A(String jsonStr) throws Exception{
		UserInfo user = null;
		UserDetail userDetail = null;
		this.getUserMsg(user,userDetail ,jsonStr);
		if(null!= user){
			this.B（user,userDetail）;
		}
		return "";
	}
	//此处需要事务
	private String B(UserInfo user, UserDetail detail) throws DBException{
		baseDao.saveObject(user);
		baseDao.saveObject(detail);
	}
}public class MyEntry implements IBaseService{