是什么原因导致此Java“找不到符号"?错误? [英] What is causing this Java "Cannot find symbol" error?

问题描述

我正在修改继承的代码，并不断收到奇怪的找不到符号"错误，这使我无法自拔.

I'm modifying inherited code and keep getting a weird "cannot find symbol" error which is throwing me off.

   //======= Error =========

Compiling 1 source file to /Users/Inprimus/Projects/Workspace/Soft/build/web/WEB-INF/classes
/Users/Inprimus/Projects/Workspace/Soft/WebContent/WEB-INF/classes/fr/service/CarPeer.java:49: cannot find symbol
symbol : method addCarToCompany(java.lang.Long,fr.model.company.Car)
location: class fr.dao.CompanyDAO
cmpDAO.addCarToCompany(idCompany,car);
^
1 error

同伴:

package fr.service;    
import fr.model.company.Car;
import fr.dao.CompanyDAO;
import fr.dao.CarDao;

public class CarPeer {
    private static CarDao carDAO= new CarDao();
    private static CompanyDAO cmpDAO = new CompanyDAO();

    public static void storeCar(Long idCompany, Car car) throws UserServiceException, Exception {
        try {
            cmpDAO.addCarToCompany(idCompany,car);
            System.out.println("Car stored : "+car.toString()+" in "+idCompany);
            carDAO.storeCar(car);
        } catch(DAOException ex) {
            throw new UserServiceException(ex.getMessage(), ex);
        }
    }
}

CompanyDao:

CompanyDao:

   package fr.dao;
    import fr.model.accounting.Cost;
    import fr.model.company.Car;

    public class CompanyDAO extends GenericDAO<Company> {

    private enum ChildType {
    COST{
    public void addChildToCompany(Company company, Object child) {
    company.addCost((Cost)child);
    }
    },
    CAR{
    public void addChildToCompany(Company company, Object child) {
    company.addCar((Car)child);
    }
    };
    public abstract void addChildToCompany(Company company, Object child);
    }
private void addChildToCompany(Long idCompany, Object child, ChildType type) throws NotFoundDAOException, AlreadyExistDAOException, Exception {
        try {
            // Begin unit of work
            Session session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();

            Company company = (Company) session.load(Company.class, idCompany);

            type.addChildToCompany(company, child);
            session.flush();

            // End unit of work
            session.getTransaction().commit();

        } catch (ObjectNotFoundException ex) {
            HibernateUtil.getSessionFactory().getCurrentSession().getTransaction().rollback();
            throw new NotFoundDAOException("Identified object " + idCompany
                    + " doesn't exist in database", ex);
        } catch (ConstraintViolationException ex) {
            HibernateUtil.getSessionFactory().getCurrentSession().getTransaction().rollback();
            throw new AlreadyExistDAOException("The new identity already exsits in database", ex);
        } catch (Exception ex) {
            ex.printStackTrace();
            HibernateUtil.getSessionFactory().getCurrentSession().getTransaction().rollback();
            throw new Exception(ex);
        }
    }
    public CompanyDAO() {
    super(Company.class);
    }
    public void addCarToCompany(Long idCompany, Car car) throws NotFoundDAOException, AlreadyExistDAOException, Exception {
    addChildToCompany(idCompany, car, ChildType.CAR);
    }
    }

我已经进行了三重检查，但到目前为止找不到任何错误的代码.我正在Netbeans 7.0.1中构建它.我应该提到在构建时遇到此错误，但是我可以运行Web应用程序而没有任何问题(尚未).但我担心这种情况可能会重新出现在后面.

I have triple checked but can't find anything wrong with the code thus far. I am building it in Netbeans 7.0.1.I should mention that I get this error when I build, but I can run the web app with no issues whatsoever (yet). But I am worried this may come back to bite in the behind.

我刚刚在文件树中注意到，在CompanyDAO类之上是类似命名的文件，其格式为:CompanyDAO $ ChildType#.class(#对应于一个数字)我猜它还没有将类重新编译为生成我添加的额外子类型.我该如何实现?

I just noticed in the file tree that above the CompanyDAO classes are similarly named files bearing the format: CompanyDAO$ChildType#.class (# corresponds to a number) I'm guessing it hasn't re-compiled the class to generate the extra child Type I added. How can I effect this?

推荐答案

在CarPeer之前，CompanyDao是否已在类路径上编译并可用?

Is CompanyDao being compiled and available on the classpath before CarPeer?

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