java.lang.Error：未解决的编译问题：方法EmployeeDAO类型的getEmployee（String）未定义

Question

我正在使用Eclipse IDE运行我的Maven项目，该项目使用REST执行CRUD。该应用程序在Tomcat服务器上运行，但是当我转到http://localhost:8080/RESTfulCRUD/rest/employees/E01时，出现上述错误。它说这些方法实际上是未定义的。这些类如下：

  

EmployeeService

@Path("employees")
public class EmployeeService {

    // URI:
    // /contextPath/servletPath/employees
    @GET
    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
    public List<Employee> getEmployees_JSON() {
        List<Employee> listOfCountries = EmployeeDAO.getAllEmployees();
        return listOfCountries;
    }

    // URI:
    // /contextPath/servletPath/employees/{empNo}
    @GET
    @Path("/{empNo}")
    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
    public Employee getEmployee(@PathParam("empNo") String empNo) {
        return EmployeeDAO.getEmployee(empNo);
    }

    // URI:
    // /contextPath/servletPath/employees
    @POST
    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
    public Employee addEmployee(Employee emp) {
        return EmployeeDAO.addEmployee(emp);
    }

    // URI:
    // /contextPath/servletPath/employees
    @PUT
    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
    public Employee updateEmployee(Employee emp) {
        return EmployeeDAO.updateEmployee(emp);
    }

    @DELETE
    @Path("/{empNo}")
    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
    public void deleteEmployee(@PathParam("empNo") String empNo) {
        EmployeeDAO.deleteEmployee(empNo);
    }

}

  

EmployeeDAO

import org.o7planning.RESTfulCRUD.model.Employee;

public class EmployeeDAO {

    private static final Map<String, Employee> empMap = new HashMap<String, Employee>();

    static {
        initEmps();
    }

    private static void initEmps() {
        Employee emp1 = new Employee("E01", "Smith", "Clerk");
        Employee emp2 = new Employee("E02", "Allen", "Salesman");
        Employee emp3 = new Employee("E03", "Jones", "Manager");

        empMap.put(emp1.getEmpNo(), emp1);
        empMap.put(emp2.getEmpNo(), emp2);
        empMap.put(emp3.getEmpNo(), emp3);
    }

    public static Employee getEmployee(String empNo) {
        return empMap.get(empNo);
    }

    public static Employee addEmployee(Employee emp) {
        empMap.put(emp.getEmpNo(), emp);
        return emp;
    }

    public static Employee updateEmployee(Employee emp) {
        empMap.put(emp.getEmpNo(), emp);
        return emp;
    }

    public static void deleteEmployee(String empNo) {
        empMap.remove(empNo);
    }

    public static List<Employee> getAllEmployees() {
        Collection<Employee> c = empMap.values();
        List<Employee> list = new ArrayList<Employee>();
        list.addAll(c);
        return list;
    }

    List<Employee> list;


}

再有一个Employee类，但是没有问题。关于这个问题有什么想法吗？