问题 object 无法转换为另一个 object

Question

我有方法，它按 class 团队中的国家/地区对数据库中的数据进行排序。 Hibernate 在 List<> 中返回我的数据。 TeamsDao 我的 hibernate Dao 方法。 团队是在 1 个依赖项中定义的。

我的错误日志：

There was an unexpected error (type=Internal Server Error, status=500).
class com.champions.league.model.Teams cannot be cast to class com.champions.league.model.Teams (com.champions.league.model.Teams is in unnamed module of loader 'app'; com.champions.league.model.Teams is in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @169e859a)
java.lang.ClassCastException: class com.champions.league.model.Teams cannot be cast to class com.champions.league.model.Teams (com.champions.league.model.Teams is in unnamed module of loader 'app'; com.champions.league.model.Teams is in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @169e859a)

我的联赛冠军联赛 class：

@Controller
@RequestMapping("/teams")
public class ChampLeagueController {

@GetMapping
public String showDesignForm(Model model){
   List<Teams> teamsList = TeamsDao.findAll();
    Teams.Countries[] countries = Teams.Countries.values();
    for(Teams.Countries country: countries){
        model.addAttribute(country.toString().toLowerCase(), filterByCountry(teamsList, country));
    }
    model.addAttribute("ChampionsLeague", new ChampionsLeague());
    return "ChampionsLeague";
}

public ArrayList<Teams> filterByCountry(List<Teams> teamsList, Teams.Countries country){
    ArrayList<Teams> sortedList = new ArrayList<>();
    for (Teams teams : teamsList) {
        if (teams.getCountries() == country)
            sortedList.add(teams);
    }
    return sortedList;
}

我的团队 class：

@Entity
@Table(name = "teams")
public class Teams {
@Id
private int id;
private String name;
@Enumerated(EnumType.STRING)
private Countries countries;
public enum Countries{
    SPAIN, ENGLAND, GERMANY, ITALY, FRANCE, NETHERLANDS
}
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public Countries getCountries() {
    return countries;
}
public void setCountries(Countries countries) {
    this.countries = countries;
}

}

Answer 1

我建议您手动删除已编译的类，然后重新编译所有源代码。 我想我也遇到过一两次这样的问题......可能是罕见的编译器错误。