タイプ 'java.lang.String'のプロパティ値を必要な型に変換できませんでした。カラムはnullにできません。コンバータ

Question

hibernate（OneToMany、ManyToOne）+ spring mvcを使用してデータベースにレジスタを追加しようとしています。オブジェクトに文字列を変換するコンバータを用いたM ....これは私のコードである：

モデル

@Entity 
@Table(name="sl_players") 
public class Player implements Serializable{ 
private static final long serialVersionUID = 1L; 

@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
@Column(name="id_player") 
private int id; 

@Column(name="name_player") 
private String name 

@ManyToOne 
@JoinColumn(name="id_team") 
private Team team; 
-------------------------------------------------------- 
@Entity 
@Table(name="sl_teams") 
public class Team implements Serializable{ 

private static final long serialVersionUID = 1L; 

@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
@Column(name="id_team") 
private int id; 

@Column(name="name_team") 
private String name; 

@OneToMany(cascade=CascadeType.ALL) 
@JoinColumn(name="id_team") 
private List<Player> players = new ArrayList<Player>(); 

CONTROLLER

@Controller 
public class PlayerController { 

@Autowired 
private PlayerService playerService; 
@Autowired 
private TeamService teamService; 

@RequestMapping(value="/admin/players/save", method=RequestMethod.POST) 
public String addPlayer(@RequestParam("teamId") Integer teamId, @ModelAttribute("player") Player player, BindingResult result){ 
    System.out.print("Result: "+result.getAllErrors()); 
    if(0 == player.getId()) 
     this.playerService.save(player); 
    else 
     this.playerService.update(player,teamId); 
    return "redirect:/admin/players"; 
} 
@ModelAttribute("teamOptions") 
public List<Team> getTeam(){ 
    return new LinkedList<Team>(teamService.loadAll()); 
} 

コンバータ

@Component 
public class StringToTeam implements Converter<String, Team>{ 

@Autowired 
TeamService teamService; 

@Override 
public Team convert(String source) { 
    System.out.print("*** inside Converter ***"); 
    return teamService.get(Integer.parseInt(source)); 
} 

サーブレット・コンテキスト

<mvc:annotation-driven conversion-service="conversionService"/> 
<beans:bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> 
    <beans:property name="converters"> 
     <beans:list> 
      <beans:bean id="roleToUserProfile" class="com.project.converter.StringToTeam"/> 
     </beans:list> 
    </beans:property> 
</beans:bean> 

これが出力されます。

Result: [Field error in object 'player' on field 'team': rejected value [2]; codes [typeMismatch.player.team,typeMismatch.team,typeMismatch.com.project.model.Team,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [player.team,team]; arguments []; default message [team]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'com.project.model.Team' for property 'team'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [com.project.soccerleagueapp.model.Team] for property 'team': no matching editors or conversion strategy found]] 
ERROR: org.hibernate.engine.jdbc.spi.SqlExceptionHelper - Column 'id_team' cannot be null 

誰もが、私を助けてくださいことができますか？

Answer 1

この例のように試してみてください。

Myconverter

@Component("applicationToFluxConverter") 
public class ApplicationToFluxConverter implements Converter<String, PIL_P_APPLCTN> { 

    static final Logger logger = LoggerFactory.getLogger(ApplicationToFluxConverter.class); 

    @Autowired 
    @Qualifier("pIL_P_APPLCTN_SERVICE") 
    IService<PIL_P_APPLCTN> appService; 

    /** 
    * 
    * 
    * @see org.springframework.core.convert.converter.Converter#convert(java.lang.Object) 
    */ 
    public PIL_P_APPLCTN convert(String element) { 
     Integer id = Integer.parseInt((String) element); 
     PIL_P_APPLCTN app = appService.findById(id); 
     logger.info("Application : {}", app); 
     return app; 
    } 
} 

のAppConfig：

@Configuration 
@EnableWebMvc 
@ComponentScan(basePackages = "com.fussa.fyby") 
public class AppConfig extends WebMvcConfigurerAdapter { 


    @Autowired 
    ApplicationToFluxConverter applicationToFluxConverter; 

    @Bean 
    public ViewResolver viewResolver() { 
     InternalResourceViewResolver viewResolver = new InternalResourceViewResolver(); 
     viewResolver.setViewClass(JstlView.class); 
     viewResolver.setPrefix("/WEB-INF/views/"); 
     viewResolver.setSuffix(".jsp"); 
     return viewResolver; 
    } 

    @Override 
    public void addFormatters(FormatterRegistry registry) { 
     registry.addConverter(applicationToFluxConverter); 
    } 
//.... 
    }