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我是spring boot的新手，一段时间以来我遇到了这个错误，不幸的是无法修复它。从那时起我就在谷歌上搜索，但仍然没有发现我做错了什么。在我的代码下面找到：

实体

@Entity
@Table(name="compagnie")
public class Compagnie implements Serializable {

    private static final long serialVersionUID = 1L;
    
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id_compagnie")
    private int idCompagnie;
    
    @Column(name="nom_compagnie")
    private String nomCompagnie;
    
    @Column(name="nom_court_compagnie")
    private String nomCourtCompagnie;
    
    @Column(name="logo_compagnie")
    private String logoCompagnie;

    public int getIdCompagnie() {
        return idCompagnie;
    }

    public void setIdCompagnie(int idCompagnie) {
        this.idCompagnie = idCompagnie;
    }

    public String getNomCompagnie() {
        return nomCompagnie;
    }

    public void setNomCompagnie(String nomCompagnie) {
        this.nomCompagnie = nomCompagnie;
    }

    public String getNomCourtCompagnie() {
        return nomCourtCompagnie;
    }

    public void setNomCourtCompagnie(String nomCourtCompagnie) {
        this.nomCourtCompagnie = nomCourtCompagnie;
    }

    public String getLogoCompagnie() {
        return logoCompagnie;
    }

    public void setLogoCompagnie(String logoCompagnie) {
        this.logoCompagnie = logoCompagnie;
    }
}

道

@Component
public interface CompagnieDao extends JpaRepository<Compagnie, Integer> {
    @Query("select c from Compagnie c where idCompagnie != :idCompagnie")
    List<Compagnie> getAllCompagnieNonAssurAstuce(@Param("idCompagnie") int idCompagnie);
    @Query("select c from Compagnie c where nomCompagnie = :nomCompagnie")
    Compagnie getCompagnieByNom(@Param("nomCompagnie") String nomCompagnie);
}

主要的

@SpringBootApplication
public class Application implements CommandLineRunner {
    
    @Autowired
    private CompagnieDao compagnieDao;

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        System.out.println("tic toc");
        List<Compagnie> compagnies = compagnieDao.findAll();        
        compagnies.forEach(compagnie -> System.out.println(compagnie.getNomCompagnie()));
    }

}

错误

启动 ApplicationContext 时出错。要显示条件报告，请在启用“调试”的情况下重新运行您的应用程序。2020-12-30 11:54:42.817 错误 10136 --- [restartedMain] osbdLoggingFailureAnalysisReporter：

应用程序无法启动

说明：com.assurastuce.Application 中的字段 compagnieDao 需要找不到类型为“com.dao.CompagnieDao”的 bean。注入点有以下注解： - @org.springframework.beans.factory.annotation.Autowired(required=true) 行动：考虑在你的配置中定义一个 'com.dao.CompagnieDao' 类型的 bean。

谢谢您的帮助

我将 spring 版本从2.4.1更改为2.3.4.RELEASE，现在出现此错误

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:798) [spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:779) [spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:322) [spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at com.assurastuce.Application.main(Application.java:20) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_271]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_271]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_271]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_271]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.3.4.RELEASE.jar:2.3.4.RELEASE]
Caused by: java.lang.NullPointerException: null
    at com.assurastuce.Application.run(Application.java:26) [classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:795) [spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    ... 10 common frames omitted

2020-12-31 08:26:45.401  INFO 11520 --- [  restartedMain] o.e.jetty.server.AbstractConnector       : Stopped ServerConnector@19b4bd36{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
2020-12-31 08:26:45.401  INFO 11520 --- [  restartedMain] org.eclipse.jetty.server.session         : node0 Stopped scavenging
2020-12-31 08:26:45.405  INFO 11520 --- [  restartedMain] o.e.j.s.h.ContextHandler.application     : Destroying Spring FrameworkServlet 'dispatcherServlet'
2020-12-31 08:26:45.407  INFO 11520 --- [  restartedMain] o.e.jetty.server.handler.ContextHandler  : Stopped o.s.b.w.e.j.JettyEmbeddedWebAppContext@4bfa6d74{application,/,[file:///C:/Users/LAKATAN%20Adebayo%20G.%20W/AppData/Local/Temp/jetty-docbase.8010039629830210588.8080/],UNAVAILABLE}
2020-12-31 08:26:45.430  INFO 11520 --- [  restartedMain] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2020-12-31 08:26:45.434  INFO 11520 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2020-12-31 08:26:45.438  INFO 11520 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2020-12-31 08:26:45.465  INFO 11520 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
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1 回答 1

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可能文件夹结构不正确。您能否添加这行代码并检查这是否适合您。

@SpringBootApplication
@ComponentScan(value = "com.dao.CompagnieDao")
public class Application implements CommandLineRunner {

另外，我认为如果将 @Component 替换为 @Repository 注释会更正确。

@Repository
public interface CompagnieDao extends JpaRepository<Compagnie, Integer> {
于 2020-12-30T16:00:06.967 回答