创建名称为'roleRepository'的Java Spring Boot时出错

编程问答 2022-11-06

问题描述

角色存储库 

package com.jawad.api.repository;

import javax.management.relation.Role;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface RoleRepository extends CrudRepository<Role,Integer>{

}

AppsController 

package com.jawad.api.controller;

import java.util.List;

import javax.management.relation.Role;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.jawad.api.repository.RoleRepository;

@RestController
public class AppsController {
    
    @Autowired
    private RoleRepository rolerepository;
    
    @GetMapping("/getAllRoles")
    public List<Role> getAllRoles() {
        return (List<Role>) rolerepository.findAll();
    }
    
    @GetMapping("/hi")
    public String hi(){
        return "hi";
    }
}

PrepaidWebAppApplication 

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class PrepaidWebAppApplication {

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

运行应用程序时出现错误，我找不到解决方法：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': factorybean threw exception on object creation; nested exception is java.lang.IllegalArgumentException: Not a managed type: class javax.management.relation.Role
        at org.springframework.beans.factory.support.factorybeanRegistrySupport.doGetobjectFromfactorybean(factorybeanRegistrySupport.java:176) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.beans.factory.support.factorybeanRegistrySupport.getobjectFromfactorybean(factorybeanRegistrySupport.java:101) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.beans.factory.support.Abstractbeanfactory.getobjectForBeanInstance(Abstractbeanfactory.java:1827) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.getobjectForBeanInstance(AbstractAutowireCapablebeanfactory.java:1265) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:334) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.beans.factory.support.DefaultListablebeanfactory.getBeansOfType(DefaultListablebeanfactory.java:624) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.beans.factory.support.DefaultListablebeanfactory.getBeansOfType(DefaultListablebeanfactory.java:612) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:51) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:36) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at com.jawad.api.PrepaidWebAppApplication.main(PrepaidWebAppApplication.java:12) [classes/:na]
    Caused by: java.lang.IllegalArgumentException: Not a managed type: class javax.management.relation.Role
        at org.hibernate.metamodel.internal.metamodelImpl.managedType(metamodelImpl.java:582) ~[hibernate-core-5.4.18.Final.jar:5.4.18.Final]
        at org.hibernate.metamodel.internal.metamodelImpl.managedType(metamodelImpl.java:85) ~[hibernate-core-5.4.18.Final.jar:5.4.18.Final]
        at org.springframework.data.jpa.repository.support.JpametamodelEntityinformation.<init>(JpametamodelEntityinformation.java:75) ~[spring-data-jpa-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.jpa.repository.support.JpaEntityinformationSupport.getEntityinformation(JpaEntityinformationSupport.java:66) ~[spring-data-jpa-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityinformation(JpaRepositoryFactory.java:229) ~[spring-data-jpa-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:179) ~[spring-data-jpa-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:162) ~[spring-data-jpa-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:72) ~[spring-data-jpa-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:309) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.repository.core.support.RepositoryfactorybeanSupport.lambda$afterPropertiesSet$5(RepositoryfactorybeanSupport.java:297) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.util.Lazy.getNullable(Lazy.java:212) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.repository.core.support.RepositoryfactorybeanSupport.getobject(RepositoryfactorybeanSupport.java:244) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.data.repository.core.support.RepositoryfactorybeanSupport.getobject(RepositoryfactorybeanSupport.java:57) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
        at org.springframework.beans.factory.support.factorybeanRegistrySupport.doGetobjectFromfactorybean(factorybeanRegistrySupport.java:169) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        ... 24 common frames omitted

当我将PrepaidWebAppApplication.java移到包含3个模型（用户，角色和机构）的模型文件夹中时，它可以工作，但是我的get请求将不再被识别。我收到错误消息：404 not found。

我该如何解决？

解决方法

您已经从Role和javax中的RoleRepository包中导入了AppsController实体。从您的项目中导入它，它应该对您有用。

import javax.management.relation.Role;

将上述导入更改为项目Role实体。

,

关于spring-boot-starter-data-jpa的一些基本概念：

  1. stereotype注释，例如：
    A. @Component 。
    B. @Controller
    C. @Service
    D. @存储库
    春天一定是具体班级。

  2. Spring Boot的最新版本已自动启用@EnableJpaRepositories，并具有spring-boot-starter-data-jpa的相关性。

  3. @EnableJpaRepository负责CrudRepository，JPARepository等接口实现的注册。在这里，我们不需要添加stereotype的{​​{1}}注释。

  4. 对于接口SpringFramework，CrudRepository是JPA的一部分，因此它引用的类在具体类上必须具有JPA注释，例如JPARepository，@Entity。 / p>

现在回到您的问题陈述中

对于@Table：

  1. import javax.management.relation.Role是一个具体的类，即不是抽象类-> 已接受
  2. import javax.management.relation.Role类没有JPA注释，因此我们不能直接与import javax.management.relation.Role，CrudRepository ---> 不接受
  3. JPARepository不应包含RoleRepository注释。

解决方案：

  1. 创建一个类似于stereotype的类，上面带有JPA注释。
  2. import javax.management.relation.Role，CrudRepository中使用的JPA实体中必须包含JPARepository字段，否则您将遇到新的异常。
,

还请交叉检查您的实体类，我错过了下面的 Id 注释，以及主键上生成的值注释，因为存储库上发生了 org.springframework.beans.factory.BeanCreationException。

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
beancreationexceptionjavajavaspring-boot