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使用 Neo4j ogm 时，找不到类 Person 所需的标识符属性？

分类：编程问答

如何解决使用 Neo4j ogm 时，找不到类 Person 所需的标识符属性？

我是 Neo4j 的新手。从我目前阅读的内容来看，我明白在我的应用程序外部使用默认的 <id> 参数通常是不好的做法。因此，我希望能够指定我自己的 personId 参数与 <id> 分开。为此，我想使用 neo4j-ogm，但是我收到此异常：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'personController' defined in file [/Users/freid/www/project/address-book/build/classes/java/main/com/addressbook/controller/PersonController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personRepository' defined in com.addressbook.repositories.PersonRepository defined in @EnableNeo4jRepositories declared on SetupBeans: Invocation of init method Failed; nested exception is java.lang.IllegalStateException: required identifier property not found for class com.addressbook.model.Person!
        at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:229) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.autowireConstructor(AbstractAutowireCapablebeanfactory.java:1354) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBeanInstance(AbstractAutowireCapablebeanfactory.java:1204) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:564) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:335) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:333) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:208) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.DefaultListablebeanfactory.preInstantiateSingletons(DefaultListablebeanfactory.java:944) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.context.support.AbstractApplicationContext.finishbeanfactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.5.jar:5.3.5]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.5.jar:5.3.5]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.4.jar:2.4.4]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:769) ~[spring-boot-2.4.4.jar:2.4.4]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) ~[spring-boot-2.4.4.jar:2.4.4]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.4.jar:2.4.4]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.4.jar:2.4.4]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1313) ~[spring-boot-2.4.4.jar:2.4.4]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302) ~[spring-boot-2.4.4.jar:2.4.4]
        at com.addressbook.Application.main(Application.java:17) ~[main/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personRepository' defined in com.addressbook.repositories.PersonRepository defined in @EnableNeo4jRepositories declared on SetupBeans: Invocation of init method Failed; nested exception is java.lang.IllegalStateException: required identifier property not found for class com.addressbook.model.Person!
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.initializeBean(AbstractAutowireCapablebeanfactory.java:1786) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:602) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:335) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:333) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:208) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.DefaultListablebeanfactory.doResolveDependency(DefaultListablebeanfactory.java:1380) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.DefaultListablebeanfactory.resolveDependency(DefaultListablebeanfactory.java:1300) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.5.jar:5.3.5]
        ... 20 common frames omitted
Caused by: java.lang.IllegalStateException: required identifier property not found for class com.addressbook.model.Person!
        at org.springframework.data.mapping.PersistentEntity.getrequiredIdProperty(PersistentEntity.java:105) ~[spring-data-commons-2.4.6.jar:2.4.6]
        at org.springframework.data.repository.core.support.PersistentEntityinformation.getIdType(PersistentEntityinformation.java:74) ~[spring-data-commons-2.4.6.jar:2.4.6]
        at org.springframework.data.neo4j.repository.support.Neo4jRepositoryFactory.getTargetRepository(Neo4jRepositoryFactory.java:67) ~[spring-data-neo4j-6.0.6.jar:6.0.6]
        at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:281) ~[spring-data-commons-2.4.6.jar:2.4.6]
        at org.springframework.data.repository.core.support.RepositoryfactorybeanSupport.lambda$afterPropertiesSet$5(RepositoryfactorybeanSupport.java:323) ~[spring-data-commons-2.4.6.jar:2.4.6]
        at org.springframework.data.util.Lazy.getNullable(Lazy.java:230) ~[spring-data-commons-2.4.6.jar:2.4.6]
        at org.springframework.data.util.Lazy.get(Lazy.java:114) ~[spring-data-commons-2.4.6.jar:2.4.6]
        at org.springframework.data.repository.core.support.RepositoryfactorybeanSupport.afterPropertiesSet(RepositoryfactorybeanSupport.java:329) ~[spring-data-commons-2.4.6.jar:2.4.6]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.invokeInitMethods(AbstractAutowireCapablebeanfactory.java:1845) ~[spring-beans-5.3.5.jar:5.3.5]
        at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.initializeBean(AbstractAutowireCapablebeanfactory.java:1782) ~[spring-beans-5.3.5.jar:5.3.5]
        ... 31 common frames omitted`

这是我的 Person 节点：

package com.addressbook.model;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotEmpty;

import lombok.Builder;
import lombok.Getter;
import lombok.Setter;
import org.neo4j.ogm.annotation.*;

import java.util.Set;

@NodeEntity
@Getter
@Setter
public class Person {
    @Id
    @GeneratedValue
    Long personId;

    @Builder
    public Person(Long personId,String firstName,String lastName,Integer age) {
        this.personId = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = age;
    }

    @NotEmpty(message = "Please provide a first name")
    String firstName;

    @NotEmpty(message = "Please provide a last name")
    String lastName;

    @Min(value = 18,message = "Age should not be less than 18")
    @Max(value = 150,message = "Age should not be greater than 150")
    Integer age;

    @Relationship(type = "SPOUSE",direction=Relationship.OUTGOING)
    public Set<Person> spouse;

    @Relationship(type = "SIBLING",direction=Relationship.OUTGOING)
    public Set<Person> sibling;

    @Relationship(type = "FAMILY",direction=Relationship.OUTGOING)
    public Set<Person> family;
}

这是我的 Person 存储库：

package com.addressbook.repositories;

import com.addressbook.model.Person;
import org.springframework.data.neo4j.repository.Neo4jRepository;

public interface PersonRepository extends Neo4jRepository<Person,Long> {}

而且，这是我的 Person 控制器：

package com.addressbook.controller;

import com.addressbook.exception.NotFoundException;
import com.addressbook.model.Person;
import com.addressbook.repositories.PersonRepository;
import com.addressbook.model.View;
import com.fasterxml.jackson.annotation.JsonView;
import io.swagger.annotations.Api;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import lombok.extern.log4j.Log4j2;
import javax.validation.*;

@Log4j2
@RestController
@RequestMapping("/api/v1")
@Api(tags = { "Person" })
public class PersonController {

    private final PersonRepository personRepository;

    @Autowired
    public PersonController(PersonRepository personRepository) {
        this.personRepository = personRepository;
    }

    @GetMapping("person/{personId}")
    @ResponseStatus(HttpStatus.OK)
    public ResponseEntity<Person> getPerson(@PathVariable("personId") Long id) throws NotFoundException {
        Person person = this.personRepository.findById(id).orElseThrow(() -> new NotFoundException("Person not found!"));

        return new ResponseEntity(person,HttpStatus.OK);
    }

}

这个异常似乎只在我使用 org.neo4j.ogm.annotation.Id 注释时发生。如果我使用 org.springframework.data.neo4j.core.schema.Id 注释，那么我可以创建和检索实体。但是，它似乎只使用默认的 <id> 创建实体，这不是我想要的。

我的理解可能是错误的，org.neo4j.ogm.annotation.Id 应该允许您添加自己的 id 与 <id> 分开，甚至允许您将其与 org.neo4j.ogm.id.UuidStrategy 结合使用 uuid {1}} 用于实体。这是正确的吗？

我不确定为什么异常会显示 required identifier property not found for class com.addressbook.model.Person!，因为我认为 org.neo4j.ogm.annotation.Id 注释会满足这一点。

任何帮助将不胜感激。

解决方法

您可能将较早的 neo4j-ogm 与最新的 Spring Data Neo4j

检查您的依赖项并确保您的注释来自正确的包（例如，org.springframework.data.neo4j.*）

如果您按照上面链接中的说明进行操作，您应该能够解决您的错误。

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