Spring Neo4j OGM NullPointerException在抽象超类中使用@Id@GeneratedValue时

我正试图保存一个域对象，该域对象从超类继承了用@id@GeneratedValue（strategy=UuidStrategy.class）注释的id，但当我尝试保存时，会得到一个NullPointerException，即使声明这是可能的（并且是推荐的）。（请注意，如果我将id移动到非抽象子类，则节点将被愉快地保存）

该代码使用Spring Boot 2.0.0.M7

编辑#2:如果我现在将抽象类具体化（通过删除abstract关键字），那么节点现在将填充到数据库中。但是，如果没有abstract关键字，超类的标签也会应用于节点（即节点具有标签Fan、BaseNodeEntity和BaseEntity）。这可能是（暂时的？）解决问题的方法，尽管我不知道将这些额外的标签应用到所有节点的影响。（有人知道吗？）

编辑#1我已将抽象类移动到与其他节点相同的包中，以便根据SessionFactory的设置（对于包“com.ideafan.server.neo4j.node”）对其进行正确扫描，但我现在收到一个不满意的Pendency错误，如下所示：

2018-02-04 17:33:01.498 ERROR 15908 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataPopulatorService': Unsatisfied dependency expressed through field 'fanRepository'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fanRepository': Unsatisfied dependency expressed through method 'setSession' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.data.neo4j.transaction.SharedSessionCreator#0': Cannot resolve reference to bean 'sessionFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [com/ideafan/server/PersistenceContext.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'sessionFactory' threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:758) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868) ~[spring-context-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:138) ~[spring-boot-2.0.0.M7.jar:2.0.0.M7]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:751) [spring-boot-2.0.0.M7.jar:2.0.0.M7]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:387) [spring-boot-2.0.0.M7.jar:2.0.0.M7]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.M7.jar:2.0.0.M7]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1245) [spring-boot-2.0.0.M7.jar:2.0.0.M7]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1233) [spring-boot-2.0.0.M7.jar:2.0.0.M7]
    at com.ideafan.server.IdeaFanServerApplication.main(IdeaFanServerApplication.java:14) [classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fanRepository': Unsatisfied dependency expressed through method 'setSession' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.data.neo4j.transaction.SharedSessionCreator#0': Cannot resolve reference to bean 'sessionFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [com/ideafan/server/PersistenceContext.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'sessionFactory' threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:667) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1135) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    ... 19 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.data.neo4j.transaction.SharedSessionCreator#0': Cannot resolve reference to bean 'sessionFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [com/ideafan/server/PersistenceContext.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'sessionFactory' threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:378) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:110) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:622) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:440) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1250) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1135) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:659) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    ... 32 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [com/ideafan/server/PersistenceContext.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'sessionFactory' threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:587) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1250) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:367) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    ... 47 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'sessionFactory' threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:579) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    ... 56 common frames omitted
Caused by: java.lang.NullPointerException: null
    at org.neo4j.ogm.autoindex.AutoIndex.<init>(AutoIndex.java:39) ~[neo4j-ogm-core-3.0.2.jar:na]
    at org.neo4j.ogm.autoindex.AutoIndexManager.initialiseIndexMetadata(AutoIndexManager.java:74) ~[neo4j-ogm-core-3.0.2.jar:na]
    at org.neo4j.ogm.autoindex.AutoIndexManager.<init>(AutoIndexManager.java:59) ~[neo4j-ogm-core-3.0.2.jar:na]
    at org.neo4j.ogm.session.SessionFactory.<init>(SessionFactory.java:83) ~[neo4j-ogm-core-3.0.2.jar:na]
    at com.ideafan.server.PersistenceContext.sessionFactory(PersistenceContext.java:27) ~[classes/:na]
    at com.ideafan.server.PersistenceContext$$EnhancerBySpringCGLIB$$a83ca23f.CGLIB$sessionFactory$2(<generated>) ~[classes/:na]
    at com.ideafan.server.PersistenceContext$$EnhancerBySpringCGLIB$$a83ca23f$$FastClassBySpringCGLIB$$8bf83868.invoke(<generated>) ~[classes/:na]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361) ~[spring-context-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at com.ideafan.server.PersistenceContext$$EnhancerBySpringCGLIB$$a83ca23f.sessionFactory(<generated>) ~[classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    ... 57 common frames omitted

BaseNodeEntity.java

package com.ideafan.server.neo4j.node;

import org.neo4j.ogm.annotation.NodeEntity;

import com.ideafan.server.neo4j.BaseNodeEntity;

@NodeEntity
public class Fan extends BaseNodeEntity {

    String firstName;

    public Fan() {}

    public Fan(String firstName) {
        super();
        this.firstName = firstName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

}

public abstract class BaseNodeEntity extends BaseEntity {

}

package com.ideafan.server.neo4j;

import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.id.UuidStrategy;

public abstract class BaseEntity {

    @Id @GeneratedValue(strategy = UuidStrategy.class)
    private String uuid;

}

@Repository
public interface FanRepository extends Neo4jRepository<Fan, String> {

    Fan findByFirstName(String firstName);

}

@SpringBootApplication
public class IdeaFanServerApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(IdeaFanServerApplication.class, args);

        DataPopulatorService dataPopulatorService = applicationContext.getBean(DataPopulatorService.class);

        dataPopulatorService.populateSampleData();
    }

}

@Service
@Transactional
public class DataPopulatorService {

    private Logger logger = LogManager.getLogger();

    @Autowired private FanRepository fanRepository;

    public void populateSampleData() {

        Fan fan = new Fan("Fan");
        fanRepository.save(fan);

    }

}

@Configuration
@ComponentScan({"com.ideafan.server.controller"})
public class AppConfig {

    @Bean
    public DataPopulatorService dataPopulatorService() {
        return new DataPopulatorService();
    }

}

@Configuration
@ComponentScan("com.ideafan.server.neo4j")
@EnableNeo4jRepositories(basePackages = "com.ideafan.server.neo4j.repository")
@EnableTransactionManagement
public class PersistenceContext {

    @Bean
    public SessionFactory sessionFactory() {
        // with domain entity base package(s)
        return new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");
    }

    @Bean
    public org.neo4j.ogm.config.Configuration configuration() {

        // Configuration reference: https://neo4j.com/docs/ogm-manual/current/reference/#reference:configuration
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()
                .uri("bolt://neo4j:password@localhost") // Note: neo4j is the username and password is the password.
                .build();
        return configuration;

    }

    @Bean
    public Neo4jTransactionManager transactionManager() throws Exception {
        return new Neo4jTransactionManager(sessionFactory());
    }

}

BaseEntity.java

package com.ideafan.server.neo4j.node;

import org.neo4j.ogm.annotation.NodeEntity;

import com.ideafan.server.neo4j.BaseNodeEntity;

@NodeEntity
public class Fan extends BaseNodeEntity {

    String firstName;

    public Fan() {}

    public Fan(String firstName) {
        super();
        this.firstName = firstName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

}

public abstract class BaseNodeEntity extends BaseEntity {

}

package com.ideafan.server.neo4j;

import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.id.UuidStrategy;

public abstract class BaseEntity {

    @Id @GeneratedValue(strategy = UuidStrategy.class)
    private String uuid;

}

@Repository
public interface FanRepository extends Neo4jRepository<Fan, String> {

    Fan findByFirstName(String firstName);

}

@SpringBootApplication
public class IdeaFanServerApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(IdeaFanServerApplication.class, args);

        DataPopulatorService dataPopulatorService = applicationContext.getBean(DataPopulatorService.class);

        dataPopulatorService.populateSampleData();
    }

}

@Service
@Transactional
public class DataPopulatorService {

    private Logger logger = LogManager.getLogger();

    @Autowired private FanRepository fanRepository;

    public void populateSampleData() {

        Fan fan = new Fan("Fan");
        fanRepository.save(fan);

    }

}

@Configuration
@ComponentScan({"com.ideafan.server.controller"})
public class AppConfig {

    @Bean
    public DataPopulatorService dataPopulatorService() {
        return new DataPopulatorService();
    }

}

@Configuration
@ComponentScan("com.ideafan.server.neo4j")
@EnableNeo4jRepositories(basePackages = "com.ideafan.server.neo4j.repository")
@EnableTransactionManagement
public class PersistenceContext {

    @Bean
    public SessionFactory sessionFactory() {
        // with domain entity base package(s)
        return new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");
    }

    @Bean
    public org.neo4j.ogm.config.Configuration configuration() {

        // Configuration reference: https://neo4j.com/docs/ogm-manual/current/reference/#reference:configuration
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()
                .uri("bolt://neo4j:password@localhost") // Note: neo4j is the username and password is the password.
                .build();
        return configuration;

    }

    @Bean
    public Neo4jTransactionManager transactionManager() throws Exception {
        return new Neo4jTransactionManager(sessionFactory());
    }

}

FanRepository.java

package com.ideafan.server.neo4j.node;

import org.neo4j.ogm.annotation.NodeEntity;

import com.ideafan.server.neo4j.BaseNodeEntity;

@NodeEntity
public class Fan extends BaseNodeEntity {

    String firstName;

    public Fan() {}

    public Fan(String firstName) {
        super();
        this.firstName = firstName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

}

public abstract class BaseNodeEntity extends BaseEntity {

}

package com.ideafan.server.neo4j;

import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.id.UuidStrategy;

public abstract class BaseEntity {

    @Id @GeneratedValue(strategy = UuidStrategy.class)
    private String uuid;

}

@Repository
public interface FanRepository extends Neo4jRepository<Fan, String> {

    Fan findByFirstName(String firstName);

}

@SpringBootApplication
public class IdeaFanServerApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(IdeaFanServerApplication.class, args);

        DataPopulatorService dataPopulatorService = applicationContext.getBean(DataPopulatorService.class);

        dataPopulatorService.populateSampleData();
    }

}

@Service
@Transactional
public class DataPopulatorService {

    private Logger logger = LogManager.getLogger();

    @Autowired private FanRepository fanRepository;

    public void populateSampleData() {

        Fan fan = new Fan("Fan");
        fanRepository.save(fan);

    }

}

@Configuration
@ComponentScan({"com.ideafan.server.controller"})
public class AppConfig {

    @Bean
    public DataPopulatorService dataPopulatorService() {
        return new DataPopulatorService();
    }

}

@Configuration
@ComponentScan("com.ideafan.server.neo4j")
@EnableNeo4jRepositories(basePackages = "com.ideafan.server.neo4j.repository")
@EnableTransactionManagement
public class PersistenceContext {

    @Bean
    public SessionFactory sessionFactory() {
        // with domain entity base package(s)
        return new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");
    }

    @Bean
    public org.neo4j.ogm.config.Configuration configuration() {

        // Configuration reference: https://neo4j.com/docs/ogm-manual/current/reference/#reference:configuration
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()
                .uri("bolt://neo4j:password@localhost") // Note: neo4j is the username and password is the password.
                .build();
        return configuration;

    }

    @Bean
    public Neo4jTransactionManager transactionManager() throws Exception {
        return new Neo4jTransactionManager(sessionFactory());
    }

}

DataPopulatorService.java

package com.ideafan.server.neo4j.node;

import org.neo4j.ogm.annotation.NodeEntity;

import com.ideafan.server.neo4j.BaseNodeEntity;

@NodeEntity
public class Fan extends BaseNodeEntity {

    String firstName;

    public Fan() {}

    public Fan(String firstName) {
        super();
        this.firstName = firstName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

}

public abstract class BaseNodeEntity extends BaseEntity {

}

package com.ideafan.server.neo4j;

import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.id.UuidStrategy;

public abstract class BaseEntity {

    @Id @GeneratedValue(strategy = UuidStrategy.class)
    private String uuid;

}

@Repository
public interface FanRepository extends Neo4jRepository<Fan, String> {

    Fan findByFirstName(String firstName);

}

@SpringBootApplication
public class IdeaFanServerApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(IdeaFanServerApplication.class, args);

        DataPopulatorService dataPopulatorService = applicationContext.getBean(DataPopulatorService.class);

        dataPopulatorService.populateSampleData();
    }

}

@Service
@Transactional
public class DataPopulatorService {

    private Logger logger = LogManager.getLogger();

    @Autowired private FanRepository fanRepository;

    public void populateSampleData() {

        Fan fan = new Fan("Fan");
        fanRepository.save(fan);

    }

}

@Configuration
@ComponentScan({"com.ideafan.server.controller"})
public class AppConfig {

    @Bean
    public DataPopulatorService dataPopulatorService() {
        return new DataPopulatorService();
    }

}

@Configuration
@ComponentScan("com.ideafan.server.neo4j")
@EnableNeo4jRepositories(basePackages = "com.ideafan.server.neo4j.repository")
@EnableTransactionManagement
public class PersistenceContext {

    @Bean
    public SessionFactory sessionFactory() {
        // with domain entity base package(s)
        return new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");
    }

    @Bean
    public org.neo4j.ogm.config.Configuration configuration() {

        // Configuration reference: https://neo4j.com/docs/ogm-manual/current/reference/#reference:configuration
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()
                .uri("bolt://neo4j:password@localhost") // Note: neo4j is the username and password is the password.
                .build();
        return configuration;

    }

    @Bean
    public Neo4jTransactionManager transactionManager() throws Exception {
        return new Neo4jTransactionManager(sessionFactory());
    }

}

配置：

2018-02-04 16:34:49.207  INFO 11112 --- [           main] c.i.server.IdeaFanServerApplication      : Started IdeaFanServerApplication in 4.531 seconds (JVM running for 5.55)
Exception in thread "main" java.lang.NullPointerException
    at org.neo4j.ogm.context.MappingContext.nativeId(MappingContext.java:478)
    at org.neo4j.ogm.context.EntityGraphMapper.getNodeBuilder(EntityGraphMapper.java:278)
    at org.neo4j.ogm.context.EntityGraphMapper.mapEntity(EntityGraphMapper.java:216)
    at org.neo4j.ogm.context.EntityGraphMapper.map(EntityGraphMapper.java:127)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:80)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:41)
    at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:451)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.neo4j.transaction.SharedSessionCreator$SharedSessionInvocationHandler.invoke(SharedSessionCreator.java:131)
    at com.sun.proxy.$Proxy64.save(Unknown Source)
    at org.springframework.data.neo4j.repository.support.SimpleNeo4jRepository.save(SimpleNeo4jRepository.java:73)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:377)
    at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:636)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:600)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:580)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy70.save(Unknown Source)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService.populateSampleData(DataPopulatorService.java:25)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService$$FastClassBySpringCGLIB$$dd77d09f.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:747)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService$$EnhancerBySpringCGLIB$$4185cb29.populateSampleData(<generated>)
    at com.ideafan.server.IdeaFanServerApplication.main(IdeaFanServerApplication.java:18)

2018-02-04 16:10:25.373  INFO 11892 --- [           main] c.i.server.IdeaFanServerApplication      : Started IdeaFanServerApplication in 4.952 seconds (JVM running for 5.751)
2018-02-04 16:10:25.842  INFO 11892 --- [           main] o.n.o.drivers.bolt.request.BoltRequest   : Request: UNWIND {rows} as row MERGE (n:`Fan`{id: row.props.id}) SET n=row.props RETURN row.nodeRef as ref, ID(n) as id, row.type as type with params {rows=[{nodeRef=-1, type=node, props={firstName=Fan, id=45a22c54-27a0-47af-bb8e-f4b9d3195d94}}]}

AppConfig.java

package com.ideafan.server.neo4j.node;

import org.neo4j.ogm.annotation.NodeEntity;

import com.ideafan.server.neo4j.BaseNodeEntity;

@NodeEntity
public class Fan extends BaseNodeEntity {

    String firstName;

    public Fan() {}

    public Fan(String firstName) {
        super();
        this.firstName = firstName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

}

public abstract class BaseNodeEntity extends BaseEntity {

}

package com.ideafan.server.neo4j;

import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.id.UuidStrategy;

public abstract class BaseEntity {

    @Id @GeneratedValue(strategy = UuidStrategy.class)
    private String uuid;

}

@Repository
public interface FanRepository extends Neo4jRepository<Fan, String> {

    Fan findByFirstName(String firstName);

}

@SpringBootApplication
public class IdeaFanServerApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(IdeaFanServerApplication.class, args);

        DataPopulatorService dataPopulatorService = applicationContext.getBean(DataPopulatorService.class);

        dataPopulatorService.populateSampleData();
    }

}

@Service
@Transactional
public class DataPopulatorService {

    private Logger logger = LogManager.getLogger();

    @Autowired private FanRepository fanRepository;

    public void populateSampleData() {

        Fan fan = new Fan("Fan");
        fanRepository.save(fan);

    }

}

@Configuration
@ComponentScan({"com.ideafan.server.controller"})
public class AppConfig {

    @Bean
    public DataPopulatorService dataPopulatorService() {
        return new DataPopulatorService();
    }

}

@Configuration
@ComponentScan("com.ideafan.server.neo4j")
@EnableNeo4jRepositories(basePackages = "com.ideafan.server.neo4j.repository")
@EnableTransactionManagement
public class PersistenceContext {

    @Bean
    public SessionFactory sessionFactory() {
        // with domain entity base package(s)
        return new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");
    }

    @Bean
    public org.neo4j.ogm.config.Configuration configuration() {

        // Configuration reference: https://neo4j.com/docs/ogm-manual/current/reference/#reference:configuration
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()
                .uri("bolt://neo4j:password@localhost") // Note: neo4j is the username and password is the password.
                .build();
        return configuration;

    }

    @Bean
    public Neo4jTransactionManager transactionManager() throws Exception {
        return new Neo4jTransactionManager(sessionFactory());
    }

}

PersistenceContext.java

package com.ideafan.server.neo4j.node;

import org.neo4j.ogm.annotation.NodeEntity;

import com.ideafan.server.neo4j.BaseNodeEntity;

@NodeEntity
public class Fan extends BaseNodeEntity {

    String firstName;

    public Fan() {}

    public Fan(String firstName) {
        super();
        this.firstName = firstName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

}

public abstract class BaseNodeEntity extends BaseEntity {

}

package com.ideafan.server.neo4j;

import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.id.UuidStrategy;

public abstract class BaseEntity {

    @Id @GeneratedValue(strategy = UuidStrategy.class)
    private String uuid;

}

@Repository
public interface FanRepository extends Neo4jRepository<Fan, String> {

    Fan findByFirstName(String firstName);

}

@SpringBootApplication
public class IdeaFanServerApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(IdeaFanServerApplication.class, args);

        DataPopulatorService dataPopulatorService = applicationContext.getBean(DataPopulatorService.class);

        dataPopulatorService.populateSampleData();
    }

}

@Service
@Transactional
public class DataPopulatorService {

    private Logger logger = LogManager.getLogger();

    @Autowired private FanRepository fanRepository;

    public void populateSampleData() {

        Fan fan = new Fan("Fan");
        fanRepository.save(fan);

    }

}

@Configuration
@ComponentScan({"com.ideafan.server.controller"})
public class AppConfig {

    @Bean
    public DataPopulatorService dataPopulatorService() {
        return new DataPopulatorService();
    }

}

@Configuration
@ComponentScan("com.ideafan.server.neo4j")
@EnableNeo4jRepositories(basePackages = "com.ideafan.server.neo4j.repository")
@EnableTransactionManagement
public class PersistenceContext {

    @Bean
    public SessionFactory sessionFactory() {
        // with domain entity base package(s)
        return new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");
    }

    @Bean
    public org.neo4j.ogm.config.Configuration configuration() {

        // Configuration reference: https://neo4j.com/docs/ogm-manual/current/reference/#reference:configuration
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()
                .uri("bolt://neo4j:password@localhost") // Note: neo4j is the username and password is the password.
                .build();
        return configuration;

    }

    @Bean
    public Neo4jTransactionManager transactionManager() throws Exception {
        return new Neo4jTransactionManager(sessionFactory());
    }

}

日志（有错误）：

2018-02-04 16:34:49.207  INFO 11112 --- [           main] c.i.server.IdeaFanServerApplication      : Started IdeaFanServerApplication in 4.531 seconds (JVM running for 5.55)
Exception in thread "main" java.lang.NullPointerException
    at org.neo4j.ogm.context.MappingContext.nativeId(MappingContext.java:478)
    at org.neo4j.ogm.context.EntityGraphMapper.getNodeBuilder(EntityGraphMapper.java:278)
    at org.neo4j.ogm.context.EntityGraphMapper.mapEntity(EntityGraphMapper.java:216)
    at org.neo4j.ogm.context.EntityGraphMapper.map(EntityGraphMapper.java:127)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:80)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:41)
    at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:451)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.neo4j.transaction.SharedSessionCreator$SharedSessionInvocationHandler.invoke(SharedSessionCreator.java:131)
    at com.sun.proxy.$Proxy64.save(Unknown Source)
    at org.springframework.data.neo4j.repository.support.SimpleNeo4jRepository.save(SimpleNeo4jRepository.java:73)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:377)
    at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:636)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:600)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:580)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy70.save(Unknown Source)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService.populateSampleData(DataPopulatorService.java:25)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService$$FastClassBySpringCGLIB$$dd77d09f.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:747)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService$$EnhancerBySpringCGLIB$$4185cb29.populateSampleData(<generated>)
    at com.ideafan.server.IdeaFanServerApplication.main(IdeaFanServerApplication.java:18)

2018-02-04 16:10:25.373  INFO 11892 --- [           main] c.i.server.IdeaFanServerApplication      : Started IdeaFanServerApplication in 4.952 seconds (JVM running for 5.751)
2018-02-04 16:10:25.842  INFO 11892 --- [           main] o.n.o.drivers.bolt.request.BoltRequest   : Request: UNWIND {rows} as row MERGE (n:`Fan`{id: row.props.id}) SET n=row.props RETURN row.nodeRef as ref, ID(n) as id, row.type as type with params {rows=[{nodeRef=-1, type=node, props={firstName=Fan, id=45a22c54-27a0-47af-bb8e-f4b9d3195d94}}]}

日志（无错误）：

2018-02-04 16:34:49.207  INFO 11112 --- [           main] c.i.server.IdeaFanServerApplication      : Started IdeaFanServerApplication in 4.531 seconds (JVM running for 5.55)
Exception in thread "main" java.lang.NullPointerException
    at org.neo4j.ogm.context.MappingContext.nativeId(MappingContext.java:478)
    at org.neo4j.ogm.context.EntityGraphMapper.getNodeBuilder(EntityGraphMapper.java:278)
    at org.neo4j.ogm.context.EntityGraphMapper.mapEntity(EntityGraphMapper.java:216)
    at org.neo4j.ogm.context.EntityGraphMapper.map(EntityGraphMapper.java:127)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:80)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:41)
    at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:451)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.neo4j.transaction.SharedSessionCreator$SharedSessionInvocationHandler.invoke(SharedSessionCreator.java:131)
    at com.sun.proxy.$Proxy64.save(Unknown Source)
    at org.springframework.data.neo4j.repository.support.SimpleNeo4jRepository.save(SimpleNeo4jRepository.java:73)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:377)
    at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:636)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:600)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:580)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy70.save(Unknown Source)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService.populateSampleData(DataPopulatorService.java:25)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService$$FastClassBySpringCGLIB$$dd77d09f.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:747)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
    at com.ideafan.server.service.admin.datapopulator.DataPopulatorService$$EnhancerBySpringCGLIB$$4185cb29.populateSampleData(<generated>)
    at com.ideafan.server.IdeaFanServerApplication.main(IdeaFanServerApplication.java:18)

2018-02-04 16:10:25.373  INFO 11892 --- [           main] c.i.server.IdeaFanServerApplication      : Started IdeaFanServerApplication in 4.952 seconds (JVM running for 5.751)
2018-02-04 16:10:25.842  INFO 11892 --- [           main] o.n.o.drivers.bolt.request.BoltRequest   : Request: UNWIND {rows} as row MERGE (n:`Fan`{id: row.props.id}) SET n=row.props RETURN row.nodeRef as ref, ID(n) as id, row.type as type with params {rows=[{nodeRef=-1, type=node, props={firstName=Fan, id=45a22c54-27a0-47af-bb8e-f4b9d3195d94}}]}

---

有人能看到问题所在吗？

所有节点类都应该在同一个包中。要进行扫描，请尝试将所有类移动到与class

Fan

相同的包中。简言之，在本文件包中：

new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");

---

更新：在将

@Id

字段放入基本抽象类中时，请确保您也按照使用

@NodeEntity

注释基本抽象类。

所有节点类都应该在同一个包中才能被扫描，请尝试将所有类移动到与class

Fan

相同的包中。简言之，在本文件包中：

new SessionFactory(configuration(), "com.ideafan.server.neo4j.node");

---

更新：在将

@Id

字段放在基本抽象类中时，请确保您也按照使用

@NodeEntity

注释基本抽象类。

谢谢，这很有意义。我已经做了更改，但是现在得到了一个不满意的例外。可能是因为我需要根据这个引用（）对SessionFactory进行一些设置？尽管我实例化SessionFactory的当前方式不应该也起作用吗？这是我现在遇到的错误：设置构造函数参数时无法解析对bean“SessionFactory”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“sessionFactory”的bean时出错，该bean在类路径资源[com/ideafan/server/PersistenceContext.class]中定义：通过工厂方法实例化bean失败；嵌套异常为org.springframework.beans.beanstantiationException:未能实例化[org.neo4j.ogm.session.SessionFactory]：工厂方法“SessionFactory”引发异常；嵌套异常是java.lang.NullPointerException看起来您还需要用“@NodeEntity”注释抽象的

BaseEntity

类根据下面的讨论：@Coder Shark，这解决了您的问题吗？如果是的话，我想更新我的答案是的，当然可以！请用新信息更新您的答案（我用附加信息对您的答案进行了编辑，但似乎并没有通过）。谢谢你，这很有道理。我已经做了更改，但是现在得到了一个不满意的例外。可能是因为我需要根据这个引用（）对SessionFactory进行一些设置？尽管我实例化SessionFactory的当前方式不应该也起作用吗？这是我现在遇到的错误：设置构造函数参数时无法解析对bean“SessionFactory”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“sessionFactory”的bean时出错，该bean在类路径资源[com/ideafan/server/PersistenceContext.class]中定义：通过工厂方法实例化bean失败；嵌套异常为org.springframework.beans.beanstantiationException:未能实例化[org.neo4j.ogm.session.SessionFactory]：工厂方法“SessionFactory”引发异常；嵌套异常是java.lang.NullPointerException看起来您还需要用“@NodeEntity”注释抽象的

BaseEntity

类根据下面的讨论：@Coder Shark，这解决了您的问题吗？如果是的话，我想更新我的答案是的，当然可以！请用新信息更新您的答案（我用附加信息对您的答案进行了编辑，但似乎并没有通过）。谢谢