我尝试创建一个嵌入了neo4j的spring boot项目。 我的项目刚刚开始：目前还没有NodeEntities或存储库。
它仅包含SpringBootApplication类，一个虚拟rest控制器和Neo4jConfiguration文件。
我的问题：该应用程序无法启动。我得到：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getSessionFactory' defined in class path resource [eu/alkismavridis/mathasm/db/Neo4jConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'getSessionFactory' threw exception; nested exception is org.neo4j.ogm.exception.ConnectionException: Error connecting to embedded graph
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1247) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1096) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:535) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:333) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1277) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1265) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at eu.alkismavridis.mathasm.MathasmApplication.main(MathasmApplication.java:10) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'getSessionFactory' threw exception; nested exception is org.neo4j.ogm.exception.ConnectionException: Error connecting to embedded graph
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
... 18 common frames omitted
Caused by: org.neo4j.ogm.exception.ConnectionException: Error connecting to embedded graph
at org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver.configure(EmbeddedDriver.java:94) ~[neo4j-ogm-embedded-driver-3.1.2.jar:3.1.2]
at org.neo4j.ogm.session.SessionFactory.<init>(SessionFactory.java:82) ~[neo4j-ogm-core-3.1.2.jar:3.1.2]
at eu.alkismavridis.mathasm.db.Neo4jConfiguration.getSessionFactory(Neo4jConfiguration.java:35) ~[classes/:na]
at eu.alkismavridis.mathasm.db.Neo4jConfiguration$$EnhancerBySpringCGLIB$$cba62fa3.CGLIB$getSessionFactory$0(<generated>) ~[classes/:na]
at eu.alkismavridis.mathasm.db.Neo4jConfiguration$$EnhancerBySpringCGLIB$$cba62fa3$$FastClassBySpringCGLIB$$d6eed0e3.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:365) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at eu.alkismavridis.mathasm.db.Neo4jConfiguration$$EnhancerBySpringCGLIB$$cba62fa3.getSessionFactory(<generated>) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
... 19 common frames omitted
Caused by: java.lang.RuntimeException: Error starting org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory, /home/alkis/data
at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.initFacade(GraphDatabaseFacadeFactory.java:212) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:125) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.graphdb.factory.GraphDatabaseFactory.newDatabase(GraphDatabaseFactory.java:137) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:130) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:107) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:199) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:75) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver.setGraphDatabase(EmbeddedDriver.java:104) ~[neo4j-ogm-embedded-driver-3.1.2.jar:3.1.2]
at org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver.configure(EmbeddedDriver.java:91) ~[neo4j-ogm-embedded-driver-3.1.2.jar:3.1.2]
... 31 common frames omitted
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.NeoStoreDataSource@191a0351' was successfully initialized, but failed to start. Please see the attached cause exception "No dependency satisfies type class org.neo4j.kernel.api.index.IndexProvider".
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:466) ~[neo4j-common-3.4.8.jar:3.4.8]
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107) ~[neo4j-common-3.4.8.jar:3.4.8]
at org.neo4j.kernel.impl.transaction.state.DataSourceManager.start(DataSourceManager.java:100) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:445) ~[neo4j-common-3.4.8.jar:3.4.8]
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107) ~[neo4j-common-3.4.8.jar:3.4.8]
at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.initFacade(GraphDatabaseFacadeFactory.java:208) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
... 39 common frames omitted
Caused by: org.neo4j.kernel.impl.util.UnsatisfiedDependencyException: No dependency satisfies type class org.neo4j.kernel.api.index.IndexProvider
at org.neo4j.kernel.impl.util.Dependencies.resolveDependency(Dependencies.java:73) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.kernel.impl.util.Dependencies.resolveDependency(Dependencies.java:68) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.kernel.NeoStoreDataSource.start(NeoStoreDataSource.java:387) ~[neo4j-kernel-3.4.8.jar:3.4.8,fd05a33c832a50786889cc2ea5714baa31795459]
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:445) ~[neo4j-common-3.4.8.jar:3.4.8]
... 44 common frames omitted
我发现了类似的问题here，但是配置了gradle而不是maven，所以我无法真正应用其解决方案。
我的pom.xml是：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>eu.alkismavridis</groupId>
<artifactId>mathasm</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>mathasm</name>
<description>Some app</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-neo4j</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-java-tools</artifactId>
<version>5.2.4</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-neo4j</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-ogm-test</artifactId>
<version>3.1.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-ogm-embedded-driver</artifactId>
<version>3.1.2</version>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-kernel</artifactId>
<version>3.4.8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>kotlin-maven-plugin</artifactId>
<groupId>org.jetbrains.kotlin</groupId>
<version>${kotlin.version}</version>
<executions>
<execution>
<id>compile</id>
<goals> <goal>compile</goal> </goals>
</execution>
<execution>
<id>test-compile</id>
<goals> <goal>test-compile</goal> </goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
我的application.properties：
server.port=8080
spring.data.neo4j.embedded.enabled=true
还有我的Neo4j配置类：
package eu.alkismavridis.mathasm.db;
import org.neo4j.ogm.session.SessionFactory;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.neo4j.repository.config.EnableNeo4jRepositories;
import org.springframework.data.neo4j.transaction.Neo4jTransactionManager;
import org.neo4j.kernel.api.index.IndexProvider;
@Configuration
//@EnableNeo4jRepositories(basePackages = "eu.alkismavridis.mathasm")
@EntityScan("eu.alkismavridis.mathasm.core")
public class Neo4jConfiguration {
@Bean
public org.neo4j.ogm.config.Configuration getConfiguration() {
//org.neo4j.ogm.config.Configuration config = new org.neo4j.ogm.config.Configuration.Builder().build();
org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()
.uri("file:///home/alkis/data")
.build();
return configuration;
}
@Bean
public SessionFactory getSessionFactory() {
return new SessionFactory(getConfiguration(),
"com.baeldung.spring.data.neo4j.domain");
}
@Bean
public Neo4jTransactionManager transactionManager() {
return new Neo4jTransactionManager(getSessionFactory());
}
}
由于我无法真正理解问题的本质，因此我没有做很多尝试...直到现在，我都尝试从getConfiguration（）返回不同的配置，但是没有成功...
答案 0 :(得分：0)
我终于能够按照以下git repo的步骤解决我的问题： https://github.com/neo4j-examples/movies-java-spring-data-neo4j
步骤1。我包括了
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId
<version>3.2.9</version>
<scope>runtime</scope>
</dependency>
在我的pom.xml中，
步骤2。我将Neo4jConfiguration.getSessionFactory重命名为Neo4jConfiguration.sessionFactory
Setp 3.我将字符串“ com.baeldung.spring.data.neo4j.domain”更改为我的实体所在的实际包，从而解决了我的问题。该应用程序现在开始运行。