Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'transactionManager' defined in class path resource [org/springframework/boot/autoconfigure/data/neo4j/Neo4jDataAutoConfiguration.class]: Unsatisfied dependency expressed through method 'transactionManager' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [org/springframework/boot/autoconfigure/data/neo4j/Neo4jDataAutoConfiguration.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.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1178)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1072)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:511)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:220)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1016)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:344)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:339)
at org.springframework.transaction.interceptor.TransactionAspectSupport.determineTransactionManager(TransactionAspectSupport.java:384)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:272)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy106.getStoragePath(Unknown Source)
造成的原因是Neo4j 初始化sessionFactory 没有找到Neo4j 的事务管理器 transactionManager,查看SpringBoot 2.x 涉及Neo4j 自动注入配置对象：spring-boot-autoconfigure-x.x.x.release.jar的org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration.java。
问题核心：事务接口PlatformTransactionManager实例化冲突
myBatis 事务管理器实例化对象：spring-jdbc-x.x.x.release.jar
实例化对象：org.springframework.jdbc.datasource.DataSourceTransactionManager.java(注意：org.springframework.transaction.support.AbstractPlatformTransactionManager 实现PlatformTransactionManager 接口)
neo4j 事务管理器实例化对象：spring-data-neo4j-x.x.x.release.jar
实例化对象：org.springframework.data.neo4j.transaction.Neo4jTransactionManager (注意:org.springframework.transaction.support.AbstractPlatformTransactionManager 实现PlatformTransactionManager 接口)
现在的问题已经很明确 neo4j 与mybatis 事务冲突
解决办法是：放弃springboot 自动注入neo4j 的配置服务对象：org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration.java
使用spring 自定义neo4j 配置对象，核心功能代码如下：
package com.zzg.ucas.config;
import org.neo4j.ogm.session.SessionFactory;
import org.neo4j.ogm.session.transaction.DefaultTransactionManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.neo4j.repository.config.EnableNeo4jRepositories;
@Configuration
@EnableNeo4jRepositories("com.zzg.ucas.neo4j.repository") // 声明neo4j repository存放地址
public class Neo4jConfig {
@Bean
public org.neo4j.ogm.config.Configuration getConfiguration() {
org.neo4j.ogm.config.Configuration config = new org.neo4j.ogm.config.Configuration();
config.driverConfiguration()
.setDriverClassName("org.neo4j.ogm.drivers.http.driver.HttpDriver")
.setURI("http://neo4j:123456@192.168.0.1:7474");
return config;
}
@Bean(name="sessionFactory")
public SessionFactory getSessionFactory() {
/**
* 如果不指定节点映射的java bean路径，保存时会报如下警告，导致无法将节点插入Neo4j中
* ... is not an instance of a persistable class
*/
return new SessionFactory(getConfiguration(), "com.zzg.ucas.neo4j.ogm");
}
/**
* 解决MyBatis 事务与Neo4j 事务冲突
* @return
*/
@Bean
public DefaultTransactionManager getDefaultTransactionManager(){
return new DefaultTransactionManager(getSessionFactory().openSession());
}
}
