在 Springboot Mybatis 中连接 Neo4j 时发生 java.lang.StackOverflowError

分类：编程问答

如何解决在 Springboot Mybatis 中连接 Neo4j 时发生 java.lang.StackOverflowError

正如标题所暗示的，我在Springboot中用Mybatis连接Neo4j时遇到了StackOverFlow问题。 CQL 在 Neo4j 桌面上运行良好，但 api 返回 500 结果，在映射器中使用相同的 CQL。

错误信息如下：

2020-12-31 20:22:24.560 ERROR 31232 --- [nio-9090-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.StackOverflowError] with root cause

java.lang.StackOverflowError: null
    at java.io.WinNTFileSystem.normalizePrefix(WinNTFileSystem.java:186) ~[na:1.8.0_261]
    at java.io.WinNTFileSystem.normalize(WinNTFileSystem.java:111) ~[na:1.8.0_261]
    at java.io.WinNTFileSystem.normalize(WinNTFileSystem.java:93) ~[na:1.8.0_261]
    at java.io.File.<init>(File.java:279) ~[na:1.8.0_261]
    at java.io.FilePermission$1.run(FilePermission.java:224) ~[na:1.8.0_261]
    at java.io.FilePermission$1.run(FilePermission.java:212) ~[na:1.8.0_261]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_261]
    at java.io.FilePermission.init(FilePermission.java:212) ~[na:1.8.0_261]
    at java.io.FilePermission.<init>(FilePermission.java:299) ~[na:1.8.0_261]
    at sun.net.www.protocol.file.FileURLConnection.getPermission(FileURLConnection.java:228) ~[na:1.8.0_261]
    at sun.net.www.protocol.jar.JarFileFactory.getPermission(JarFileFactory.java:166) ~[na:1.8.0_261]
    at sun.net.www.protocol.jar.JarFileFactory.getCachedJarFile(JarFileFactory.java:136) ~[na:1.8.0_261]
    at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:91) ~[na:1.8.0_261]
    at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:122) ~[na:1.8.0_261]
    at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:152) ~[na:1.8.0_261]
    at java.net.URLClassLoader.getResourceAsStream(URLClassLoader.java:239) ~[na:1.8.0_261]
    at java.lang.Class.getResourceAsStream(Class.java:2223) ~[na:1.8.0_261]
    at org.neo4j.jdbc.DatabaseMetaData.<init>(DatabaseMetaData.java:100) ~[neo4j-jdbc-driver-3.1.0.jar:na]
    at org.neo4j.jdbc.http.HttpDatabaseMetaData.<init>(HttpDatabaseMetaData.java:34) ~[neo4j-jdbc-driver-3.1.0.jar:na]
    at org.neo4j.jdbc.http.HttpDatabaseMetaData.<init>(HttpDatabaseMetaData.java:43) ~[neo4j-jdbc-driver-3.1.0.jar:na]
    at org.neo4j.jdbc.http.HttpConnection.getMetaData(HttpConnection.java:105) ~[neo4j-jdbc-driver-3.1.0.jar:na]
    at org.neo4j.jdbc.http.HttpConnection.getMetaData(HttpConnection.java:40) ~[neo4j-jdbc-driver-3.1.0.jar:na]
    at com.zaxxer.hikari.pool.ProxyConnection.getMetaData(ProxyConnection.java:380) ~[HikariCP-3.4.5.jar:na]
    at com.zaxxer.hikari.pool.HikariProxyConnection.getMetaData(HikariProxyConnection.java) ~[HikariCP-3.4.5.jar:na]
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getNextResultSet(DefaultResultSetHandler.java:256) ~[mybatis-3.5.2.jar:3.5.2]
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getNextResultSet(DefaultResultSetHandler.java:261) ~[mybatis-3.5.2.jar:3.5.2]
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getNextResultSet(DefaultResultSetHandler.java:261) ~[mybatis-3.5.2.jar:3.5.2]
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getNextResultSet(DefaultResultSetHandler.java:261) ~[mybatis-3.5.2.jar:3.5.2]

（最后一行重复了数百次）

这是我的配置和代码：

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.neo4j.dw</groupId>
    <artifactId>dw</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>amazonMovies</name>
    <description>Amazon Movies Data Warehouse</description>

    <!--    <properties>-->
    <!--        <java.version>1.8</java.version>-->
    <!--    </properties>-->

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-neo4j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
<!--        Neo4j-->
        <dependency>
            <groupId>org.neo4j</groupId>
            <artifactId>neo4j-jdbc-driver</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!-- mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- solve: java.lang.NumberFormatException: For input string: "" -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-bean-validators</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- mp -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.0</version>
            <exclusions>
                <exclusion>
                    <artifactId>mybatis</artifactId>
                    <groupId>org.mybatis</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.9.0</version>
        </dependency>
        <!-- fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20190722</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk16</artifactId>
            <version>1.46</version>
        </dependency>

        <!--分页插件 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>3.4.0</version>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.neo4j.dw.DwApplication</mainClass>
                    <excludes>
                        <exclude>
                            <groupId>org.springframework.boot</groupId>
                            <artifactId>spring-boot-configuration-processor</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>

    </build>

</project>

mybatis_config.xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="org.neo4j.jdbc.http.HttpDriver"/>
                <property name="url" value="jdbc:neo4j:http://localhost:7474"/>
                <property name="username" value="neo4j"/>
                <property name="password" value="ETL2020"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="./mapper/*.xml"/>
    </mappers>
</configuration>

应用程序.yml

spring:
  datasource:
    driver-class-name: org.neo4j.jdbc.http.HttpDriver
    url: jdbc:neo4j:http://localhost:7474
    username: neo4j
    password: ETL2020

mybatis-plus:
  mapper-locations: classpath*:/mapper/**Mapper.xml
  type-aliases-package: com.neo4j.dw.Model

server:
  port: 9090

测试控制器

package com.neo4j.dw.Controller;

import com.neo4j.dw.Model.User;
import com.neo4j.dw.Service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;

@RestController
@RequestMapping("/test")
public class TestController {
    @Autowired
    private TestService testService;

    @GetMapping("/hello")
    public String hello(){
        return "hello";
    }

    @GetMapping("/user")
    public ArrayList<User> getUsers() {
        return testService.selectUsers();
    }
}

TestServiceImpl

package com.neo4j.dw.Service.Impl;

import com.neo4j.dw.Mapper.TestMapper;
import com.neo4j.dw.Model.User;
import com.neo4j.dw.Service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;

@Service
public class TestServiceImpl implements TestService {
    @Autowired
    private TestMapper testMapper;

    @Override
    public ArrayList<User> selectUsers(){
        return testMapper.selectUsers();
    }
}

测试映射器

package com.neo4j.dw.Mapper;

import com.neo4j.dw.Model.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.ArrayList;

@Mapper
public interface TestMapper {

    ArrayList<User> selectUsers();
}

用户

package com.neo4j.dw.Model;

import lombok.*;
import com.baomidou.mybatisplus.annotation.TableField;

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
@Getter
@Setter
public class User {
    @TableField("userId")
    public String userId;

    @TableField("profileName")
    public String profileName;
}

TestMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.neo4j.dw.Mapper.TestMapper">
    <select id="selectUsers" resultType="int">
        MATCH (n1)-[r]->(n2) RETURN count(*)
    </select>
</mapper>

我是 Neo4j 和 Mybatis 的新手。 谁能帮我弄清楚如何解决这个错误？ 感谢一百万！

解决方法

据我所知，MyBatis 没有集成在：

  • Spring Data Neo4j 5（通过 POM 中的 spring-boot-starter-data-neo4j 添加，直到 Spring Boot 2.3 为止）
  • 也不是 Neo4j OGM（Spring Data Neo4j 5 所基于的库）。

如果您想开始，您可能应该开始使用 Spring Data Neo4j 6（又名 SDN 6），即撰写本文时最新版本的 Spring Data Neo4j。如果您将 Spring Boot 升级到最新版本（在撰写本文时为 2.4），您将自动获得它。

您可能应该从 SDN 6 的 reference documentation 开始。 您还可以找到示例 here。

正如您将了解到的，您可以摆脱 MyBatis，SDN 6（和 5 通过 Neo4j OGM）已经负责映射。

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