java - 我怎样才能让 java 和 neo4j 在 eclipse 中工作

Question

我使用的是 mint 17.2 并且有 neo4j 3.06 社区版，它在 localhost:7474 上运行良好。

我希望使用 Eclipse Mars 2 在 Java 1.08 中编程，但我无法让它工作。

我正在使用一个 maven 项目并且在我的 pom.xml 中包含以下内容

<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>com.geekcap.informit</groupId>
  <artifactId>neo4j-sample-app</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>neo4j-sample-app</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.neo4j.driver</groupId>
        <artifactId>neo4j-java-driver</artifactId>
        <version>1.0.3</version>
    </dependency>
  </dependencies>
</project>

我的 app.java 文件中有以下内容

package com.geekcap.informit.neo4j_sample_app;


import org.neo4j.driver.v1.*;

public class App 
{

    public static void main( String[] args )
    {
      Driver driver = GraphDatabase.driver("bolt://localhost:7474", AuthTokens.basic("neo4j", "neo4j"));
      Session session = driver.session();

      session.run("CREATE (a:Person {name:'Arthur', title:'King'})" );

      StatementResult result = 
          session.run("Match (a:Person) WHERE a.name = 'Arthur' RETURN a.name AS name, a.title AS title");
      while (result.hasNext()) {
        Record record = result.next();
        System.out.println(record.get("title").asString() + " " + 
            record.get("name").asString());
      }

      session.close();
      driver.close();
    }

当我尝试将其作为 Java 应用程序运行时出现以下错误。

Exception in thread "main" org.neo4j.driver.v1.exceptions.ClientException: Unable to process request: Unrecognized SSL message, plaintext connection?
  at org.neo4j.driver.internal.connector.socket.SocketClient.start(SocketClient.java:87)
  at org.neo4j.driver.internal.connector.socket.SocketConnection.<init>(SocketConnection.java:63)
  at org.neo4j.driver.internal.connector.socket.SocketConnector.connect(SocketConnector.java:52)
  at org.neo4j.driver.internal.pool.InternalConnectionPool$1.allocate(InternalConnectionPool.java:191)
  at org.neo4j.driver.internal.pool.InternalConnectionPool$1.allocate(InternalConnectionPool.java:180)
  at org.neo4j.driver.internal.pool.ThreadCachingPool.allocate(ThreadCachingPool.java:212)
  at org.neo4j.driver.internal.pool.ThreadCachingPool.acquireFromGlobal(ThreadCachingPool.java:164)
  at org.neo4j.driver.internal.pool.ThreadCachingPool.acquire(ThreadCachingPool.java:118)
  at org.neo4j.driver.internal.pool.InternalConnectionPool.acquire(InternalConnectionPool.java:109)
  at org.neo4j.driver.internal.InternalDriver.session(InternalDriver.java:53)
  at com.geekcap.informit.neo4j_sample_app.App.main(App.java:12)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
  at sun.security.ssl.EngineInputRecord.bytesInCompletePacket(EngineInputRecord.java:156)
  at sun.security.ssl.SSLEngineImpl.readNetRecord(SSLEngineImpl.java:868)
  at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:781)
  at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:624)
  at org.neo4j.driver.internal.connector.socket.TLSSocketChannel.unwrap(TLSSocketChannel.java:186)
  at org.neo4j.driver.internal.connector.socket.TLSSocketChannel.runHandshake(TLSSocketChannel.java:127)
  at org.neo4j.driver.internal.connector.socket.TLSSocketChannel.<init>(TLSSocketChannel.java:95)
  at org.neo4j.driver.internal.connector.socket.TLSSocketChannel.<init>(TLSSocketChannel.java:77)
  at org.neo4j.driver.internal.connector.socket.TLSSocketChannel.<init>(TLSSocketChannel.java:70)
  at org.neo4j.driver.internal.connector.socket.SocketClient$ChannelFactory.create(SocketClient.java:235)
  at org.neo4j.driver.internal.connector.socket.SocketClient.start(SocketClient.java:74)
  ... 10 more

Answer 1

7474 端口是 HTTP 端口。由于您使用的是 bolt:// 协议(protocol)，因此您应该连接到 7687 端口。或者实际删除端口，因为它是默认值:

Driver driver = GraphDatabase.driver("bolt://localhost", AuthTokens.basic("neo4j", "neo4j"));

还要确保 Bolt 协议(protocol)在 Neo4j 实例上实际处于 Activity 状态，方法是在 conf/neo4j.conf 中取消注释(删除前面的 #):

dbms.connector.bolt.address=0.0.0.0:7687

或者至少，限制为本地连接:

dbms.connector.bolt.address=127.0.0.1:7687