在Spring Data Neo4j启动程序和OGM SessionFactory中无法为uuid的null属性值合并节点的原因是什么？

时间：2018-07-06 02:59:32

标签： java spring-boot neo4j spring-data-neo4j neo4j-ogm

显然，这是一个常见的例外，但是，这里提出的所有问题似乎都与CSV有关，因此，为什么要提出这个问题。

我有一个domain对象，它使用uuid作为唯一ID，并声明为Follow 

@NodeEntity(label = "TNODE")
public class TestNode {
    @Id @GeneratedValue(strategy = UuidStrategy.class) 
    @Convert(UuidStringConverter.class)
    private UUID uuid;

    private String name; 

    @Relationship(type = "TEST_REL_IS", direction = Relationship.OUTGOING) private TestNodeTarget testTarget;

    public TestNode() {}
    public TestNode(String name, TestNodeTarget target) {
        this.name = name; 
        this.testTarget = target;
    }

    //getters and setters
}

TestNodeTarget如下

@NodeEntity(label = "TNODE_TARGET")
public class TestNodeTarget {
    private Long id; 
    private String name;

    public TestNodeTarget() {}
    public TestNodeTarget(String name) {
        this.name = name; 
    }

    //getters and setters
}

我正在将Spring Boot 2.0.3.RELEASE与sprng-boot-data-neo4j起动器一起使用，该起动器会拉低neo4j-ogm-core-3.1.0，neo4j-ogm-bolt-driver-3.1.0，neo4j-ogm-api-3.1.0和神秘的neo4j-java-driver-1.5。

我正在使用Neo4j OGM SessionFactory来构建自己的通用DAO层，而不是使用Spring Data Repository来限制我的访问权限

  • 所有域的单个存储库（即loadById（classType，id））
  • 运行自定义密码查询
  • 我不记得的其他一些原因

问题

我能够执行CREATE，READ和DELETE操作。遵循以下假设的PUT操作

  1. 先前创建的tn:TestNode，t1:TestNodeTarget和t2:TestNodeTarget
  2. tn节点与t1节点有关系
  3. 检索tn个节点，t1 & t2个节点
  4. 将tn的节点关系从t2更改为t1
  5. 致电session.save

例外是

Caused by: org.neo4j.driver.v1.exceptions.ClientException: Cannot merge node using null property value for uuid
    at org.neo4j.driver.internal.util.ErrorUtil.newNeo4jError(ErrorUtil.java:62)
    at org.neo4j.driver.internal.async.inbound.InboundMessageDispatcher.handleFailureMessage(InboundMessageDispatcher.java:137)
    at org.neo4j.driver.internal.messaging.PackStreamMessageFormatV1$Reader.unpackFailureMessage(PackStreamMessageFormatV1.java:432)
    at org.neo4j.driver.internal.messaging.PackStreamMessageFormatV1$Reader.read(PackStreamMessageFormatV1.java:396)
    at org.neo4j.driver.internal.async.inbound.InboundMessageHandler.channelRead0(InboundMessageHandler.java:83)
    at org.neo4j.driver.internal.async.inbound.InboundMessageHandler.channelRead0(InboundMessageHandler.java:35)
    at org.neo4j.driver.internal.shaded.io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)
    at org.neo4j.driver.internal.async.inbound.MessageDecoder.channelRead(MessageDecoder.java:40)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:297)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:413)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at org.neo4j.driver.internal.shaded.io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1336)
    at org.neo4j.driver.internal.shaded.io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1127)
    at org.neo4j.driver.internal.shaded.io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1162)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428)
    at org.neo4j.driver.internal.shaded.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at org.neo4j.driver.internal.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1359)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at org.neo4j.driver.internal.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at org.neo4j.driver.internal.shaded.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:935)
    at org.neo4j.driver.internal.shaded.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:134)
    at org.neo4j.driver.internal.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)
    at org.neo4j.driver.internal.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
    at org.neo4j.driver.internal.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
    at org.neo4j.driver.internal.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
    at org.neo4j.driver.internal.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
    at org.neo4j.driver.internal.shaded.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)

问题

  1. 错误Caused by: org.neo4j.driver.v1.exceptions.ClientException: Cannot merge node using null property value for uuid消息的根本原因是什么？节点uuid的值不为null。
  2. bolt-driver和neo4j-java-driver如何相互通信？我很惊讶地看到neo4j-java-driver。
  3. 既然我使用Neo4j OGM来代替Spring Data的Repository，那么我可以抛弃spring-boot-starter-data-neo4j吗？如果是，@Transactional和事务管理会怎样？

1 个答案:

答案 0 :(得分：1)

TL; DR

使用带有UUID注释的@Id字段不能代替private Long id字段（或者是？）。将id字段添加到类中，该异常消失。

我等不及了，决定自己调试此问题并分享我的发现

交易

首先，PUT操作（无private Long id字段）无一例外地工作，但是未能删除旧的关系，基于此Github issue，我将这些操作包装在{{1 }}，我得到了例外。一些进步。

在@Transactional上下文中，上述方法可以正常工作。换句话说，我可以ORM来自retrieve带注释的服务层的实体，在@Transactional层中进行必要的更改，然后使用另一种服务层方法non-transactional用persist注释。对于@Transactional，您必须在同一事务层中全部完成。哼！

例外

如上面的问题所示，OGM实体按如下方式使用TestNode 

UUID

我必须更新@Id @GeneratedValue(strategy = UuidStrategy.class) @Convert(UuidStringConverter.class) private UUID uuid; 类以包含

TestNode

然后，private Long id; 操作将按预期工作，并且旧的关系将被删除。

困惑

为什么缺少PUT只会在更新期间导致异常？为什么在您private Long id;，retrieve或delete实体时不这样做？

相关问题
最新问题