Java 导致无法在Spring数据Neo4j starter和OGM SessionFactory中使用uuid的null属性值合并节点的原因是什么？

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，为什么要问这个问题

我有一个

domain

对象，它使用

uuid

作为唯一id，声明如下

@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
}

@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
}

TestNodeTarget的

TestNodeTarget

如下所示

@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
}

@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
}

我正在使用

Spring-Boot 2.0.3。使用
sprng-Boot-data-neo4j
starter释放
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
neo4jogm会话工厂
构建我自己的通用DAO层，而不是限制我访问的Spring数据存储库


所有域的单一存储库（即loadById（classType，id））
运行自定义密码查询
还有一些我不记得的原因

问题
我能够执行
创建
、
读取
和
删除
操作。
PUT
操作具有以下假设

以前创建的
tn:TestNode
，
t1:TestNodeTarget
和
t2:TestNodeTarget
tn
节点与
t1
节点有关系
检索
tn
节点，
t1&t2
节点
将
tn
节点关系从
t1
呼叫会话。保存
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
错误
的根本原因是什么：org.neo4j.driver.v1.exceptions.ClientException:无法使用uuid
消息的null属性值合并节点？节点
uuid
值不为空
螺栓驱动程序和neo4j java驱动程序如何相互通信？我惊讶地看到
neo4jjava驱动程序
既然我正在使用
Neo4j OGM
来支持Spring数据的
Repository
，那么我可以放弃
Spring-boot-starter-Data-Neo4j
？如果是，那么
@Transactional
和事务管理会发生什么变化
TL；博士
使用带有
@Id
注释的
UUID
字段并不能替代
专用长Id
字段（或者是吗？）。将
id
字段添加到类中，异常将消失

我迫不及待地决定亲自调试这个问题并分享我的发现

交易
起初，
PUT
操作正常工作（没有
private Long id
字段），但未能删除旧关系，基于此，我将操作包装在
@Transactional
中，并获得了异常。取得了一些进展

在
ORM
上下文中，上述方法可以很好地工作。换句话说，我可以
从
@Transactional
注释的服务层中检索
实体，在
非事务
层中进行必要的更改，然后使用另一个用
@Transactional
注释的服务层方法
持久化
实体。对于
OGM
您必须在同一事务层中完成所有操作。哼

例外
如上面的问题所示，
TestNode
实体使用
UUID
如下

@Id @GeneratedValue(strategy = UuidStrategy.class) 
@Convert(UuidStringConverter.class)
private UUID uuid;

我必须更新
TestNode
类以包含

private Long id; 

在此之后，
PUT
操作按预期工作，旧关系被删除

混乱
为什么缺少
私有长id仅在更新期间导致异常？为什么不在
检索
、
删除
或
创建
实体时执行此操作