SDN4 java.lang.ClassCastException:使用AttributeConverter时，无法将java.lang.Integer转换为java.lang.Long

首先，我可能会在这里做一些不必要的事情，但我相信问题与此无关。我正在尝试使用此转换器类在neo4j中存储

ZonedDateTime

值：

public class ZonedDateTimeConverter implements AttributeConverter<ZonedDateTime, Long> {
    @Override
    public Long toGraphProperty(ZonedDateTime value) {
        return value != null ? value.toEpochSecond() : null;
    }

    @Override
    public ZonedDateTime toEntityAttribute(Long value) {
        if (value == null) return null;
        Instant i = Instant.ofEpochSecond(value);
        ZoneId zoneId = ZoneId.systemDefault();
        return ZonedDateTime.ofInstant(i, zoneId);
    }
}

---

这是一个bug还是我在如何工作方面犯了一个错误？

问题是，当通过线路返回查询结果时，JSON会丢失类型信息；在这种情况下，数值被解释为整数

---

将转换器更改为handle

Number

时应注意这一点。这里有一个例子：

问题是，当通过线路返回查询结果时，JSON会丢失类型信息；在这种情况下，数值被解释为整数

---

将转换器更改为handle

Number

时应注意这一点。下面是一个示例：

这似乎可行，但我看不到这些日期存储在图形中的什么位置。它将作为属性值存储在为带注释的属性postDate定义此转换器的节点上。如果我使用

匹配（t:Transaction）返回t

，则每个结果都没有postDate字段。使用Spring存储库返回结果，我可以看到日期字段已填充。这个值存储在哪里？实际上，日期字段似乎是从上一次插入中缓存的。如果我重新启动web服务器并尝试检索结果，则没有postDate。我的实体属性是

@Convert（ZonedDateTimeConverter.class）public ZonedDateTime postDate

事实上，SDN4在更新实体上的postDate字段时使用的密码是：

{“statements”：[{“statement”：“MATCH（$44）WHERE id（$44）={$44}MATCH（$43）WHERE id（$43）={$43}MERGE（$44）-[\u0:`CATEGORY`]->（$43）WITH$43，$44，\u0 MATCH（$50）WHERE id（$50）={$50}MERGE（$44）[\u1:`INSTITUTION INSTITUTION 0）RETURN id（`0）AS{$0）AS{$0，id（`1）AS `->，“parameters”：{“$43”：43，“$44”：44，“$50”：50}，“resultDataContents”：[“row”]，“includeStats”：false}]}

这似乎有效，但我看不到这些日期存储在图形中的什么位置。如果我使用

匹配（t:Transaction），它将作为属性值存储在为带注释的属性postDate定义此转换器的节点上RETURN t

则每个结果都没有postDate字段。使用Spring存储库返回结果时，我可以看到日期字段已填充。此值存储在哪里？实际上，日期字段似乎是从以前的插入中缓存的。如果我重新启动web服务器并尝试检索结果，则没有postDate。我的实体属性是

@Convert（ZonedDateTimeConverter.class）public ZonedDateTime postDate；

事实上，SDN4在更新实体上的postDate字段时使用的密码是：

{“statements”：[{“statement”：“MATCH（$44）WHERE id（$44）={$44}MATCH（$43）WHERE id（$43）={$43}MERGE（$44）-[[u 0:`CATEGORY`]->（$43）WITH$43），[u 0]MATCH（$50）WHERE id（$50}合并（$44）-[\u1:`INSTITUTION`]->（$50）返回id（\u0）为{u0，id（\u1）为{u1”，“参数：{“$43”：43，“$44”：44，“$50”：50}”，结果数据内容“：[“行”]，“includeStats”：false}

org.neo4j.ogm.metadata.MappingException: Error mapping GraphModel to instance of co.sens.data.models.Transaction
    at org.neo4j.ogm.mapper.GraphEntityMapper.mapEntities(GraphEntityMapper.java:97)
    at org.neo4j.ogm.mapper.GraphEntityMapper.map(GraphEntityMapper.java:69)
    at org.neo4j.ogm.session.response.SessionResponseHandler.loadById(SessionResponseHandler.java:149)
    at org.neo4j.ogm.session.delegates.LoadOneDelegate.load(LoadOneDelegate.java:45)
    at org.neo4j.ogm.session.delegates.LoadOneDelegate.load(LoadOneDelegate.java:36)
    at org.neo4j.ogm.session.Neo4jSession.load(Neo4jSession.java:99)
    at org.springframework.data.neo4j.repository.GraphRepositoryImpl.findOne(GraphRepositoryImpl.java:60)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:475)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:460)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:432)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy112.findOne(Unknown Source)
    at co.sens.data.AccountRepositoryTest.testTransactionsForAccount(AccountRepositoryTest.java:76)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163)
    at org.junit.runners.Suite.runChild(Suite.java:128)
    at org.junit.runners.Suite.runChild(Suite.java:27)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long
    at co.sens.data.ZonedDateTimeConverter.toEntityAttribute(ZonedDateTimeConverter.java:13)
    at org.neo4j.ogm.entityaccess.FieldWriter.write(FieldWriter.java:64)
    at org.neo4j.ogm.mapper.GraphEntityMapper.writeProperty(GraphEntityMapper.java:164)
    at org.neo4j.ogm.mapper.GraphEntityMapper.setProperties(GraphEntityMapper.java:129)
    at org.neo4j.ogm.mapper.GraphEntityMapper.mapNodes(GraphEntityMapper.java:110)
    at org.neo4j.ogm.mapper.GraphEntityMapper.mapEntities(GraphEntityMapper.java:94)
    ... 62 more