我使用的是Neo4j 3.0.6，neo4j-ogm 2.0.5，Spring boot starter 1.4.1 RELEASE，Lucene 5.5.2
这是我的Machine和machineSectionSummary类（我只发布字段，实际上有属性和构造函数）。当我调用updateMachineSectionSummary函数时，在调用此函数并重新启动程序后，我无法调用machineRepository.findByName并得到以下错误。我怎样才能解决这个问题？我已经尝试删除日期，更改关系名称，但它不起作用
@NodeEntity
public class Machine {
@GraphId
Long graphId;
String id;
private String name;
private String field;
private Date startDate;
private Date endDate;
@Relationship(type = "HAS_DEPTH_UNIT", direction = "OUTGOING")
private Unit depthUnit;
private Double duration;
@Relationship(type = "HAS_DURATION_UNIT", direction = "OUTGOING")
private Unit durationUnit;
private Double cost;
@Relationship(type = "HAS_CURRENCY", direction = "OUTGOING")
private Currency currency;
private Double exchangeRate;
@Transient
private Boolean maxCost;
}
@NodeEntity
public class MachineSectionSummary {
@GraphId
Long graphId;
String id;
@Relationship(type = "HAS_MACHINE", direction = "OUTGOING")
private Machine machine;
private String sectionGroup;
private String category;
private Double duration;
private Double percentDuration;
private Double cost;
private Double percentCost;
@Relationship(type = "HAS_CURRENCY", direction = "OUTGOING")
private Currency currency;
}
在这个函数中，当我尝试findById时，它在第一次运行时正常工作（在清除数据库并运行程序之后），但在我停止并重新运行程序之后，它总是出错。
public void updateMachineSectionSummary(String id) {
Machine currentMachine = findById(id);
if (currentMachine == null) {
return;
}
Engine currentEngine = engineService.findByMachineIdAndName(currentMachine.getId(), "Value");
if (currentEngine == null) {
return;
}
List<LineItem> currentLineItemList = lineItemService.findByEngineIdAndActivityTypeOrderByNoAsc(currentEngine.getId(), "Inside");
List<String> sectionGroupList = new ArrayList<String>();
sectionGroupList.add("Section 1");
sectionGroupList.add("Section 2");
sectionGroupList.add("Section 3");
sectionGroupList.add("Section 4");
for (String sectionGroup : sectionGroupList) {
Double durationTotal = currentLineItemList.stream().filter(d -> d.getSection().getGroup().equalsIgnoreCase(sectionGroup))
.mapToDouble(LineItem::getDuration).sum();
durationTotal = durationTotal / 24;
Double percentDurationTotal = (durationTotal / durationTotal) * 100.0;
MachineSectionSummary currentWSSTotal = machineSectionSummaryService.findByMachineNameAndSectionGroupAndCategory(currentMachine.getName(),
sectionGroup, "Total");
if (currentWSSTotal != null) {
currentWSSTotal.setDuration(durationTotal);
currentWSSTotal.setPercentDuration(percentDurationTotal);
machineSectionSummaryService.save(currentWSSTotal);
}
}
}
运行程序时这是日志错误（第二次）
java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_66]
at org.neo4j.ogm.entity.io.MethodWriter.write(MethodWriter.java:40) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.entity.io.MethodWriter.write(MethodWriter.java:70) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.context.GraphEntityMapper.writeProperty(GraphEntityMapper.java:234) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.context.GraphEntityMapper.setProperties(GraphEntityMapper.java:186) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.context.GraphEntityMapper.mapNodes(GraphEntityMapper.java:162) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.context.GraphEntityMapper.mapEntities(GraphEntityMapper.java:145) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.context.GraphEntityMapper.map(GraphEntityMapper.java:120) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.context.GraphRowListModelMapper.map(GraphRowListModelMapper.java:56) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.session.delegates.LoadByTypeDelegate.loadAll(LoadByTypeDelegate.java:94) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.session.delegates.LoadByTypeDelegate.loadAll(LoadByTypeDelegate.java:157) ~[neo4j-ogm-core-2.0.5.jar:na]
at org.neo4j.ogm.session.Neo4jSession.loadAll(Neo4jSession.java:226) ~[neo4j-ogm-core-2.0.5.jar:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_66]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at com.sun.proxy.$Proxy77.loadAll(Unknown Source) ~[na:na]
at org.springframework.data.neo4j.repository.query.derived.DerivedGraphRepositoryQuery.execute(DerivedGraphRepositoryQuery.java:65) ~[spring-data-neo4j-4.1.3.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:482) ~[spring-data-commons-1.12.3.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460) ~[spring-data-commons-1.12.3.RELEASE.jar:na]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) ~[spring-data-commons-1.12.3.RELEASE.jar:na]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at com.sun.proxy.$Proxy116.findByName(Unknown Source) ~[na:na]
at com.test.wp.service.MachineServiceImpl.findByName(MachineServiceImpl.java:58) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_66]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at com.sun.proxy.$Proxy121.findByName(Unknown Source) ~[na:na]
at com.test.wp.service.InitializationServiceImpl.initGlobalOffsetMachines(InitializationServiceImpl.java:998) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_66]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at..
更新
我在Github创建了sampleProject。希望这个样本有用。谢谢
答案 0 :(得分：4)
这有两个部分：第一部分涉及你的代码，第二部分是OGM在遇到这种情况时应该做的事情。
MachineSectionSummary有一个名为Double percentDuration的字段。初始化数据库时，它会将每个实例设置为0.0。第一次运行/initMachineSectionSummary时，它会调用updateMachineSectionSummary()
介绍此问题的一行是：Double percentDurationTotal = (durationTotal / durationTotal) * 100.0;。创建durationTotal的表达式始终返回0.0。此计算将生成NaN，然后我们会在MachineSectionSummary.percentDuration上设置。然后OGM将此值保存到Neo4j。当您尝试从数据库中检索NaN值并将其映射回MachineSectionSummary时，您会发现问题。此时的OGM期待一个Double但得到一个名为＆＃34; NaN＆＃34;取而代之的是例外：java.lang.IllegalArgumentException: argument type mismatch。
过去曾参与很多数字项目，我的建议是阻止NaN出现;那就是做一些可能来源的防御性编码。这应该可以解决您的主要问题。
这引入了第二个问题：我们期望OGM在这里做些什么？在某些情况下，某些用户可能希望将NaN存储在数据库中。有些用户可能希望确保NaN始终为null。无论哪种方式，OGM都应该通过更好的错误消息提醒开发人员。