Spring Data Neo4j - Obtention d'une exception lors de l'exécution d'une requête chiffrée

Question

Je reçois une exception étrange lorsque j'essaie d'exécuter une requête de chiffrement simple. Je vais d'abord présenter mon code, puis je montrerai ce qui cause l'exception. Donc, j'ai les classes suivantes:

Une classe simple pour représenter un profil d'utilisateur:

public abstract class Profile extends AbstractEntity { 

    @Indexed 
    ProfileType profileType; 

    @Indexed(indexType = IndexType.FULLTEXT, indexName = "name") 
    String firstName; 

    @Indexed(indexType = IndexType.FULLTEXT, indexName = "name") 
    String lastName; 

    @Indexed 
    EyeColor eyeColor; 

    @Indexed  
    HairColor hairColor; 

    @Indexed 
    Nationality nationality; 

    @Indexed 
    int height; 

    public Profile() { 
     setProfileType(); 
    } 

    public Profile(String firstName, String lastName, Nationality nationality, EyeColor eyeColor, HairColor hairColor, int height) { 
     this(); 
     this.setFirstName(firstName); 
     this.setLastName(lastName); 
     this.setNationality(nationality); 
     this.setHairColor(hairColor); 
     this.setEyeColor(eyeColor); 
     this.setHeight(height); 
    } 

    /* Getters and Setters */ 
} 

Et une simple classe qui hérite de Profile, et représente un civil:

@NodeEntity 
public class Civilian extends Profile { 

    @GraphProperty(propertyType = Long.class) 
    DateTime dateOfBirth; 

    @Indexed 
    boolean missing; 

    @RelatedTo 
    @Fetch 
    Set<Casualty> casualties = new HashSet<Casualty>(); //TODO: design 

    public Civilian() { 
     this.profileType = ProfileType.CIVILIAN; 
    } 

    public Civilian(String firstName, String lastName, Nationality nationality, EyeColor eyeColor, HairColor hairColor, int height, DateTime dateOfBirth, boolean missing) { 
     super(firstName, lastName, nationality, eyeColor, hairColor, height); 
     this.setDateOfBirth(dateOfBirth); 
     this.setMissing(missing); 
    } 

    /* Getters and Setters */ 
} 

Alors J'ai créé le référentiel suivant pour la classe Civilian:

public interface CivilianRepository extends GraphRepository<Civilian> { 
    @Query("start n=node(*) where n.firstName=~{0} return n") 
    Page<Civilian> findCiviliansProperties(String firstName, Pageable page);  
} 

Ok. J'ai donc créé quelques Civilian nœuds, et peuplé le graphique avec eux. Il n'y a pas d'autres nœuds dans le graphique, à l'exception des nœuds Civilian. Quand je lance la méthode findCiviliansProperties, je reçois l'exception suivante:

Exception in thread "main" org.springframework.dao.InvalidDataAccessResourceUsageException: Error executing statement start n=node(*) where n.firstName=~{0} return n skip 0 limit 10; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: Error executing statement start n=node(*) where n.firstName=~{0} return n skip 0 limit 10; nested exception is org.neo4j.cypher.EntityNotFoundException: The property 'firstName' does not exist on Node[0] 
    at org.springframework.data.neo4j.support.query.CypherQueryEngine.query(CypherQueryEngine.java:52) 
    at org.springframework.data.neo4j.repository.query.GraphRepositoryQuery.dispatchQuery(GraphRepositoryQuery.java:98) 
    at org.springframework.data.neo4j.repository.query.GraphRepositoryQuery.execute(GraphRepositoryQuery.java:81) 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:312) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96) 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) 
    at com.sun.proxy.$Proxy33.findCiviliansProperties(Unknown Source) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198) 
    at com.sun.proxy.$Proxy36.findCiviliansProperties(Unknown Source) 
    at org.technion.socialrescue.playground.Playground.main(Playground.java:38) 
Caused by: org.springframework.dao.InvalidDataAccessResourceUsageException: Error executing statement start n=node(*) where n.firstName=~{0} return n skip 0 limit 10; nested exception is org.neo4j.cypher.EntityNotFoundException: The property 'firstName' does not exist on Node[0] 
    at org.springframework.data.neo4j.support.query.CypherQueryEngine.parseAndExecuteQuery(CypherQueryEngine.java:63) 
    at org.springframework.data.neo4j.support.query.CypherQueryEngine.query(CypherQueryEngine.java:49) 
    ... 20 more 
Caused by: org.neo4j.cypher.EntityNotFoundException: The property 'firstName' does not exist on Node[0] 
    at org.neo4j.cypher.internal.commands.expressions.Property.apply(Property.scala:35) 
    at org.neo4j.cypher.internal.commands.expressions.Property.apply(Property.scala:29) 
    at org.neo4j.cypher.internal.commands.RegularExpression.isMatch(Predicate.scala:259) 
    at org.neo4j.cypher.internal.pipes.FilterPipe$$anonfun$createResults$1.apply(FilterPipe.scala:29) 
    at org.neo4j.cypher.internal.pipes.FilterPipe$$anonfun$createResults$1.apply(FilterPipe.scala:29) 
    at scala.collection.Iterator$$anon$22.hasNext(Iterator.scala:390) 
    at scala.collection.Iterator$$anon$19.hasNext(Iterator.scala:334) 
    at scala.collection.Iterator$class.isEmpty(Iterator.scala:272) 
    at scala.collection.Iterator$$anon$19.isEmpty(Iterator.scala:333) 
    at org.neo4j.cypher.internal.pipes.SlicePipe.createResults(SlicePipe.scala:32) 
    at org.neo4j.cypher.internal.pipes.ColumnFilterPipe.createResults(ColumnFilterPipe.scala:37) 
    at org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl$$anonfun$6.apply(ExecutionPlanImpl.scala:127) 
    at org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl$$anonfun$6.apply(ExecutionPlanImpl.scala:125) 
    at org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl.execute(ExecutionPlanImpl.scala:33) 
    at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:59) 
    at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:63) 
    at org.neo4j.cypher.javacompat.ExecutionEngine.execute(ExecutionEngine.java:79) 
    at org.springframework.data.neo4j.support.query.CypherQueryEngine.parseAndExecuteQuery(CypherQueryEngine.java:61) 
    ... 21 more 
Caused by: org.neo4j.graphdb.NotFoundException: 'firstName' property not found for NodeImpl#0. 
    at org.neo4j.kernel.impl.core.Primitive.newPropertyNotFoundException(Primitive.java:184) 
    at org.neo4j.kernel.impl.core.Primitive.getProperty(Primitive.java:179) 
    at org.neo4j.kernel.impl.core.NodeImpl.getProperty(NodeImpl.java:52) 
    at org.neo4j.kernel.impl.core.NodeProxy.getProperty(NodeProxy.java:155) 
    at org.neo4j.cypher.internal.commands.expressions.Property.apply(Property.scala:33) 
    ... 38 more 

Donc, la chose la plus importante de cette exception est la ligne suivante - The property 'firstName' does not exist on Node[0] .. Mais comment peut-il être? Il n'y a que Civilian nœuds dans le graphique, et ils ont tous la propriété firstName. Se peut-il que le framework neo4j ajoute d'autres nœuds cachés à mon graphique dont je ne suis pas au courant? Parce que quand je change ma requête en ceci:

start n=node(*) where has(n.firstName) AND n.firstName=~{0} return n 

Tout fonctionne très bien ...

Quel est le problème?

Merci!

Answer 1

neo4j vient automatiquement avec 1 nœud lorsque vous créez une nouvelle instance, et c'est le nœud de référence. Vous devriez supprimer ceci.

graphDatabaseService.getNodeById(0).delete()