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POError while retrieving neo4j node data through java
 

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  1. POError while retrieving neo4j node data through java
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    <p>I have loaded about 60k nodes into neo4j through talend. I want to get access to these nodes through java. Java code is only able to fetch a single node which comes with neo4j itself i.e. 0th node. </p> <p>My Java code is :</p> <pre><code>package com.Neo4J; import java.io.File; import java.io.IOException; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import javax.naming.spi.DirStateFactory.Result; import org.neo4j.cypher.javacompat.ExecutionEngine; import org.neo4j.cypher.javacompat.ExecutionResult; import org.neo4j.graphdb.GraphDatabaseService; import org.neo4j.graphdb.Node; import org.neo4j.graphdb.Transaction; import org.neo4j.graphdb.factory.GraphDatabaseFactory; import org.neo4j.helpers.collection.IteratorUtil; import org.neo4j.kernel.impl.util.FileUtils; import org.neo4j.tooling.GlobalGraphOperations; public class CaseNeo4J { private static final String DB_PATH = "data/graph.db"; GraphDatabaseService graphDataService; String nodeResult, resultString, columnsString; String rows = ""; public static void main(String args[]) { CaseNeo4J neoobj = new CaseNeo4J(); neoobj.connect(); } void connect() { graphDataService = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH); Transaction transaction = graphDataService.beginTx(); try { ExecutionEngine engine = new ExecutionEngine(graphDataService); ExecutionResult result = engine.execute("START n = node(0) return n"); System.out.println(result.dumpToString()); } finally { transaction.finish(); } } } </code></pre> <p>As you can see in CQL I am trying to retireve node(0) which is giving me correct result as </p> <pre><code>+-----------+ | n | +-----------+ | Node[0]{} | +-----------+ 1 row </code></pre> <p>But as soon as I give query like <strong>START n = node(1) return n</strong> it throws errors as-</p> <pre><code>Exception in thread "main" org.neo4j.cypher.EntityNotFoundException: Node 1 not found at org.neo4j.cypher.internal.spi.gdsimpl.GDSBackedQueryContext$$anon$1.getById(GDSBackedQueryC ontext.scala:80) at org.neo4j.cypher.internal.spi.gdsimpl.GDSBackedQueryContext$$anon$1.getById(GDSBackedQueryC ontext.scala:48) at org.neo4j.cypher.internal.executionplan.builders.NodeByIdBuilder$$anonfun$org$neo4j$cypher$ internal$executionplan$builders$NodeByIdBuilder$$f$1$1.apply(NodeByIdBuilder.scala:41) at org.neo4j.cypher.internal.executionplan.builders.NodeByIdBuilder$$anonfun$org$neo4j$cypher$ internal$executionplan$builders$NodeByIdBuilder$$f$1$1.apply(NodeByIdBuilder.scala:41) at org.neo4j.cypher.internal.executionplan.builders.GetGraphElements$.org$neo4j$cypher$interna l$executionplan$builders$GetGraphElements$$castElement$1(GetGraphElements.scala:30) at org.neo4j.cypher.internal.executionplan.builders.GetGraphElements$$anonfun$getElements$3.ap ply(GetGraphElements.scala:40) at scala.collection.Iterator$$anon$11.next(Iterator.scala:328) at scala.collection.Iterator$$anon$11.next(Iterator.scala:328) at scala.collection.Iterator$$anon$13.next(Iterator.scala:372) at org.neo4j.cypher.internal.ClosingIterator$$anonfun$next$1.apply(ClosingIterator.scala:44) at org.neo4j.cypher.internal.ClosingIterator.failIfThrows(ClosingIterator.scala:86) at org.neo4j.cypher.internal.ClosingIterator.next(ClosingIterator.scala:43) at scala.collection.Iterator$class.foreach(Iterator.scala:727) at org.neo4j.cypher.internal.ClosingIterator.foreach(ClosingIterator.scala:31) at scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:48) at scala.collection.mutable.ListBuffer.$plus$plus$eq(ListBuffer.scala:178) at scala.collection.mutable.ListBuffer.$plus$plus$eq(ListBuffer.scala:45) at scala.collection.TraversableOnce$class.to(TraversableOnce.scala:259) at org.neo4j.cypher.internal.ClosingIterator.to(ClosingIterator.scala:31) at scala.collection.TraversableOnce$class.toList(TraversableOnce.scala:243) at org.neo4j.cypher.internal.ClosingIterator.toList(ClosingIterator.scala:31) at org.neo4j.cypher.PipeExecutionResult.eagerResult(PipeExecutionResult.scala:100) at org.neo4j.cypher.PipeExecutionResult.dumpToString(PipeExecutionResult.scala:103) at org.neo4j.cypher.PipeExecutionResult.dumpToString$lzycompute(PipeExecutionResult.scala:143) at org.neo4j.cypher.PipeExecutionResult.dumpToString(PipeExecutionResult.scala:140) at org.neo4j.cypher.javacompat.ExecutionResult.dumpToString(ExecutionResult.java:102) at com.Neo4J.CaseNeo4J.connect(CaseNeo4J.java:45) at com.Neo4J.CaseNeo4J.main(CaseNeo4J.java:32) </code></pre> <p>But if I ran <strong>START n = node(1) return n</strong> this query in web UI of neo4j shell it gives me correct result.</p> <p>Is there any idea on this? I will really appreciate if I get some solution here. Thanks!</p>
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    1. This table or related slice is empty.
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    1. USSaurabh Deshpande
    1. USSaurabh Deshpande
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    1. This table or related slice is empty.
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      1. POError while retrieving neo4j node data through java
      1. USSaurabh Deshpande
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