如果maxDepth是3代碼運行正常，如果maxDepth = 4這個代碼掛@調用td.traverse（開始）（〜38行）&然後我得到：在螺紋的Neo4j - heap space錯誤 - TraversalDescription.traverse（節點）;
異常 「主」 的java.lang .OutOfMemoryError：Java堆空間 在java.util.Arrays.copyOf（Arrays.java:2882） 在java.lang.AbstractStringBuilder.expandCapacity（AbstractStringBuilder.java:100） 在java.lang.AbstractStringBuilder.append（AbstractStringBuilder。 java：515） at com.sun.jersey.core.util.ReaderWriter.readFromAsString（ReaderWriter.java:172） at com.sun.jersey。java.lang.StringBuilder.append（StringBuilder.java:189） core.util.ReaderWriter.readFromAsString（讀erWriter.java:157） at com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider.readFromAsString（AbstractMessageReaderWriterProvider.java:114） at com.sun.jersey.core.impl.provider.entity.StringProvider.readFrom（StringProvider。的java：73） 在com.sun.jersey.core.impl.provider.entity.StringProvider.readFrom（StringProvider.java:58） 在com.sun.jersey.api.client.ClientResponse.getEntity（ClientResponse.java： 552） at com.sun.jersey.api.client.ClientResponse.getEntity（ClientResponse.java:505） at org.neo4j.rest.graphdb.RequestResult.extractFrom（RequestResult.java:87） at org.neo4j。 rest.graphdb.ExecutingRestRequest.post（ExecutingRestRequest.java:138） 在org.neo4j.rest.graphdb.ExecutingRestAPI.traverse（ExecutingRestAPI.java:486） at org.neo4j.rest.graphdb.RestAPIFacade.traverse（RestAPIFacade.java:202） at org.neo4j.rest.graphdb.traversal.RestTraversal.traverse（RestTraversal.java:162） at com.tr.cmg。 alloy.dao.psd.RelationalPathSearchDAO.executeRelationalPathSearch（RelationalPathSearchDAO.java:38） 在com.tr.cmg.alloy.dao.psd.RelationalPathSearchDAO.main（RelationalPathSearchDAO.java:115）
package com.tr.cmg.alloy.dao.psd;
import java.util.ArrayList;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.traversal.TraversalDescription;
import org.neo4j.rest.graphdb.index.RestIndex;
import org.neo4j.rest.graphdb.traversal.RestTraversalDescription;
import com.tr.cmg.alloy.aspects.audit.DaoTierAuditAspect;
import com.tr.cmg.alloy.dao.psd.relationship.RelationType;
import com.tr.cmg.alloy.dao.support.neo4j.Neo4jDaoSupport;
import com.tr.cmg.alloy.domain.psd.NodeType;
import com.tr.cmg.alloy.services.psd.rps.RelationalPathSearch;
import com.tr.cmg.alloy.services.psd.rps.RelationalPathSearchResult;
public class RelationalPathSearchDAO extends Neo4jDaoSupport{
public RelationalPathSearchResult executeRelationalPathSearch(
RelationalPathSearch rps) {
RestIndex<Node> personIndex = API.getIndex(NodeType.PERSON.name());
Node start = personIndex.get("KEY", rps.getPerson1PermId()).getSingle();
Node end = personIndex.get("KEY", rps.getPerson2PermId()).getSingle();
Iterable<Node> nodes = null;
Iterable<Relationship> relationships = null;
if (start != null && end != null) {
TraversalDescription td = createTraversalDescription(rps);
nodes = null;
relationships = null;
for (Path position : td.traverse(start)) {
// Log audit record info
DaoTierAuditAspect
.storeSqlStatement("Relational Path Neo4j Query: "
+ rps.getPerson1PermId() + " -> "
+ rps.getPerson2PermId());
DaoTierAuditAspect.storeSqlParameters("");
System.out.println(position);
if (position.endNode().equals(end)) {
nodes = position.nodes();
relationships = position.relationships();
break;
}
}
if(nodes == null) {
ArrayList<Node> x = new ArrayList<Node>();
x.add(start);
x.add(end);
nodes = x;
}
}
return new RelationalPathSearchResult(nodes, relationships);
}
private TraversalDescription createTraversalDescription(RelationalPathSearch rps) {
RestTraversalDescription rtd = (RestTraversalDescription) API.createTraversalDescription();
rtd.maxDepth(4);
return rtd
.depthFirst()
.relationships(RelationType.IsDirector, Direction.BOTH)
.relationships(RelationType.HasGraduatedFrom, Direction.BOTH)
.relationships(RelationType.IsOfficer, Direction.BOTH)
.relationships(RelationType.IsUnknownOfficerDirectorAt, Direction.BOTH)
.relationships(RelationType.IsInsiderAt, Direction.BOTH)
.relationships(RelationType.IsEquityAnalystAt, Direction.BOTH)
.relationships(RelationType.IsMemberOrChairmanOf, Direction.BOTH)
.relationships(RelationType.IsChiefInvestmentOfficerAt, Direction.BOTH)
.relationships(RelationType.IsDirectorOfResearchAt, Direction.BOTH)
.relationships(RelationType.IsPortfolioManagerAt, Direction.BOTH)
.relationships(RelationType.IsTraderAt, Direction.BOTH)
.relationships(RelationType.IsEconomistAt, Direction.BOTH)
.relationships(RelationType.IsSalesProfessionalAt, Direction.BOTH)
.relationships(RelationType.IsStrategistAt, Direction.BOTH)
.relationships(RelationType.IsExecutiveOfficerAt, Direction.BOTH)
.relationships(RelationType.IsShariahSupervisoryAt, Direction.BOTH)
.relationships(RelationType.IsNonExecutiveAt, Direction.BOTH)
.relationships(RelationType.IsVEExecutive, Direction.BOTH)
.relationships(RelationType.IsProvidingResearchOn, Direction.BOTH)
.relationships(RelationType.IsAnalystAt, Direction.BOTH)
.relationships(RelationType.IsReuterMessengerUserAt, Direction.BOTH)
.relationships(RelationType.IsProvidingAssetClassCoverageOn, Direction.BOTH)
.relationships(RelationType.IsSpeakingLanguageOf, Direction.BOTH)
.relationships(RelationType.IsProvidingGeographyCoverageOf, Direction.BOTH)
.relationships(RelationType.IsUnknownSellSideBuySideAt, Direction.BOTH)
.relationships(RelationType.IsUnknownInsiderAt, Direction.BOTH)
.relationships(RelationType.IsUnknownResearchAnalystAt, Direction.BOTH)
.relationships(RelationType.IsUnknownVEExecutiveAt, Direction.BOTH)
.relationships(RelationType.IsUnknownReutersMessengerUserAt, Direction.BOTH)
.relationships(RelationType.IsUnknownStreetEventsUserAt, Direction.BOTH);
}
public static void main(String[] args) {
RelationalPathSearchDAO dao = new RelationalPathSearchDAO();
RelationalPathSearch rps = new RelationalPathSearch();
rps.setPerson1PermId("34414591164");
rps.setPerson2PermId("34414710307");
RelationalPathSearchResult result = dao.executeRelationalPathSearch(rps);
result.toJSON();
}
}
我將Max Memory設置爲-Xmx1024m，我仍然收到錯誤消息。數據庫只有1.6M節點，所以這真的不應該是一個問題.. – user1344581