CODEWITHSUNDEEP
javaneo4j
Toni Hermoso Pulido
Toni Hermoso Pulido

Reputation: 493

Neo4j index does does not work using Java API

I'm writing an unmanaged extension and I'm having problem accessing indexes with JAVA API.

The code:

package org.neo4j.parent.parentextension;

import org.codehaus.jackson.map.ObjectMapper;
import org.neo4j.cypher.javacompat.ExecutionEngine;
import org.neo4j.cypher.javacompat.ExecutionResult;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.index.Index;
import org.neo4j.graphdb.index.IndexManager;
import org.neo4j.graphdb.Node;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

@Path("/parent")
public class ParentDistance {

@GET
@Path("/helloworld")
public String helloWorld() {
    return "Hello World!";
}

@GET
@Path("/common/{acc1}/{acc2}")
public String getCommon(@PathParam("acc1") String acc1, @PathParam("acc2") String acc2, @Context GraphDatabaseService db) throws IOException {

    return db.index().nodeIndexNames().toString();

}



}

helloworld call does work and also other methods that execute a Cypher query. But, as soon as any IndexManager or index is called in any method, anything below stops working. Any hint what to look for?

Thanks!

Upvotes: 1

Views: 76

Answers (1)

Michael Hunger
Michael Hunger

Reputation: 41706

What do you mean by "stops working".

Any exceptions in the logs?

With Neo4j 2.0 you have to do wrap read operations within transactions.

Like this:

@GET
@Path("/common/{acc1}/{acc2}")
public String getCommon(@PathParam("acc1") String acc1, @PathParam("acc2") String acc2, @Context GraphDatabaseService db) throws IOException {
    try (Transaction tx = db.beginTx()) {
       String result = db.index().nodeIndexNames().toString();
       tx.success();
    }
}

Upvotes: 1

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