Answered there.
On Wed, Aug 6, 2014 at 11:22 AM, Rubin <[email protected]> wrote: > I posted this question on stack overflow too: > > > http://stackoverflow.com/questions/25141511/neo4j-cypher-results-as-json-getting-jsonmappingexception-when-using-jsonhelper > > > Regards, > > On 05-08-14 15:31, Rubin wrote: > > Hi Neo4j, > > > > Me and my team are working on neo4vertx, a module that makes it possible > > to talk to a Neo4j database using Vert.x. > > > > We are implementing a feature called "query" which allows a Vert.x user > > to send a Cypher query as an eventbus message and get a JSON resultset > > back. > > > > However, we seem to run into an unexpected problem when serializing to > > JSON using JsonHelper.createJsonFrom() with certain queries. > > > > A quick example (database has stuff in it of course): > > > > // Fails with JsonMappingException (see below): > > "MATCH (n) RETURN n" > > > > //Succeeds: > > "MATCH (n) RETURN n.something" > > > > //Rest of code: > > engine = new ExecutionEngine(graphDatabaseService); > > ExecutionResult result; > > result = engine.execute(query); > > > > Object object = result.iterator(); > > String foo = JsonHelper.createJsonFrom(object); > > System.out.println("DEBUG (foo): " + foo); > > > > > > Does this look familiar to anyone? We essentially want to be able to > > send any kind of query and either return an empty json string or a json > > representation not unlike the result.json that you can retrieve from the > > web interface of neo4j! > > > > > > The Exception: > > testQuery(org.openpcf.neo4vertx.neo4j.Neo4jGraphTest) Time elapsed: > > 2.362 sec <<< ERROR! > > org.neo4j.server.rest.domain.JsonBuildRuntimeException: > > org.codehaus.jackson.map.JsonMappingException: No serializer found for > > class > > org.neo4j.kernel.InternalAbstractGraphDatabase$DependencyResolverImpl > > and no properties discovered to create BeanSerializer (to avoid > > exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) > > (through reference chain: > > > scala.collection.convert.MapWrapper["content"]->org.neo4j.kernel.impl.core.NodeProxy["graphDatabase"]->org.neo4j.test.["dependencyResolver"]) > > at > > > org.codehaus.jackson.map.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:52) > > at > > > org.codehaus.jackson.map.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:25) > > at > > > org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446) > > at > > > org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150) > > at > > > org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112) > > at > > > org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446) > > at > > > org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150) > > at > > > org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112) > > at > > > org.codehaus.jackson.map.ser.std.MapSerializer.serializeFields(MapSerializer.java:262) > > at > > > org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:186) > > at > > > org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:23) > > at > > > org.codehaus.jackson.map.ser.std.StdContainerSerializers$IteratorSerializer.serializeContents(StdContainerSerializers.java:234) > > at > > > org.codehaus.jackson.map.ser.std.StdContainerSerializers$IteratorSerializer.serializeContents(StdContainerSerializers.java:195) > > at > > > org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86) > > at > > > org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610) > > at > > > org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256) > > at > org.codehaus.jackson.map.ObjectMapper.writeValue(ObjectMapper.java:1613) > > at > > > org.neo4j.server.rest.domain.JsonHelper.createJsonFrom(JsonHelper.java:108) > > at > org.openpcf.neo4vertx.neo4j.Neo4jGraph.query(Neo4jGraph.java:132) > > at > > > org.openpcf.neo4vertx.neo4j.Neo4jGraphTest.testQuery(Neo4jGraphTest.java:47) > > > > -- > You received this message because you are subscribed to the Google Groups > "Neo4j" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
