GMongo instance undefined from gremlin shell in neo4j

Question

I am trying to load the data from mongodb database from the Gremlin shell in neo4j in order to create a graph databse from it. The detail is explained in gremlin-mongodb. To get started, I downloaded the GMongo jar file fom GMongo and ran the following codes in Gremlin shell in Neo4j web admin console

gremlin> import com.gmongo.GMongo
gremlin> mongo = new GMongo()

The import command works and imports the packages but the second line failed with message being undefined. I also tried to import the following packages but that did not work either.

import com.mongodb.BasicDBObject
import com.mongodb.DBObject

Any idea what the problem is?

Also, did you download the dependencies for GMongo as well? http://mvnrepository.com/artifact/com.gmongo/gmongo/1.1 — tim_yates, Mar 19 '13 at 15:31
The failure is an "undefined" message in Gremlin. No I did not add the dependencies, does it mean I have to copy the POM file somewhere? I am not a java person , could you please comment. — user1848018, Mar 19 '13 at 15:57
Note that you need both the GMongo jar AND the java mongo driver it depends on: http://mvnrepository.com/artifact/org.mongodb/mongo-java-driver/2.9.0 — stephen mallette, Mar 19 '13 at 16:14

score 2 · Accepted Answer · edited May 23 '17 at 11:50

2

Just wanted to highlight the answer that stephen mallette provided for this question and also many thanks to tim_yates and most of Marko Rodrigez. we need to copy both the GMongo jar file from Gmongo as well as Mongo java driver and put them under lib directory. Thanks again Stephen.

edited May 23 '17 at 11:50

Community

1
1

answered Mar 19 '13 at 17:24

user1848018

1,086
1
14
33

Note that, as of Gremlin 2.4.0, in addition to manually copying jars into the Gremlin path (which can lead to troubles like this one), you can now use Grape to handle dependencies right from the repl. In essence you can simply do: `gremlin> Grape.grab(group:'com.gmongo',module:'gmongo',version:'1.2')`. Read more about this feature here: https://github.com/tinkerpop/gremlin/wiki/Using-Gremlin-through-Groovy#use-of-external-jars – stephen mallette Jun 20 '13 at 22:34

score 0 · Answer 2 · answered Mar 19 '13 at 15:42

0

Make sure you have GMongo in the lib directory of Gremlin.

answered Mar 19 '13 at 15:42

Marko A. Rodriguez

1,702
12
13

I did, the fact that I can import com.gmongo.GMongo confirms that the jar file is in the right place, I think – user1848018 Mar 19 '13 at 15:54

score 0 · Answer 3 · answered Mar 19 '13 at 17:13

0

Try putting your script in a file and then executing the entire file. For some reason in the shell the context gets lost. If you do an import and then execute another line, the shell won't remember the import.

This is what I end up doing - creating a file and then doing something like this:

./gremlin.sh -e my-script.groovy

Try that.

answered Mar 19 '13 at 17:13

ryan1234

7,237
6
25
36

Next time, I try that. It works now, I had missed to add teh java driver. Thanks – user1848018 Mar 19 '13 at 17:26

GMongo instance undefined from gremlin shell in neo4j

3 Answers3