CODEWITHSUNDEEP
neo4jgremlingremlin-server
Kaushik Nath
Kaushik Nath

Reputation: 116

Gremlin server with neo4j

I am trying to use gremlin-server by tinkerpop. I am not able to launch a gremlin server with neo4j.

The documentation says.

Note that TinkerPop does not include Neo4j dependencies in its distributions. To use this file, please ensure that Neo4j dependencies are installed into Gremlin Server's path with gremlin-server.sh -i org.apache.tinkerpop neo4j-gremlin 3.y.z

I have already installed the neo4j-gremlin using :install, as -i is said to be deprecated.

Still, I am getting the following error, on the following command 

.\bin\gremlin-server.bat .\conf\gremlin-server-neo4j.yaml

ERROR

    [WARN] DefaultGraphManager - Graph [graph] configured at [conf/neo4j-empty.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: GraphFactory could not find [org.apache.tinkerpop.gremlin.neo4j.structure.Neo4jGraph] - Ensure that the jar is in the classpath
java.lang.RuntimeException: GraphFactory could not find [org.apache.tinkerpop.gremlin.neo4j.structure.Neo4jGraph] - Ensure that the jar is in the classpath
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:63)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:104)
    at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.lambda$new$0(DefaultGraphManager.java:57)
    at java.util.LinkedHashMap$LinkedEntrySet.forEach(Unknown Source)
    at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.<init>(DefaultGraphManager.java:55)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:105)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:84)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:111)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:355)
[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
Exception in thread "main" java.lang.IllegalStateException: java.lang.ClassNotFoundException: org.apache.tinkerpop.gremlin.neo4j.jsr223.Neo4jGremlinPlugin
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.initializeGremlinScriptEngineManager(GremlinExecutor.java:444)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.<init>(GremlinExecutor.java:103)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.<init>(GremlinExecutor.java:72)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor$Builder.create(GremlinExecutor.java:586)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:157)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:84)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:111)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:355)
Caused by: java.lang.ClassNotFoundException: org.apache.tinkerpop.gremlin.neo4j.jsr223.Neo4jGremlinPlugin
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.initializeGremlinScriptEngineManager(GremlinExecutor.java:407)
    ... 7 more

Upvotes: 2

Views: 1676

Answers (2)

Wolfgang Fahl
Wolfgang Fahl

Reputation: 15604

As a committer of the gremlin-python-tutorial github project my answer would be to look at the relevant lines of the

https://github.com/WolfgangFahl/gremlin-python-tutorial/blob/master/run

script.

  version=3.4.3
  plugin=neo4j-gremlin
  gsd=apache-tinkerpop-gremlin-server-${version}
  if [ ! -d $gsd/ext/$plugin ]
  then
    color_msg $blue "installing plugin $plugin"
    $gsd/bin/gremlin-server.sh install org.apache.tinkerpop $plugin $version
  else
    color_msg $green "$plugin plugin already installed"
  fi
  color_msg $blue "starting neo4j gremlin-server ..."
  conf=$(realpath $gsd/conf/gremlin-server-neo4j.yaml)
  $gsd/bin/gremlin-server.sh $conf

In the Neo4J section of http://wiki.bitplan.com/index.php/Gremlin_python#Connecting_to_Gremlin_enabled_graph_databases you'll find the explanation

Please not the check whether the ext directory contains the installation (see Stephen Mallette's question in a comment above).

Upvotes: 0

Robert Dale
Robert Dale

Reputation: 51

:install is the console command.

install is the server command. -i also still works.

Upvotes: 2

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