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dockergremlinarangodbgremlin-server

Tinkerpop and ArangoDB : MissingPropertyException: No such property: graph for class: Script1

I am trying to use ArangoDB as a community supported provider for Tinkerpop so that I can use Gremlin in a Python project but I get the following error:

[ERROR] DefaultGremlinScriptEngineManager - Could not create GremlinScriptEngine for gremlin-groovy
java.lang.IllegalStateException: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1

I have followed the Wiki to define the properties and yaml configuration files.

Here is my properties configuration conf/modern-arangodb.properties:

gremlin.graph = com.arangodb.tinkerpop.gremlin.structure.ArangoDBGraph
gremlin.arangodb.conf.graph.db = tinkerpop
gremlin.arangodb.conf.graph.name = modern
gremlin.arangodb.conf.graph.vertex = Place
gremlin.arangodb.conf.graph.edge = Transition
gremlin.arangodb.conf.arangodb.hosts = 127.0.0.1:8529
gremlin.arangodb.conf.arangodb.user = root
gremlin.arangodb.conf.arangodb.password = openSesame

Here is my yaml configuration conf/gremlin-server-arangodb.yaml:

host: localhost
port: 8182
scriptEvaluationTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphs: {
  modern: conf/modern-arangodb.properties}
scriptEngines: {
  gremlin-groovy: {
    plugins: { org.apache.tinkerpop.gremlin.server.jsr223.GremlinServerGremlinPlugin: {},
               com.arangodb.tinkerpop.gremlin.jsr223.ArangoDBGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.jsr223.ImportGremlinPlugin: {classImports: [java.lang.Math], methodImports: [java.lang.Math#*]},
               org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {files: [scripts/empty-sample.groovy]}}}}
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0] }}             # application/vnd.gremlin-v3.0+gryo
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { serializeResultToString: true }}                                                                       # application/vnd.gremlin-v3.0+gryo-stringd
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0] }}         # application/json
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV2d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV2d0] }}         # application/vnd.gremlin-v2.0+json
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1 }                                                                                                            # application/vnd.graphbinary-v1.0
processors:
  - { className: org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor, config: { sessionTimeout: 28800000 }}
  - { className: org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor, config: { cacheExpirationTime: 600000, cacheMaxSize: 1000 }}
metrics: {
  consoleReporter: {enabled: true, interval: 180000},
  csvReporter: {enabled: true, interval: 180000, fileName: /tmp/gremlin-server-metrics.csv},
  jmxReporter: {enabled: true},
  slf4jReporter: {enabled: true, interval: 180000}}
strictTransactionManagement: false
idleConnectionTimeout: 0
keepAliveInterval: 0
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536
maxAccumulationBufferComponents: 1024
resultIterationBatchSize: 64
writeBufferLowWaterMark: 32768
writeBufferHighWaterMark: 65536
ssl: {
  enabled: false}

I then use the ArangoDB docker image (Version 3.6.3) and run:

docker run -p 8529:8529 -e ARANGO_ROOT_PASSWORD=openSesame arangodb/arangodb:3.6.3

Then I run the Gremlin Server (Version 3.4.6) and run:

GREMLIN_YAML=conf/gremlin-server-arangodb.yaml bin/gremlin-server.sh console

After which the terminal returns the aforementioned error No such property: graph for class: Script1

Solution

  • Issue

    The issue was related to the configuration.

    the configuration file conf/gremlin-server-arangodb.yaml mentions a key/value pair list of graph defined by properties files:

    graphs: {
  modern: conf/modern-arangodb.properties}

    Then in the scriptEngines.gremlin-groovy.plugins it references:

    ScriptFileGremlinPlugin: {files: [scripts/empty-sample.groovy]}

    Which specifies a graph with the name g.

    (In Script file scripts/empty-sample.groovy):

    globals << [g : graph.traversal().withStrategies(ReferenceElementStrategy.instance())]

    The global graph is not defined, which in fact is called modern in the yaml file.

    Resolution

    Therefore a minor change in the gremlin-server-arangodb.yaml file was made. In addition, the conf/modern-arangodb.properties graph name was changed to match.

    Updated conf/modern-arangodb.properties:

    gremlin.graph = com.arangodb.tinkerpop.gremlin.structure.ArangoDBGraph
gremlin.arangodb.conf.graph.db = tinkerpop
gremlin.arangodb.conf.graph.name = graph
gremlin.arangodb.conf.graph.vertex = Place
gremlin.arangodb.conf.graph.edge = Transition
gremlin.arangodb.conf.arangodb.hosts = 127.0.0.1:8529
gremlin.arangodb.conf.arangodb.user = root
gremlin.arangodb.conf.arangodb.password = openSesame

    Updated conf/gremlin-server-arangodb.yaml:

    host: localhost
port: 8182
scriptEvaluationTimeout: 600000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphs: {
  graph: conf/modern-arangodb.properties}
scriptEngines: {
  gremlin-groovy: {
    plugins: { org.apache.tinkerpop.gremlin.server.jsr223.GremlinServerGremlinPlugin: {},
               com.arangodb.tinkerpop.gremlin.jsr223.ArangoDBGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.jsr223.ImportGremlinPlugin: {classImports: [java.lang.Math], methodImports: [java.lang.Math#*]},
               org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {files: [scripts/empty-sample.groovy]}}}}
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0] }}             # application/vnd.gremlin-v3.0+gryo
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { serializeResultToString: true }}                                                                       # application/vnd.gremlin-v3.0+gryo-stringd
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0] }}         # application/json
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV2d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV2d0] }}         # application/vnd.gremlin-v2.0+json
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1 }                                                                                                            # application/vnd.graphbinary-v1.0
processors:
  - { className: org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor, config: { sessionTimeout: 28800000 }}
  - { className: org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor, config: { cacheExpirationTime: 600000, cacheMaxSize: 1000 }}
metrics: {
  consoleReporter: {enabled: true, interval: 180000},
  csvReporter: {enabled: true, interval: 180000, fileName: /tmp/gremlin-server-metrics.csv},
  jmxReporter: {enabled: true},
  slf4jReporter: {enabled: true, interval: 180000}}
strictTransactionManagement: false
idleConnectionTimeout: 0
keepAliveInterval: 0
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536
maxAccumulationBufferComponents: 1024
resultIterationBatchSize: 64
writeBufferLowWaterMark: 32768
writeBufferHighWaterMark: 65536
ssl: {
  enabled: false}