ArangoDB : MissingPropertyException:没有这样的属性: Script1类的图形

Question

我试图使用ArangoDB作为Tinkerpop的community supported provider，这样我就可以在Python项目中使用Gremlin了，但是我得到了以下错误：

[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

我遵循Wiki定义了properties和yaml配置文件。

这是我的properties配置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

这是我的yaml配置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}

然后，我使用ArangoDB docker image (版本3.6.3)并运行：

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

然后我运行Gremlin服务器(版本3.4.6)并运行：

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

之后，终端返回上述错误No such property: graph for class: Script1

Answer 1

问题

该问题与配置有关。

配置文件conf/gremlin-server-arangodb.yaml提到了属性文件定义的图的键/值对列表：

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

然后在scriptEngines.gremlin-groovy.plugins中引用：

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

它指定了一个名称为g的图。

(在脚本文件scripts/empty-sample.groovy中)：

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

没有定义全局graph，它实际上在yaml文件中称为modern。

分辨率

因此，对gremlin-server-arangodb.yaml文件进行了微小的更改。此外，还更改了conf/modern-arangodb.properties图形名称以进行匹配。

更新的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

更新的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}