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java - IllegalStateException : Gremlin 服务器必须配置为使用 JanusGraphManager

问题描述

Set<String> graphNames = JanusGraphFactory.getGraphNames();
for(String name:graphNames) {
    System.out.println(name);
}

上面的代码片段产生以下异常

java.lang.IllegalStateException: Gremlin Server must be configured to use the JanusGraphManager.
    at com.google.common.base.Preconditions.checkState(Preconditions.java:173)
    at org.janusgraph.core.JanusGraphFactory.getGraphNames(JanusGraphFactory.java:175)
    at com.JanusTest.controllers.JanusController.getPersonDetail(JanusController.java:66)

我的属性

gremlin.graph=org.janusgraph.core.JanusGraphFactory
storage.backend=cql
storage.hostname=127.0.0.1
cache.db-cache = true
cache.db-cache-clean-wait = 20
cache.db-cache-time = 180000
cache.db-cache-size = 0.5
index.search.backend=elasticsearch
index.search.hostname=127.0.0.1

gremlin-server.yaml

host: 0.0.0.0
port: 8182
scriptEvaluationTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphManager: org.janusgraph.graphdb.management.JanusGraphManager
graphs: {
  ConfigurationManagementGraph: conf/my.properties,
}
plugins:
  - janusgraph.imports
scriptEngines: {
  gremlin-groovy: {
    imports: [java.lang.Math],
    staticImports: [java.lang.Math.PI],
    scripts: [scripts/empty-sample.groovy]}}
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0, config: {ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { serializeResultToString: true }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
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},
  gangliaReporter: {enabled: false, interval: 180000, addressingMode: MULTICAST},
  graphiteReporter: {enabled: false, interval: 180000}}
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536

maxAccumulationBufferComponents: 1024
resultIterationBatchSize: 64
writeBufferLowWaterMark: 32768
writeBufferHighWaterMark: 65536

标签： javagraph-databasesgremlinjanusgraphgremlin-server

解决方案

这个答案类似于这个其他问题。

需要将调用JanusGraphFactory.getGraphNames()发送到远程服务器。如果您在 Gremlin 控制台中工作，请先建立远程会话连接，然后设置远程控制台模式。

gremlin> :remote connect tinkerpop.server conf/remote.yaml session
==>Configured localhost/127.0.0.1:8182

gremlin> :remote console
==>All scripts will now be sent to Gremlin Server - [localhost:8182]-[5206cdde-b231-41fa-9e6c-69feac0fe2b2] - type ':remote console' to return to local mode

然后如 JanusGraph 文档“列出图形”中所述：

ConfiguredGraphFactory.getGraphNames()将返回一组图名称，您已使用 ConfigurationManagementGraph API 为其创建了配置。

JanusGraphFactory.getGraphNames()另一方面，返回一组您已为其实例化的图形名称，并且引用存储在 JanusGraphManager 中。

如果您没有使用 Gremlin 控制台，那么您应该使用远程客户端，例如 TinkerPop gremlin-driver(Java)，将您的请求发送到 Gremlin 服务器。

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