Issues with JanusgraphManager in latest master code

[AG]

Hi All,

I have downloaded the latest master code and built it using the instruction in janusgraph-dist. The code seems to be working fine in JanusPlanFactoryMode. I had trouble making it work in ConfiguredPlanFactory mode. I made the required changes as per the instruction in the document. But, due to some reason, the JanusGraphManager class is not getting imported.

Here is how my gremlin-server.yaml looks :

host: 0.0.0.0

port: 8182

scriptEvaluationTimeout: 30000

channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer

graphManager: org.JanusGraph.graphdb.management.JanusGraphManager

graphs: {

  graph: conf/gremlin-server/janusgraph-cassandra-es-server.properties,

  ConfigurationManagementGraph: conf/JanusGraph-configurationmanagement.properties

}

scriptEngines: {

  gremlin-groovy: {

    plugins: { org.janusgraph.graphdb.tinkerpop.plugin.JanusGraphGremlinPlugin: {},

               org.apache.tinkerpop.gremlin.server.jsr223.GremlinServerGremlinPlugin: {},

               org.apache.tinkerpop.gremlin.tinkergraph.jsr223.TinkerGraphGremlinPlugin: {},

               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]}},

    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

When I ran gremlin-server I got the following error message :

264  [main] INFO  org.apache.tinkerpop.gremlin.server.util.MetricManager  - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics

356  [main] ERROR org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Could not find GraphManager implementation defined by the 'graphManager' setting as: org.JanusGraph.graphdb.management.JanusGraphManager

Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: org.JanusGraph.graphdb.management.JanusGraphManager

at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:85)

at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:111)

at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:325)

Caused by: java.lang.ClassNotFoundException: org.JanusGraph.graphdb.management.JanusGraphManager

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:264)

at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:78)

... 2 more

396  [gremlin-server-shutdown] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the standard OpProcessor.

399  [gremlin-server-shutdown] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the session OpProcessor.

679  [gremlin-server-shutdown] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the traversal OpProcessor.

680  [gremlin-server-shutdown] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Shutting down OpProcessor[]

680  [gremlin-server-shutdown] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Shutting down OpProcessor[session]

682  [gremlin-server-shutdown] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Shutting down OpProcessor[traversal]

682  [gremlin-server-shutdown] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Shutting down thread pools.

Exception in thread "gremlin-server-shutdown" java.lang.NullPointerException

at org.apache.tinkerpop.gremlin.server.GremlinServer.stop(GremlinServer.java:235)

at org.apache.tinkerpop.gremlin.server.GremlinServer.lambda$new$0(GremlinServer.java:92)

at java.lang.Thread.run(Thread.java:745)

 

When I compared the latest sample gremlin-server.yaml with the one in Janusgraph version 0.2.0 I observed that the following lines have been removed:

plugins:

  - janusgraph.imports

So, I was wondering if this is the reason the class was not imported. Please let me know what am I missing here.

Thanks,

Anand

[Jason Plurad]

The package name should not be camel case. This is the correct value:

org.janusgraph.graphdb.management.JanusGraphManager

See the example under conf/gremlin-server/gremlin-server-configuration.yaml

[Jason Plurad]

I opened up this issue to update the docs https://github.com/JanusGraph/janusgraph/issues/825