Tinkerpop Gremlin server MissingPropertyException for SparkGraphComputer in remote mode - groovy

Question

I am new to tinkerpop, gremlin and groovy.
I have configured a Tinkerpop Gremlin Server and Console [v3.2.3] with verified integration with HDFS and Spark.
Next I try to execute below code using gremlin console in local mode, everything works fine, a spark job is submitted and successfully processed.
:load data/grateful-dead-janusgraph-schema.groovy
graph = JanusGraphFactory.open('conf/connection.properties')
defineGratefulDeadSchema(graph)
graph.close()
hdfs.copyFromLocal('data/grateful-dead.kryo','data/grateful-dead.kryo')
graph = GraphFactory.open('conf/hadoop-graph/hadoop-load.properties')
blvp = BulkLoaderVertexProgram.build().writeGraph('conf/connection.properties').create(graph)
graph.compute(SparkGraphComputer).program(blvp).submit().get()
Next I connect gremlin console to gremlin server as remote using below command.
:remote connect tinkerpop.server conf/remote.yaml
After this I execute above code prefixing statements with ":> ". As soon as I submit last line which is submitting processing to SparkGraphComputer, I get below exception at the server -
[WARN] AbstractEvalOpProcessor - Exception processing a script on request [RequestMessage{, requestId=097785d6-7114-44fb-acbc-1b116dfdaac2, op='eval', processor='', args={gremlin=graph.compute(SparkGraphComputer).program(blvp).submit().get(), bindings={}, batchSize=64}}].
groovy.lang.MissingPropertyException: No such property: SparkGraphComputer for class: Script4
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:53)
at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:52)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:307)
at Script4.run(Script4.groovy:1)
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:619)
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:448)
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233)
at org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines.eval(ScriptEngines.java:119)
at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$2(GremlinExecutor.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
I am unable to understand what does MissingPropertyException means in groovy, is it similar to NoClassDefFound in java?
I believe some configuration is missing at the server end, can someone help me out?

Answer 1

Well there's two ways to go about this. You can simply import SparkGraphComputer in the script that you're sending or you can add it to the scriptEngines configuration for your gremlin server. Something like
scriptEngines: {
gremlin-groovy: {
imports: [your.full.path.to.TheClass],
staticImports: [your.full.path.to.TheClass.StaticVar]
}
}