Gremlin groovy script engine won't start

[linehrr]

starting gremlin server and encountered:

janus-spark-server    | 19:25:32.307 [gremlin-server-exec-1] ERROR o.a.t.g.j.DefaultGremlinScriptEngineManager - Could not create GremlinScriptEngine for gremlin-groovy
janus-spark-server    | groovy.lang.MissingPropertyException: No such property: metaClass for class: java.util.Map
janus-spark-server    |         at groovy.lang.MetaClassImpl.invokeStaticMissingProperty(MetaClassImpl.java:1021) ~[job.jar:0.1.0]
janus-spark-server    |         at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:1866) ~[job.jar:0.1.0]
janus-spark-server    |         at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:1842) ~[job.jar:0.1.0]
janus-spark-server    |         at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:3797) ~[job.jar:0.1.0]
janus-spark-server    |         at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:234) ~[job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.groovy.loaders.ObjectLoader.load(ObjectLoader.groovy:28) ~[job.jar:0.1.0]
janus-spark-server    |         at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:234) ~[job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.groovy.loaders.GremlinLoader.load(GremlinLoader.groovy:27) ~[job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.<init>(GremlinGroovyScriptEngine.java:223) ~[job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngineFactory.getScriptEngine(GremlinGroovyScriptEngineFactory.java:63) ~[job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.createGremlinScriptEngine(DefaultGremlinScriptEngineManager.java:415) ~[job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.getEngineByName(DefaultGremlinScriptEngineManager.java:219) ~[job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.lambda$getEngineByName$0(CachedGremlinScriptEngineManager.java:57) [job.jar:0.1.0]
janus-spark-server    |         at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) ~[na:1.8.0_201]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:57) [job.jar:0.1.0]
janus-spark-server    |         at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:267) ~[job.jar:0.1.0]
janus-spark-server    |         at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_201]
janus-spark-server    |         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_201]
janus-spark-server    |         at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_201]
janus-spark-server    |         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_201]
janus-spark-server    |         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[na:1.8.0_201]
janus-spark-server    |         at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_201]

Looks like it's Java version related, however we are running JRE1.8 so it should be good to support groovy3.

For confirmed bugs, please report:

• Version: 3.4.6
• Storage Backend: cql
• Mixed Index Backend: ES

[Charele]

groovy3?
Janusgraph use Tinkerpop, Tinkerpop use Groovy,
but Tinkerpop(include the newest v3.5.0) use Groovy2, not Groovy3.

So I think you should use groovy2 for compatibility,
It's Tinkerpop's business, not Janusgraph

[porunov]

@linehrr I converted the issue into the discussion as I believe the issue wasn't a bug report.
As @Charele said, TinkerPop is using groovy2 as for now and not groovy3. They tried to use groovy3 but had to rollback due to some issues on groovy3 side which they are waiting to be resolved. You can follow the upgrade ticket here: https://issues.apache.org/jira/projects/TINKERPOP/issues/TINKERPOP-2373