invalid contact point cass_cluster:7000 (unknown host cass_cluster)

[raphael10-collab]

In the 3 cloud VPS I installed JanusGraph and Cassandra via plain Docker Container

root@vmi1231861:~# docker ps -a
CONTAINER ID   IMAGE       COMMAND                  CREATED        STATUS       PORTS                                         NAMES
1f48f420d7c2   cassandra   "docker-entrypoint.s…"   15 hours ago   Up 2 hours   7000-7001/tcp, 7199/tcp, 9042/tcp, 9160/tcp   cass_cluster

Following the indications found here: https://cassandra.apache.org/doc/latest/cassandra/configuration/cass_yaml_file.html#seed_provider
I specified, in the second and third VPS, the IP Addresses of the other two machines

When I run the janusgraph docker container without specifying any storage backend, thus using the default one, it seems working fine:

root@vmi1231861:~# docker run --name janusgraph-default janusgraph/janusgraph:latest
/etc/opt/janusgraph/janusgraph-server.yaml will be used to start JanusGraph Server in foreground
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/logback-classic-1.2.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/slf4j-reload4j-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
08:50:43 WARN  org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine - Script compilation // Copyright 2019 JanusGraph Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// an init script that returns a Map allows explicit setting of global bindings.
def globals = [:]

// defines a sample LifeCycleHook that prints some output to the Gremlin Server console.
// note that the name of the key in the "global" map is unimportant.
globals << [hook : [
        onStartUp: { ctx ->
            ctx.logger.info("Executed once at startup of Gremlin Server.")
        },
        onShutDown: { ctx ->
            ctx.logger.info("Executed once at shutdown of Gremlin Server.")
        }
] as LifeCycleHook]

// define the default TraversalSource to bind queries to - this one will be named "g".
globals << [g : graph.traversal()] took 5992ms
08:50:44 WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.
08:50:44 WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.




root@vmi1231861:~# 
root@vmi1231861:~# docker run --rm --link janusgraph-default:janusgraph -e GREMLIN_REMOTE_HOSTS=janusgraph \
> -it janusgraph/janusgraph:latest ./bin/gremlin.sh
Mar 10, 2023 8:53:27 AM java.util.prefs.FileSystemPreferences$1 run
INFO: Created user preferences directory.

         \,,,/
         (o o)
-----oOOo-(3)-oOOo-----
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/logback-classic-1.2.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/slf4j-reload4j-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
plugin activated: tinkerpop.server
plugin activated: tinkerpop.tinkergraph
08:53:43 WARN  org.apache.hadoop.util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
plugin activated: tinkerpop.hadoop
plugin activated: tinkerpop.spark
plugin activated: tinkerpop.utilities
plugin activated: janusgraph.imports
gremlin> 
gremlin> Graph graph = TinkerGraph.open();
==>tinkergraph[vertices:0 edges:0]
gremlin> 

I tried then to set cass_cluster as the storage backend :

root@vmi1231861:~# docker ps -a
CONTAINER ID   IMAGE       COMMAND                  CREATED        STATUS       PORTS                                         NAMES
1f48f420d7c2   cassandra   "docker-entrypoint.s…"   16 hours ago   Up 2 hours   7000-7001/tcp, 7199/tcp, 9042/tcp, 9160/tcp   cass_cluster


root@vmi1231861:~# nano janusgraph-env.txt 
janusgraph.storage.backend=cql
janusgraph.storage.hostname=cass_cluster
janusgraph.storage.port=7000
janusgraph.cluster.max-partition=32

But I get :

root@vmi1231861:~# docker run --env-file ./janusgraph-env.txt --name janusgraph-default janusgraph/janusgraph:latest
waiting for storage...
waiting for storage...
/etc/opt/janusgraph/janusgraph-server.yaml will be used to start JanusGraph Server in foreground
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/logback-classic-1.2.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/slf4j-reload4j-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
10:14:58 WARN  com.datastax.oss.driver.internal.core.ContactPoints - Ignoring invalid contact point cass_cluster:7000 (unknown host cass_cluster)
10:15:00 WARN  com.datastax.oss.driver.internal.core.control.ControlConnection - [JanusGraph Session] Error connecting to Node(endPoint=/127.0.0.1:9042, hostId=null, hashCode=6c84e183), trying next node (ConnectionInitException: [JanusGraph Session|control|connecting...] Protocol initialization request, step 1 (OPTIONS): failed to send request (io.netty.channel.StacklessClosedChannelException))
10:15:00 WARN  org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager - Graph [graph] configured at [/etc/opt/janusgraph/janusgraph.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:84)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:72)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:106)
    at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.addGraph(DefaultGraphManager.java:63)
    at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
    at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.<init>(DefaultGraphManager.java:58)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:86)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:127)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:90)
    at org.janusgraph.graphdb.server.JanusGraphServer.start(JanusGraphServer.java:85)
    at org.janusgraph.graphdb.server.JanusGraphServer.main(JanusGraphServer.java:53)
Caused by: java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:80)
    ... 14 common frames omitted
Caused by: java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.cql.CQLStoreManager
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:79)
    at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:527)
    at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:491)
    at org.janusgraph.graphdb.configuration.builder.GraphDatabaseConfigurationBuilder.build(GraphDatabaseConfigurationBuilder.java:64)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:176)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:147)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:127)
    ... 19 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:73)
    ... 25 common frames omitted
Caused by: com.datastax.oss.driver.api.core.AllNodesFailedException: Could not reach any contact point, make sure you've provided valid addresses (showing first 1 nodes, use getAllErrors() for more): Node(endPoint=/127.0.0.1:9042, hostId=null, hashCode=6c84e183): [com.datastax.oss.driver.api.core.connection.ConnectionInitException: [JanusGraph Session|control|connecting...] Protocol initialization request, step 1 (OPTIONS): failed to send request (io.netty.channel.StacklessClosedChannelException)]
    at com.datastax.oss.driver.api.core.AllNodesFailedException.copy(AllNodesFailedException.java:141)
    at com.datastax.oss.driver.internal.core.util.concurrent.CompletableFutures.getUninterruptibly(CompletableFutures.java:149)
    at com.datastax.oss.driver.api.core.session.SessionBuilder.build(SessionBuilder.java:835)
    at org.janusgraph.diskstorage.cql.builder.CQLSessionBuilder.build(CQLSessionBuilder.java:81)
    at org.janusgraph.diskstorage.cql.CQLStoreManager.<init>(CQLStoreManager.java:135)
    at org.janusgraph.diskstorage.cql.CQLStoreManager.<init>(CQLStoreManager.java:116)
    ... 30 common frames omitted
    Suppressed: com.datastax.oss.driver.api.core.connection.ConnectionInitException: [JanusGraph Session|control|connecting...] Protocol initialization request, step 1 (OPTIONS): failed to send request (io.netty.channel.StacklessClosedChannelException)
	    at com.datastax.oss.driver.internal.core.channel.ProtocolInitHandler$InitRequest.fail(ProtocolInitHandler.java:356)
	    at com.datastax.oss.driver.internal.core.channel.ChannelHandlerRequest.writeListener(ChannelHandlerRequest.java:87)
	    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:590)
	    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:557)
	    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:492)
	    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:185)
	    at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:95)
	    at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:30)
	    at com.datastax.oss.driver.internal.core.channel.ChannelHandlerRequest.send(ChannelHandlerRequest.java:76)
	    at com.datastax.oss.driver.internal.core.channel.ProtocolInitHandler$InitRequest.send(ProtocolInitHandler.java:193)
	    at com.datastax.oss.driver.internal.core.channel.ProtocolInitHandler.onRealConnect(ProtocolInitHandler.java:124)
	    at com.datastax.oss.driver.internal.core.channel.ConnectInitHandler.lambda$connect$0(ConnectInitHandler.java:57)
	    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:590)
	    at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:583)
	    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:559)
	    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:492)
	    at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:636)
	    at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:629)
	    at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:118)
	    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:321)
	    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:337)
	    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776)
	    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
	    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
	    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
	    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	    at java.lang.Thread.run(Thread.java:750)
	    Suppressed: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /127.0.0.1:9042
	    Caused by: java.net.ConnectException: Connection refused
		    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
		    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:716)
		    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:337)
		    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)
		    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776)
		    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
		    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
		    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
		    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
		    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
		    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
		    at java.lang.Thread.run(Thread.java:750)
    Caused by: io.netty.channel.StacklessClosedChannelException: null
	    at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0()(Unknown Source)
10:15:07 WARN  org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine - Script compilation // Copyright 2019 JanusGraph Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// an init script that returns a Map allows explicit setting of global bindings.
def globals = [:]

// defines a sample LifeCycleHook that prints some output to the Gremlin Server console.
// note that the name of the key in the "global" map is unimportant.
globals << [hook : [
        onStartUp: { ctx ->
            ctx.logger.info("Executed once at startup of Gremlin Server.")
        },
        onShutDown: { ctx ->
            ctx.logger.info("Executed once at shutdown of Gremlin Server.")
        }
] as LifeCycleHook]

// define the default TraversalSource to bind queries to - this one will be named "g".
globals << [g : graph.traversal()] took 5278ms
10:15:07 ERROR org.apache.tinkerpop.gremlin.jsr223.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
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:464)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:647)
    at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:272)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.createGremlinScriptEngine(DefaultGremlinScriptEngineManager.java:450)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.getEngineByName(DefaultGremlinScriptEngineManager.java:219)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.lambda$getEngineByName$0(CachedGremlinScriptEngineManager.java:57)
    at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:57)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:750)
Caused by: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:381)
    at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:460)
    ... 24 common frames omitted
Caused by: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:700)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:379)
    ... 26 common frames omitted
Caused by: groovy.lang.MissingPropertyException: No such property: graph for class: Script1
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:65)
    at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:51)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:309)
    at Script1.run(Script1.groovy:30)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:677)
    ... 27 common frames omitted
10:15:07 WARN  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor - Could not initialize gremlin-groovy GremlinScriptEngine as init script could not be evaluated
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
    at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
    at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1947)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.lambda$new$4(ServerGremlinExecutor.java:153)
    at java.util.LinkedHashMap$LinkedKeySet.forEach(LinkedHashMap.java:559)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:145)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:127)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:90)
    at org.janusgraph.graphdb.server.JanusGraphServer.start(JanusGraphServer.java:85)
    at org.janusgraph.graphdb.server.JanusGraphServer.main(JanusGraphServer.java:53)
Caused by: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.registerLookUpInfo(CachedGremlinScriptEngineManager.java:95)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:58)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:750)
10:15:08 WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.
10:15:08 WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.

Based on the indications here: https://docs.janusgraph.org/configs/example-config/ I should use the IP Address:

but I thought, based on what we saw yesterday: #3654 (reply in thread) that the name of the Cassandra Container should work

Anyway, I tried also with the IP Address:

janusgraph.storage.backend=cql
janusgraph.storage.hostname=127.0.0.1   
janusgraph.storage.port=7000

But I get : Error connecting to Node(endPoint=/127.0.0.1:7000, hostId=null, hashCode=2712615d), :

root@vmi1231861:~# docker run --env-file ./janusgraph-env.txt --name janusgraph-default janusgraph/janusgraph:latest
waiting for storage...
waiting for storage...
/etc/opt/janusgraph/janusgraph-server.yaml will be used to start JanusGraph Server in foreground
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/logback-classic-1.2.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/janusgraph/lib/slf4j-reload4j-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
09:21:24 WARN  com.datastax.oss.driver.internal.core.control.ControlConnection - [JanusGraph Session] Error connecting to Node(endPoint=/127.0.0.1:7000, hostId=null, hashCode=2712615d), trying next node (ConnectionInitException: [JanusGraph Session|control|connecting...] Protocol initialization request, step 1 (OPTIONS): failed to send request (io.netty.channel.StacklessClosedChannelException))
09:21:24 WARN  org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager - Graph [graph] configured at [/etc/opt/janusgraph/janusgraph.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:84)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:72)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:106)
    at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.addGraph(DefaultGraphManager.java:63)
    at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
    at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.<init>(DefaultGraphManager.java:58)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:86)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:127)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:90)
    at org.janusgraph.graphdb.server.JanusGraphServer.start(JanusGraphServer.java:85)
    at org.janusgraph.graphdb.server.JanusGraphServer.main(JanusGraphServer.java:53)
Caused by: java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:80)
    ... 14 common frames omitted
Caused by: java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.cql.CQLStoreManager
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:79)
    at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:527)
    at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:491)
    at org.janusgraph.graphdb.configuration.builder.GraphDatabaseConfigurationBuilder.build(GraphDatabaseConfigurationBuilder.java:64)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:176)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:147)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:127)
    ... 19 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:73)
    ... 25 common frames omitted
Caused by: com.datastax.oss.driver.api.core.AllNodesFailedException: Could not reach any contact point, make sure you've provided valid addresses (showing first 1 nodes, use getAllErrors() for more): Node(endPoint=/127.0.0.1:7000, hostId=null, hashCode=2712615d): [com.datastax.oss.driver.api.core.connection.ConnectionInitException: [JanusGraph Session|control|connecting...] Protocol initialization request, step 1 (OPTIONS): failed to send request (io.netty.channel.StacklessClosedChannelException)]
    at com.datastax.oss.driver.api.core.AllNodesFailedException.copy(AllNodesFailedException.java:141)
    at com.datastax.oss.driver.internal.core.util.concurrent.CompletableFutures.getUninterruptibly(CompletableFutures.java:149)
    at com.datastax.oss.driver.api.core.session.SessionBuilder.build(SessionBuilder.java:835)
    at org.janusgraph.diskstorage.cql.builder.CQLSessionBuilder.build(CQLSessionBuilder.java:81)
    at org.janusgraph.diskstorage.cql.CQLStoreManager.<init>(CQLStoreManager.java:135)
    at org.janusgraph.diskstorage.cql.CQLStoreManager.<init>(CQLStoreManager.java:116)
    ... 30 common frames omitted
    Suppressed: com.datastax.oss.driver.api.core.connection.ConnectionInitException: [JanusGraph Session|control|connecting...] Protocol initialization request, step 1 (OPTIONS): failed to send request (io.netty.channel.StacklessClosedChannelException)
	    at com.datastax.oss.driver.internal.core.channel.ProtocolInitHandler$InitRequest.fail(ProtocolInitHandler.java:356)
	    at com.datastax.oss.driver.internal.core.channel.ChannelHandlerRequest.writeListener(ChannelHandlerRequest.java:87)
	    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:590)
	    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:557)
	    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:492)
	    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:185)
	    at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:95)
	    at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:30)
	    at com.datastax.oss.driver.internal.core.channel.ChannelHandlerRequest.send(ChannelHandlerRequest.java:76)
	    at com.datastax.oss.driver.internal.core.channel.ProtocolInitHandler$InitRequest.send(ProtocolInitHandler.java:193)
	    at com.datastax.oss.driver.internal.core.channel.ProtocolInitHandler.onRealConnect(ProtocolInitHandler.java:124)
	    at com.datastax.oss.driver.internal.core.channel.ConnectInitHandler.lambda$connect$0(ConnectInitHandler.java:57)
	    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:590)
	    at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:583)
	    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:559)
	    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:492)
	    at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:636)
	    at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:629)
	    at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:118)
	    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:321)
	    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:337)
	    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776)
	    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
	    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
	    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
	    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	    at java.lang.Thread.run(Thread.java:750)
	    Suppressed: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /127.0.0.1:7000
	    Caused by: java.net.ConnectException: Connection refused
		    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
		    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:716)
		    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:337)
		    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)
		    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776)
		    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
		    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
		    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
		    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
		    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
		    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
		    at java.lang.Thread.run(Thread.java:750)
    Caused by: io.netty.channel.StacklessClosedChannelException: null
	    at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0()(Unknown Source)
09:21:32 WARN  org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine - Script compilation // Copyright 2019 JanusGraph Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// an init script that returns a Map allows explicit setting of global bindings.
def globals = [:]

// defines a sample LifeCycleHook that prints some output to the Gremlin Server console.
// note that the name of the key in the "global" map is unimportant.
globals << [hook : [
        onStartUp: { ctx ->
            ctx.logger.info("Executed once at startup of Gremlin Server.")
        },
        onShutDown: { ctx ->
            ctx.logger.info("Executed once at shutdown of Gremlin Server.")
        }
] as LifeCycleHook]

// define the default TraversalSource to bind queries to - this one will be named "g".
globals << [g : graph.traversal()] took 6321ms
09:21:32 ERROR org.apache.tinkerpop.gremlin.jsr223.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
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:464)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:647)
    at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:272)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.createGremlinScriptEngine(DefaultGremlinScriptEngineManager.java:450)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.getEngineByName(DefaultGremlinScriptEngineManager.java:219)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.lambda$getEngineByName$0(CachedGremlinScriptEngineManager.java:57)
    at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:57)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:750)
Caused by: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:381)
    at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:460)
    ... 24 common frames omitted
Caused by: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:700)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:379)
    ... 26 common frames omitted
Caused by: groovy.lang.MissingPropertyException: No such property: graph for class: Script1
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:65)
    at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:51)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:309)
    at Script1.run(Script1.groovy:30)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:677)
    ... 27 common frames omitted
09:21:32 WARN  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor - Could not initialize gremlin-groovy GremlinScriptEngine as init script could not be evaluated
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
    at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
    at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1947)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.lambda$new$4(ServerGremlinExecutor.java:153)
    at java.util.LinkedHashMap$LinkedKeySet.forEach(LinkedHashMap.java:559)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:145)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:127)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:90)
    at org.janusgraph.graphdb.server.JanusGraphServer.start(JanusGraphServer.java:85)
    at org.janusgraph.graphdb.server.JanusGraphServer.main(JanusGraphServer.java:53)
Caused by: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.registerLookUpInfo(CachedGremlinScriptEngineManager.java:95)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:58)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:750)
09:21:32 WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.
09:21:33 WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.

So... I'm here again for an help