Janusgraph : can't open graph with cql backend

Question

I want to use cql as storage.backend for some test. I run cassandra service locally.

λ cqlsh

WARNING: console codepage must be set to cp65001 to support utf-8 encoding on Windows platforms.
If you experience encoding problems, change your console codepage with 'chcp 65001' before starting cqlsh.

Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.11.9 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
WARNING: pyreadline dependency missing.  Install to enable tab completion.
cqlsh>

I think casscandra is run normally.

My conf/janusgraph-cql.properties is

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

Then i run gremlin console and open the graph

gremlin> JanusGraphFactory.open('conf/janusgraph-cql.properties')

I get error

Could not instantiate implementation: org.janusgraph.diskstorage.cql.CQLStoreManager
Type ':help' or ':h' for help.
Display stack trace? [yN]
gremlin>

I find some similar question like Can not connect JanusGraph to local Cassandra on Mac and Janusgraph : Could not instantiate implementation: org.janusgraph.diskstorage.cql.CQLStoreManager But it don't seem right for me. What should I do or did I miss something?

Answer 1

Would require a stack trace to pin point the issue you are facing. But I have a session in which I have demonstrated the connection to JanusGraph using cassandra as backend.

JanusGraph DB Crash Course

You can find cassandra connection after 20 Minute.