Neosemantics 3.5 installation error: "The ResourceConfig instance does not contain any root resource classes"

[sidale97]

Hi.
I'm on Ubuntu 20 (but I also got the same error when I was on Ubuntu18).

Here's what I did:

1. downloaded neo4j community server 3.5.23
2. downloaded Neosemantics 3.5.0.4 (but I also tried any other 3.x)
3. moved the Neosemantics jar into /plugins and (as instructed) added the follwing line to /conf/neo4j.conf : "dbms.unmanaged_extension_classes=n10s.endpoint=/rdf"
4. tried to start neo4j by command line

But it fails to start, giving the following error:

Active database: graph.db
Directories in use:
  home:         /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23
  config:       /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23/conf
  logs:         /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23/logs
  plugins:      /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23/plugins
  import:       /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23/import
  data:         /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23/data
  certificates: /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23/certificates
  run:          /home/sd/Downloads/neo4j.3.5/neo4j-community-3.5.23/run
Starting Neo4j.
WARNING: Max 1024 open files allowed, minimum of 40000 recommended. See the Neo4j manual.
2020-11-11 18:21:10.066+0000 INFO  ======== Neo4j 3.5.23 ========
2020-11-11 18:21:10.076+0000 INFO  Starting...
2020-11-11 18:21:14.236+0000 INFO  Bolt enabled on 127.0.0.1:7687.
2020-11-11 18:21:15.535+0000 INFO  Started.
2020-11-11 18:21:15.702+0000 INFO  Mounted unmanaged extension [n10s.endpoint] at [/rdf]
2020-11-11 18:21:16.126+0000 ERROR The ResourceConfig instance does not contain any root resource classes.
2020-11-11 18:21:16.126+0000 WARN  unavailable The ResourceConfig instance does not contain any root resource classes.
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
	at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99)

and many more lines from the java stack trace... until, after the stack trace,

2020-11-11 18:21:16.130+0000 ERROR Failed to start Neo4j on 127.0.0.1:7474: org.neo4j.server.web.NeoServletContainer-18876fa9@26337822==org.neo4j.server.web.NeoServletContainer,jsp=null,order=-1,inst=false,async=true
2020-11-11 18:21:16.136+0000 INFO  Stopping...
2020-11-11 18:21:16.302+0000 INFO  Stopped.
2020-11-11 18:21:16.304+0000 ERROR Failed to start Neo4j: Starting Neo4j failed: Component 'org.neo4j.server.AbstractNeoServer$ServerComponentsLifecycleAdapter@59ebe484' was successfully initialized, but failed to start. Please see the attached cause exception "The ResourceConfig instance does not contain any root resource classes.". Starting Neo4j failed: Component 'org.neo4j.server.AbstractNeoServer$ServerComponentsLifecycleAdapter@59ebe484' was successfully initialized, but failed to start. Please see the attached cause exception "The ResourceConfig instance does not contain any root resource classes.".
org.neo4j.server.ServerStartupException: Starting Neo4j failed: Component 'org.neo4j.server.AbstractNeoServer$ServerComponentsLifecycleAdapter@59ebe484' was successfully initialized, but failed to start. Please see the attached cause exception "The ResourceConfig instance does not contain any root resource classes.".
	at org.neo4j.server.exception.ServerStartupErrors.translateToServerStartupError(ServerStartupErrors.java:45)

Followed by another stack trace.
After which ,finally, I get

2020-11-11 18:21:16.305+0000 INFO  Neo4j Server shutdown initiated by request

And that's it.

I don't get any errors with neo4j 4 and neosemantics 4.

I've tried overriding the JAVA_HOME enviroment variable by setting it to java8, java11 and java14. The only difference between the three is that java11 has an additional first output line warning me to use java8.

Any idea on how to solve this?