Trouble Installing n10s Plugin Manually in Neo4j Desktop 5.26.0

General Newbie Questions
1

Hi everyone! Glad to be here.

I’m an epidemiology researcher working with the ComptoxAI RDF dataset. When Neo4j Desktop supported the n10s plugin, I successfully imported RDF files and queried specific nodes using Cypher and Python.

Now, using Neo4j Desktop v2.0.5 and DB version 5.26.0, I’ve tried manually installing n10s-5.26.0.jar by:

  • Copying the JAR file to the plugins/ folder

  • Adding dbms.unmanaged_extension_classes=n10s.endpoint=/rdf to neo4j.conf

However, running:

SHOW PROCEDURES YIELD name, description

returns no n10s entries, and CALL n10s.graphconfig.init() fails.

Has anyone successfully installed n10s manually in Neo4j 5.x (especially 5.26.0)? Or is there a specific version combo that works reliably?

Appreciate any help or tips!

2

@razieh.moghadam

didnt try with Neo4j desktop but rather a simple local install on Ubuntu.
One thing i notice, and not sure if its the entire cause but if you define conf/neo4j.conf with

dbms.unmanaged_extension_classes=n10s.endpoint=/rdf

then on start we see

Warning: Use of deprecated setting 'dbms.unmanaged_extension_classes'. It is replaced by 'server.unmanaged_extension_classes'.

so changing conf/neo4j.conf to

server.unmanaged_extension_classes=n10s.endpoint=/rdf

though this had no impact relative to N10 being available or not.

Does your logs\debug.log report referneces to n10 and or neosemantics. For example on a linux platform running with Neosemantics successfully installed

egrep "n10|neosemantics" ../logs/debug.log

returns

[classpath] /home/neo4j/single/instance1/neo4j-enterprise-5.26.0/plugins/neosemantics-5.26.0.jar
                                                                server.unmanaged_extension_classes=ThirdPartyJaxRsPackage[packageName=n10s.endpoint, mountPoint=/rdf]
2025-11-04 12:39:43.308+0000 WARN  [o.n.k.a.p.GlobalProcedures] Failed to load `org.apache.http.impl.client.cache.memcached.MemcachedHttpCacheStorage` from plugin jar `/home/neo4j/single/instance1/neo4j-enterprise-5.26.0/plugins/neosemantics-5.26.0.jar`: java.lang.NoClassDefFoundError: net/spy/memcached/OperationTimeoutException
2025-11-04 12:39:43.965+0000 WARN  [o.n.k.a.p.GlobalProcedures] Failed to load `module-info` from plugin jar `/home/neo4j/single/instance1/neo4j-enterprise-5.26.0/plugins/neosemantics-5.26.0.jar`: java.lang.NoClassDefFoundError: module-info is not a class because access_flag ACC_MODULE is set
2025-11-04 12:39:44.072+0000 WARN  [o.n.k.a.p.GlobalProcedures] Failed to load `org.apache.http.impl.client.cache.ehcache.EhcacheHttpCacheStorage` from plugin jar `/home/neo4j/single/instance1/neo4j-enterprise-5.26.0/plugins/neosemantics-5.26.0.jar`: java.lang.NoClassDefFoundError: net/sf/ehcache/Ehcache
2025-11-04 12:39:45.554+0000 INFO  [o.n.s.m.ThirdPartyJAXRSModule] Mounted unmanaged extension [n10s.endpoint] at [/rdf]
3

For me n10s stopped installing on a fresh docker container since around March or April ...

"n10s" is not a known Neo4j plugin. Options are:
apoc
apoc-extended
bloom
fleet-management
genai
graph-data-science