Neosemantics plugin is not detected

Neo4j Graph Platform
1

I'm running Neo4j Server version: 4.0.2 (community). I followed the directions on the neosemantics plugin installation.
I have

ls $NEO_HOME\plugins
apoc-4.0.0.11-all.jar               neo4j-graph-data-science-1.2.1-standalone.jar  README.txt
apoc-nlp-dependencies-4.0.0.11.jar  neosemantics-4.0.0.1.jar

and

more $NEO_HOME\conf/neo4j.conf | grep rdf
dbms.unmanaged_extension_classes=n10s.endpoint=/rdf

and

CALL dbms.procedures() YIELD name WHERE name STARTS WITH 'n10s' RETURN name
(no changes, no records)

APOC and GDS are working.
I saw other posts with the same problem. One solution was to make sure the plugin is in the plugins folder, which it is.
I restarted neo4j several times to no avail. What am I missing?

Thank you

2

Did you check the permissions on the plugin jar file?
Is ownership and r/w the same as apoc etc?

3

Yes, all four jars have the same permissions and ownership.

Thank you

4

Then I would have a look in the logs and hopefully there is a clue hidden somewhere...

5

Thank you, there is a whole slew of clues there :) Here is just from the top:
2020-07-10 02:11:28.528+0000 WARN [o.n.k.a.p.GlobalProcedures] Failed to load META-INF.versions.9.javax.xml.bind.ModuleUtil from plugin jar /opt/neo4j-community-4.0.2/plugins/neosemantics-4.0.0.1.jar: javax/xml/bind/ModuleUtil (wrong name: META-INF/versions/9/javax/xml/bind/ModuleUtil)
2020-07-10 02:11:28.530+0000 WARN [o.n.k.a.p.GlobalProcedures] Failed to load module-info from plugin jar /opt/neo4j-community-4.0.2/plugins/neosemantics-4.0.0.1.jar: module-info is not a class because access_flag ACC_MODULE is set
What follows is about two dozen of failure to load messages with the same error "com/github/jsonldjava/shaded/com/google/common/util/concurrent/internal/InternalFutureFailureAccess"
Does this provide enough information to debug the problem? or I can dump all of the error messages (which are all 'failed to load') in a file.

Thanks

6

What version of Java are you on?
How was that installed?

7

java version "11.0.6" 2020-01-14 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.6+8-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.6+8-LTS, mixed mode)

8

I am an absolute Java noob but it could be a version mismatch, perhaps you can open an issue on the neosemantics github project page and see if some one with more Java insight spots the issue..

9

We solved our problem by adding n10s.* to the whitelist in the configuration file:
dbms.security.procedures.whitelist=gds. ,apoc. , n10s.*

1 Like
10

thanks for documenting this.