neo4js | Neo4j REST client for JavaScript | Graph Database library
kandi X-RAY | neo4js Summary
kandi X-RAY | neo4js Summary
Neo4j REST client for JavaScript
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QUESTION
Does anyone have a gremlin-config.yaml file that would more accurately reflect how Gremlin acts in Neptune?
I am trying to run as much as I can using a local docker container, and I've substituted properties like gremlin.tinkergraph.vertexIdManager=ANY so that the Vertex IDs can be strings.
But I'm still missing details like multiple labels, which I think is only available via the Neo4Js config, unsure what else this will change.
But yeah, generally looking for a config that represents how Neptune functions as closely as possible
Current:
...ANSWER
Answered 2022-Feb-28 at 15:01It looks as if you have already done the things I usually recommend (such as enabling and using strings for the ID values). Given TinkerGraph does not support transactions currently, to simulate those you would likely need to consider using something like JanusGraph running in "inmemory" mode via a Gremlin Server. For the remaining differences, at the present time, it's mostly a case of avoiding any unsupported features such as meta properties in the code and queries that you write. Other than multiple labels as you mentioned, you should be able to do a lot of development and testing of queries locally but, of course, you will at some point still need to test against an actual Neptune cluster to verify the workloads that you have behave as expected when using the full Neptune cluster architecture.
QUESTION
I constructed an EMF model that should dictate the types of entities that are allowed to be stored in a Neo4J database instance.
I then wanted to annotate the EMF model classes with Neo4J OGM (version 3.2.28) to keep the connection to Neo4J as easy as possible.
It looks something like this:
BaseElement and ToolNameArtefact are abstract. The field uuid in BaseElementImpl is annotated with org.neo4j.ogm.annotation.Id.
Now, when I try to store an instance of ConcreteArtefact via Session#save(), I get the following error message:
org.neo4j.ogm.exception.core.MappingException: Field with primary id is null for entity foo.bar.ConcreteArtefact@64d43929 (uuid: 7745782f-2c61-4450-985a-8cf2986afa49, projectName: ) at org.neo4j.ogm.context.MappingContext.nativeId(MappingContext.java:556) at org.neo4j.ogm.cypher.compiler.CypherContext.getIdentity(CypherContext.java:66) at org.neo4j.ogm.cypher.compiler.CypherContext.visitedNode(CypherContext.java:90) at org.neo4j.ogm.context.EntityGraphMapper.mapEntity(EntityGraphMapper.java:267) at org.neo4j.ogm.context.EntityGraphMapper.map(EntityGraphMapper.java:170) at org.neo4j.ogm.session.delegates.SaveDelegate.lambda$save$1(SaveDelegate.java:89) at java.util.Collections$SingletonList.forEach(Collections.java:4822) at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:89) at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:479)
Although the uuid field is clearly set.
My package names are all lower-case.
Moving the NodeEntity annotations to the interfaces instead of the implementing classes did not help.
The classes in question have a no-arg constructor.
...ANSWER
Answered 2022-Feb-09 at 12:45This behavior was a problem with Neo4J OGM itself. A developer answered in this thread, that the issue will be fixed in future versions (starting from 3.2.29)
QUESTION
So I'm using neo4j-enterprise edition loaded with docker.
...ANSWER
Answered 2021-Aug-11 at 13:15When you create a session, you can pass a SessionConfig instance with the database name, built via SessionConfig.Builder: https://neo4j.com/docs/api/java-driver/current/org/neo4j/driver/SessionConfig.Builder.html#withDatabase-java.lang.String-.
QUESTION
I am working on a crawler to analyze the internal link structure of websites using a neo4j graph database in combination with spatie crawler.
The idea goes like this:
Whenever a URL is crawled, all Links will be extracted from the DOM. For all links, a node will be created and a relation foundOn->target is added.
ANSWER
Answered 2021-Aug-18 at 12:18You should replace:
QUESTION
I'm scanning our software every night with the jQAssistant Maven plugin. If the Neo4J database is empty, everything is ok. But later, I get a lot of errors:
...ANSWER
Answered 2021-Sep-13 at 13:15I now use a Jenkins pipeline to first clean the external JQAssistant database and then scan the software. This error hasn't occured since.
QUESTION
ANSWER
Answered 2021-Mar-17 at 15:02Neo4j OGM 3.2 requires at least Neo4j 3.5.x (as you can see here), but you're using Neo4j 3.0.x. Note: the latest OGM version is 3.2.21.
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