I'm trying to create an unmanaged extension using this. I'm currently using a Windows environment
Now, I followed everything and here is what my pom file looks now:
POM
and here is my java class containing the unmanaged extension
HelloWorldResource
Now, I tried to run "**mvn clean package**", and it produced a jar file around 10MB which I then put into the plugins folder of my database.
When I start the server, the following error always appears:
Starting Neo4j failed:
org.neo4j.server.web.NeoServletContainer-49fd135#9bfd861c==org.neo4j.server.web.NeoServletContainer,-1,false
The log file is not useful as it doesn't show any exception that cause the it. Other people also reported the issue in stack overflow and appears to be a jar issue. What else could I have missed?
Neo4j fails to start
Neo4j fails in startup
PS: I'm using 3.0.3 Neo4j Community Edition.
Related
I am trying to import the Hetionet into the Neo4j and I follow the guidiance below:
https://github.com/hetio/hetionet/tree/master/hetnet/neo4j
While using the command
curl --insecure --location https://github.com/hetio/hetionet/raw/master/hetnet/neo4j/hetionet-v1.0.db.tar.bz2 | tar --extract --bzip2
The error “curl: (23) Failure writing output to destination” has been thrown.
Therefore I just downloaded the file directly and moved to the directory ".Neo4jDesktop\relate-data\dbmss\dbms-0d0d3324-d1a6-4d3e-b82c-0c4451a8c880\data\databases"
After I started the database, It showed that this database is currently offline. When I trying to do some operations to it, the error "Neo.TransientError.Database.DatabaseUnavailable" has been shown.
Some valuable informations in the log file debug.log are as below:
2022-07-19 23:11:53.896+0000 ERROR [c.n.d.DbmsReconciler] Encountered error when attempting to reconcile database graph.db (request by SystemGraph:1) to state 'online', database remains in state 'offline'
org.neo4j.dbms.api.DatabaseManagementException: Unable to start database DatabaseId{7a8c6b65[graph.db]}
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.database.Database#3da82075' was successfully initialized, but failed to start. Please see the attached cause exception "Unknown store version 'v0.A.7'".
The version of the dump you are trying to import is pretty old. From the readme
The database has been migrated to the Neo4j 3.0.1 Community Edition.
If you use a current 4.4 version of the database, the only thing you can do is to cascade through multiple versions and upgrade the store.
I am not yet sure if you really need each minor version to work properly.
Maybe it's already enough to go from 3.0 to 3.5 and follow this guide https://neo4j.com/docs/upgrade-migration-guide/current/migration/migrate-to-4.0/migrate-single-instance/
Otherwise starting 3.1-3.5 with allow_upgrade=true on the stores is the only option I see. There are Docker images available at
https://hub.docker.com/_/neo4j/ also for those older, unsupported versions.
Edit: You should be able to start/upgrade it with 3.3 and then again with 3.5 and then run a 4.4 neo4j-admin copy
I'm trying to connect Websphere 8.5.5 with oracle 12c DB and WAS throwing an error saying java.lang.ClassNotFoundException: oracle.xml.parser.v2.XMLParseException. Initially we got xdbtype class was not found and we resolved this by adding xdb6.jar to WAS's lib directory. Now even after adding xmlparserv2.jar to WAS's lib directory we are facing the same issue and it looks like WAS is not recognizing the jar file we deployed in lib directory. We are not sure whether this is problem in loading the jar file or its a version mismatch issue since xmlparserv2.jar is not available in Oracle pages to download. Please guide me on how to fix this issue.
After upgrading from Neo4j 2.2.5 to Neo4j 2.3.1 on Windows Server 2012 R2 with Java 8.45, we encountered a problem with file handles. When running the command shown at the bottom of this post using either the web interface or neo4jshell.bat, the cypher completes successfully and a process monitor trace confirms that Java successfully closed the file. However, I am unable to move that csv file because the file is open in another process. Handle.exe confirms that Java still has a read-write handle on that file.
When I run the same process against a Neo4j 2.2.5 graph on the same machine with the same file, Java does not retain the read-write handle on the csv file. We will need to revert to 2.2.5 until this issue is resolved. The only application change we made during the upgrade from 2.2.5 to 2.3.1 was to accommodate the new file reference format (file:///x://filename.csv vs. file:x:/filename.csv).
Are there other actions we can take short of restarting the service or stopping and starting the drive to force Java to close this file? I understand that Neo4jShell.bat is deprecated in favor of the powershell commands, but ultimately the issue is that Java is retaining the file handle, so changing the method of delivering the cypher command can't improve the way Java is handling the csv file. I've run the same cypher from both the web interface and neoj4shell.bat and gotten the same result.
USING PERIODIC COMMIT 3000
LOAD CSV WITH HEADERS
FROM "file:///x://filename.csv"
AS line
MATCH (a:node {id : line.id}), (b:othernode {id : line.other_id})
WITH a, b
WHERE shortestPath((a)-[:PREVIOUS]->(b)) is null
CREATE (a)-[:PREVIOUS]->(b);
I have created nodes and relationships in java using Neo4j jars,I am trying to display the same from Neoclipse,
I am getting Exception when trying to create connection from Neoclipse to the folder created by java program (I am using windows 7) .
Exception:
java.lang.IllegalStateException:Mismatching store version found(v0.A.1 while expecting v0.A.0)
and the store is not cleanly shutdown.
Recover the database with previous database version and then attempt to upgrade .
after this i added graphDb.shutdown(); code then i got different exception:
org.neo4j.kernel.impl.storemigration.StoreUpgrader$UnableToUpgradeException:
Not all store Files match the version required for successful upgrade.
List of jar Files:
geronimo-jta_1.1_spec-1.1.1.jar
lucene-core-3.6.2.jar
neo4j-2.0.1.jar
neo4j-cypher-2.0.1.jar
neo4j-graph-algo-2.0.1.jar
neo4j-graph-matching-2.0.1.jar
neo4j-jmx-2.0.1.jar
neo4j-kernel-2.0.1.jar
neo4j-lucene-index-2.0.1.jar
neo4j-udc-2.0.1.jar
Please guide me.
It looks like you've created your datastore with Neo4j 2.0.1. Neoclipse seems to use an earlier version. Datastore downgrades are not supported.
However you could drop your database into a Neo4j 2.0.1 server and connect to it remotely using Neoclipse.
I installed Neo4j as instructed in the site and was able to install and stat server. However I tried to copy the Beer example DB by stopping the server and deleting the current graph.db in the \data folder and replaced with the one Beer example downloaded from online (graph.db folder). This is the only step I did.
Now the issue is, when i tried to start the Server I get "StartService FAILED 1053"
I am using following command on the powershell in windows - c:\neo4j-community-2.0.0-M03> .\bat\Neo4j.bat start
Can someone please help if I have done anything wrong here.
Thank you!
You are running neo4j 2.0 against an older database file. You'll need to set the config parameter to allow the store to be upgraded before starting. See instructions here:
http://docs.neo4j.org/chunked/milestone/deployment-upgrading.html#_explicit_upgrade