CODEWITHSUNDEEP
javaneo4j
Sandeep Singh
Sandeep Singh

Reputation: 33

embedded Neo4j in JVM

I am trying to access a neo4j database from my java program. I tried to create a fresh db and query it, and it ran successfully as per: http://neo4j.com/docs/java-reference/current/#tutorials-java-embedded

Code:

String DB_PATH = "C:/Users/singsand/Documents/Neo4j/newdb";
    File f=new File(DB_PATH);
    GraphDatabaseService graphDb =   new GraphDatabaseFactory().newEmbeddedDatabase(f);
    try (Transaction tx=graphDb.beginTx()){
        graphDb.execute("CREATE (table1:car {name:'car1'})");
        tx.success();
    }

But then I started this db as a server through the Neo4j community edition tool and also accessed it through my browser.

After that, when i executed the same java program I used above, it throws the following error:

    Exception in thread "main" java.lang.RuntimeException: Error starting org.neo4j.kernel.impl.factory.CommunityFacadeFactory, C:\Users\singsand\Documents\Neo4j\newdb
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:144)
    at org.neo4j.kernel.impl.factory.CommunityFacadeFactory.newFacade(CommunityFacadeFactory.java:40)
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:108)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory.newDatabase(GraphDatabaseFactory.java:100)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory.lambda$createDatabaseCreator$193(GraphDatabaseFactory.java:89)
    at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:183)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:65)
    at neo4j.neo4jdemo.App.main(App.java:41)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.recovery.Recovery@62fca613' failed to initialize. Please see attached cause exception.
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:416)
    at org.neo4j.kernel.lifecycle.LifeSupport.init(LifeSupport.java:62)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:98)
    at org.neo4j.kernel.NeoStoreDataSource.start(NeoStoreDataSource.java:508)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:434)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107)
    at org.neo4j.kernel.impl.transaction.state.DataSourceManager.start(DataSourceManager.java:99)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:434)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107)
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:140)
    ... 7 more
Caused by: java.lang.IllegalArgumentException: Unrecognized log entry version -9. At position LogPosition{logVersion=0, byteOffset=16} and entry version null
    at org.neo4j.kernel.impl.transaction.log.entry.LogEntryVersion.byVersion(LogEntryVersion.java:147)
    at org.neo4j.kernel.impl.transaction.log.entry.VersionAwareLogEntryReader.readLogEntry(VersionAwareLogEntryReader.java:83)
    at org.neo4j.kernel.impl.transaction.log.LogEntryCursor.next(LogEntryCursor.java:50)
    at org.neo4j.kernel.recovery.LatestCheckPointFinder.find(LatestCheckPointFinder.java:77)
    at org.neo4j.kernel.recovery.PositionToRecoverFrom.apply(PositionToRecoverFrom.java:53)
    at org.neo4j.kernel.recovery.DefaultRecoverySPI.getPositionToRecoverFrom(DefaultRecoverySPI.java:112)
    at org.neo4j.kernel.recovery.Recovery.init(Recovery.java:72)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:406)
    ... 16 more

I have seen similar errors in other Stack Overflow questions, but wasn't able to solve my issue using their solutions.

Upvotes: 0

Views: 357

Answers (1)

MicTech
MicTech

Reputation: 45123

If I understand correctly. You are using embedded version of Neo4j in your app and than you are trying to start Neo4j server on your localhost. Is that right?

Neo4j Server vs Embedded mode

The thing is Neo4j embedded is running as part of your Java application. Neo4j server is standalone service which is run separately. And you can't combine those two on the same db.

If you want to use Neo4j browser with your embedded db this should help you - http://graphaware.com/neo4j/2014/11/21/neo4j-browser-with-embedded.html

Upvotes: 1

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