Моя Java-программа не может обновить базу данных Neo4j

Question

Мой локальный путь к базе данных neo4j - C:\neo4j-community-1.9.3_bup

Я создал простую Java-программу для подключения к базе данных neo4j и вставки некоторых узлов.

Но после вставки, когда я пытаюсь извлечь эти узлы через Neo4jDataBrower, они не отображаются.

Код, который я использовал, взят с самого портала neo4j,

    String DB_PATH = "C\\neo4j-community-1.9.3_bup";
    Map<String, String> config = new HashMap<String, String>();
    config.put( "neostore.nodestore.db.mapped_memory", "10M" );
    config.put( "string_block_size", "60" );
    config.put( "array_block_size", "300" );
    graphDb = new GraphDatabaseFactory().newEmbeddedDatabaseBuilder(DB_PATH).setConfig(config).newGraphDatabase();
    registerShutdownHook( graphDb );
    Transaction tx = graphDb.beginTx();
    try
    {
        firstNode = graphDb.createNode();
        firstNode.setProperty( "message", "Hello, " );
        secondNode = graphDb.createNode();
        secondNode.setProperty( "message", "World!" );
        relationship = firstNode.createRelationshipTo( secondNode, RelTypes.KNOWS );
        relationship.setProperty( "message", "brave Neo4j " );
        tx.success();
    }
    finally
    {
        tx.finish();
    }

Почему это не работает?

Пожалуйста, предложите мне... Есть ли проблема VTH путь, который я дал, или проблема VTH код?

Привет Вернер,

Исключение во время выполнения

Exception in thread "main" java.lang.RuntimeException:
 org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.StoreLockerLifecycleAdapter@406199' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:280)
    at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:106)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:88)
    at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:207)
    at com.Neo4J.src.EmbeddedNeo4j.createDb(EmbeddedNeo4j.java:54)
    at com.Neo4J.src.EmbeddedNeo4j.main(EmbeddedNeo4j.java:38)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.StoreLockerLifecycleAdapter@406199' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:497)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:104)
    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:258)
    ... 5 more
Caused by: org.neo4j.kernel.StoreLockException: Could not create lock file
    at org.neo4j.kernel.StoreLocker.checkLock(StoreLocker.java:74)
    at org.neo4j.kernel.StoreLockerLifecycleAdapter.start(StoreLockerLifecycleAdapter.java:40)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:491)
    ... 7 more

Новый журнал,

Exception in thread "main" java.lang.RuntimeException: 

org.neo4j.kernel.lifecycle.LifecycleException: 

Component 'org.neo4j.kernel.impl.transaction.TxManager@1827284' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:280)
    at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:106)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:88)
    at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:207)
    at com.Neo4J.src.EmbeddedNeo4j.createDb(EmbeddedNeo4j.java:57)
    at com.Neo4J.src.EmbeddedNeo4j.main(EmbeddedNeo4j.java:41)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component
 'org.neo4j.kernel.impl.transaction.TxManager@1827284' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:497)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:104)
    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:258)
    ... 5 more
Caused by: org.neo4j.graphdb.TransactionFailureException:
 Unable to start TM, no active tx log file found but found either tm_tx_log.1 or tm_tx_log.2 file, please set one of them as active or remove them.
    at org.neo4j.kernel.impl.transaction.TxManager.openLog(TxManager.java:750)
    at org.neo4j.kernel.impl.transaction.TxManager.start(TxManager.java:138)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:491)
    ... 7 more

Новое исключение,

Sep 27, 2013 11:09:27 AM org.neo4j.server.logging.Logger log
INFO: Starting Neo Server on port [7474] with [40] threads available
2013-09-27 11:09:27.665:INFO::Logging to STDERR via org.mortbay.log.StdErrLog
Sep 27, 2013 11:09:27 AM org.neo4j.server.logging.Logger log
INFO: Using database at C:\neo4j-community-1.9.3_bup\data\graph.db
Exception in thread "main" java.lang.NoSuchFieldError: remote_shell_enabled
    at org.neo4j.server.database.Database.createDatabase(Database.java:77)
    at org.neo4j.server.database.Database.<init>(Database.java:55)
    at org.neo4j.server.NeoServerWithEmbeddedWebServer.startDatabase(NeoServerWithEmbeddedWebServer.java:179)
    at org.neo4j.server.NeoServerWithEmbeddedWebServer.start(NeoServerWithEmbeddedWebServer.java:93)
    at org.neo4j.server.Bootstrapper.start(Bootstrapper.java:87)
    at org.neo4j.server.Bootstrapper.start(Bootstrapper.java:76)
    at com.Neo4J.src.EmbeddedNeo4j.createDb(EmbeddedNeo4j.java:69)
    at com.Neo4J.src.EmbeddedNeo4j.main(EmbeddedNeo4j.java:41)

Answer 1

C\\neo4j-community-1.9.3_bup не является допустимым путем. Так должно быть C:\\neo4j-community-1.9.3_bup,

Но, тем не менее, он может быть недействительным, если вы указываете на каталог установки Neo4J, а не на сам каталог базы данных. Если это так, путь должен быть C:\\neo4j-community-1.9.3_bup\data\graph.db

Отредактировано:

Чтобы предотвратить ситуацию блокировки, остановите работающий экземпляр Neo4J и запустите свою собственную базу данных с собственной веб-консолью, вставив следующие строки после строки, в которой вы инициализируете встроенную базу данных:

Configurator configurator = new ServerConfigurator((GraphDatabaseAPI)graphDb);
configurator.configuration().setProperty(Configurator.WEBSERVER_ADDRESS_PROPERTY_KEY, "127.0.0.1");
configurator.configuration().setProperty(Configurator.WEBSERVER_PORT_PROPERTY_KEY, 7474);

WrappingNeoServerBootstrapper bootstrapper = new WrappingNeoServerBootstrapper((GraphDatabaseAPI)graphDb, configurator);
bootstrapper.start();