我的Java程序無法更新Neo4j DB

Question

我本地的neo4j db路徑是C：\\ neo4j-community-1.9.3_bup

我創建了一個簡單的Java程序來連接neo4j DB並插入一些節點。

但是插入后，當我嘗試通過Neo4jDataBrower檢索這些節點時，這些未列出。

我使用的代碼來自neo4j門戶網站本身，

    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();
    }

為什么它不起作用？

請建議我..是否存在我給出的某些問題或代碼問題？

嗨沃納，

運行時異常為

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

新日志，

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

新的例外

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不是有效的路徑。 它應該是C:\\\\neo4j-community-1.9.3_bup 。

但是，如果您指向的是Neo4J安裝目錄，而不是數據庫目錄本身，則它可能無效。 如果是這種情況，則路徑應為C:\\\\neo4j-community-1.9.3_bup\\data\\graph.db

編輯：

為了防止出現鎖定情況，請在初始化嵌入式數據庫的行之后插入以下行，從而停止正在運行的Neo4J實例，並使用其自己的Web控制台啟動自己的數據庫：

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();