Question

我的本地neo4j数据库路径是C：\ neo4j-community-1.9.3_bup

我创建了一个简单的java程序来连接neo4j DB并插入一些节点。

但插入之后我试图通过Neo4jDataBrower来检索这些节点，这些节点没有列出。

我使用的代码来自neo4j门户网站，

    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();
    }

为什么它不起作用？

请建议我..我遇到了一些问题vth路径或问题vth代码？

嗨Werner，

运行时异常是

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

新记录，

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不是有效路径。它应该是C:\\neo4j-community-1.9.3_bup。

但是，如果您指向Neo4J安装目录而不是数据库目录本身，它可能无效。如果是这种情况，则路径应为C:\\neo4j-community-1.9.3_bup\data\graph.db

<强>编辑：

要防止锁定情况，请停止正在运行的Neo4J实例，并使用自己的Web控制台启动自己的数据库，方法是在初始化嵌入式数据库的行之后插入这些行：

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();

我的java程序无法更新Neo4j DB

1 个答案: