Neo4j的索引没有找到节点

我试图按照文档和我结束了这段代码为Neo4j的1.8：Neo4j的索引没有找到节点

graphDB = new GraphDatabaseFactory() 
      .newEmbeddedDatabaseBuilder(BASE_FOLDER + NEO4J_PATH) 
      .newGraphDatabase(); 

registerShutdownHook(); 

//Check if there are any indexes 
System.out.println(Arrays.toString(graphDB.index().nodeIndexNames())); 
Index<Node> testIndex = graphDB.index().forNodes("test"); 

Transaction tx = graphDB.beginTx(); 
try { 
    String nameKey = "name"; 
    String nameValue = "Gevorg"; 

    //The following 3 lines will be commented out 
    //when I run the program the second time 
    Node me = graphDB.createNode(); 
    me.setProperty(nameKey, nameValue); 
    testIndex.add(me, nameKey, nameValue); 

    Node meAgain = testIndex.get(nameKey, nameValue).getSingle(); 
    System.out.println(meAgain.getProperty(nameKey)); 

} finally { 
    tx.finish(); 
}

这将打印以下预期：

[] //There is no index at the very beginning 
Gevorg

后，程序终止，我评论了节点/索引的创建，然后再次运行该程序以触发NullPointerException（meAgain为null）。由于程序首先打印[test]，但是Node meAgain = testIndex.get(nameKey, nameValue).getSingle();未能检索到节点，因此索引被正确检索。我尝试使用和不使用交易。我究竟做错了什么？？

来源

2012-10-05 Gevorg

你需要调用tx.finish

tx.success()

HTH

/彼得

之前标记您的Tx一样成功，

来源

2012-10-05 04:32:12

Neo4j的索引没有找到节点

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