Question

我无法使用JAVA API创建索引。我的代码是：

graphDb = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH );
registerShutdownHook();
// END SNIPPET: startDb

// START SNIPPET: addUsers
Transaction tx = graphDb.beginTx();
try
{
    nodeIndex = graphDb.index().forNodes( "nodes" );
    // Create some users and index their names with the IndexService
    for ( int id = 0; id < 100; id++ )
    {
        createAndIndexUser( idToUserName( id ) );
    }
    // END SNIPPET: addUsers

    // Find a user through the search index
    // START SNIPPET: findUser
    int idToFind = 45;
    String userName = idToUserName( idToFind );
    Node foundUser = nodeIndex.get( USERNAME_KEY, userName ).getSingle();

    System.out.println( "The username of user " + idToFind + " is "
        + foundUser.getProperty( USERNAME_KEY ) );
    // END SNIPPET: findUser

    // Delete the persons and remove them from the index
    for ( Node user : nodeIndex.query( USERNAME_KEY, "*" ) )
    {
        nodeIndex.remove(  user, USERNAME_KEY, user.getProperty( USERNAME_KEY ) );
        user.delete();
    }
    tx.success();
}
finally
{
    tx.finish();
}

错误：

线程“main”中的异常java.lang.IllegalArgumentException：否   索引提供商'lucene'找到了。也许是预期的提供者（或者一个   更多的依赖项）不在类路径上，或者没有   负荷。

at org.neo4j.kernel.IndexManagerImpl.getIndexProvider（IndexManagerImpl.java:90）
  at org.neo4j.kernel.IndexManagerImpl.findIndexConfig（IndexManagerImpl.java:141)
  在org.neo4j.kernel.IndexManagerImpl.getOrCreateIndexConfig（IndexManagerImpl.java:208）
  at org.neo4j.kernel.IndexManagerImpl.getOrCreateNodeIndex（IndexManagerImpl.java:318)
  at org.neo4j.kernel.NodeAutoIndexerImpl.getIndexInternal（NodeAutoIndexerImpl.java:85）
  at org.neo4j.kernel.AbstractAutoIndexerImpl.getAutoIndex（AbstractAutoIndexerImpl.java:82）
  在com.neo4j.Indexing.main（Indexing.java:39）   Java结果：1

Answer 1

Neo4j使用Lucene作为其默认索引提供程序。确保在类路径中有neo4j-lucene-index.jar。您可以从here下载适当版本的jar。

无法使用JAVA api创建索引

1 个答案: