title: org.apache.lucene.index.IndexNotFoundException: no segments* file found in org.apache.lucene.store.RAMDirectory
body: <p>I am new to Java and Lucene. My code gets a line from a file and stores it in Lucene Index. But when I create an <code>IndexReader</code> to search and read from the index it throws an exception. </p>
  
  <p>My java code is below. On creating the <code>IndexReader</code> it throws an <code>IndexNotFoundException</code></p>
  
  <pre><code>static String itemsfreq[];
  static StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_35);
  static IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_35, analyzer);
  
  public static void index_data(Directory indexed_document,int doc_num,IndexWriter w) throws IOException
      {
      for(int i = 0;i &lt; itemsfreq.length;i++)
          {
          Document doc = new Document();
          doc.add(new Field(Integer.toString(doc_num)+","+itemsfreq[i],itemsfreq[i++], Field.Store.YES, Field.Index.ANALYZED));
          w.addDocument(doc);
          }
      }
  //Gets string from a file and insert it in INDEX named indexed_document
  public static void main(String[] args) throws IOException
      {
      BufferedReader reader = new BufferedReader(new FileReader("fullText100.txt"));
      String line;
      int i = 0;
      Directory indexed_document = new RAMDirectory();
      IndexWriter writer = new IndexWriter(indexed_document, config);
      while((line=reader.readLine()) != null)
          {
          if(i == 1)
              {
              break;
              }
          itemsfreq = line.split(" ");
          index_data(indexed_document,i,writer);
          i++;
          }
  
      IndexReader r = IndexReader.open(indexed_document);
      } 
  </code></pre>