No segments* file found in RAMDirectory

Question

I'm using Lucene to create an concept-based image search engine. Firstly, I open my database and copy it into a RAM index. Then I write an analyzer to find user input word and its synonym. At last, I want to open the index to get results.

getImage() - Used to call addDoc() copy database into my index

This is getImageResult() which I want to used to get result. I think maybe this is the bug.

However, if I remove:

StandardAnalyzer analyzer = new StandardAnalyzer();
IndexWriterConfig config = new IndexWriterConfig(analyzer);

IndexWriter iwriter = new IndexWriter(index, config);
iwriter.commit();

It will raise an exception: no segments* file found in RAMDirectory. And if I Keep this part, I can't get any result.

Answer 1

I'm not entirely sure, but I assume you are trying to write to an index with your first snippet there, and then search it with the second, right?

Your getImageResult() method in opening a brand new index in a brand new directory. Anything previously written to a different RAMDirectory will not be available for you to search there.

You should either:

• Use the same RAMDirectory in both places, or
• Open your index in an FSDirectory , with which it will be saved to the file system, and can be reopened. See FSDirectory.open