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PONo class definition found error occurs while trying to run the lucene app from command line
 

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  1. PONo class definition found error occurs while trying to run the lucene app from command line
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    <p>I'm a beginner to lucene and I had tried to run a sample app (HelloLucene.java) given in the website <a href="http://www.lucenetutorial.com/lucene-in-5-minutes.html" rel="nofollow noreferrer">http://www.lucenetutorial.com/lucene-in-5-minutes.html</a>. The code was successfully compiled and a class file (HelloLucene.class) was created for the app. </p> <p>But while trying to run the app, following error occurs </p> <ul> <li>could not find or load main class HelloLucene</li> </ul> <p>I had referred with the link <a href="https://stackoverflow.com/questions/9258005/java-program-uses-or-overrides-a-deprecated-api">Java program uses or overrides a deprecated API?</a> and tried the solutions provided, but all in vain. please help me to solve this problem.</p> <p>The command which I used to run the code is</p> <ul> <li>java HelloLucene lucene</li> </ul> <p>code which I tried to run:</p> <pre><code>import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.document.Field; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.queryParser.ParseException; import org.apache.lucene.queryParser.QueryParser; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.ScoreDoc; import org.apache.lucene.search.TopScoreDocCollector; import org.apache.lucene.store.Directory; import org.apache.lucene.store.RAMDirectory; import org.apache.lucene.util.Version; import java.io.IOException; public class HelloLucene { public static void main(String[] args) throws IOException, ParseException { // 0. Specify the analyzer for tokenizing text. // The same analyzer should be used for indexing and searching StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_35); // 1. create the index Directory index = new RAMDirectory(); IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_35, analyzer); IndexWriter w = new IndexWriter(index, config); addDoc(w, "Lucene in Action"); addDoc(w, "Lucene for Dummies"); addDoc(w, "Managing Gigabytes"); addDoc(w, "The Art of Computer Science"); w.close(); // 2. query String querystr = args.length &gt; 0 ? args[0] : "lucene"; // the "title" arg specifies the default field to use // when no field is explicitly specified in the query. Query q = new QueryParser(Version.LUCENE_35, "title", analyzer).parse(querystr); // 3. search int hitsPerPage = 10; IndexReader reader = IndexReader.open(index); IndexSearcher searcher = new IndexSearcher(reader); TopScoreDocCollector collector = TopScoreDocCollector.create(hitsPerPage, true); searcher.search(q, collector); ScoreDoc[] hits = collector.topDocs().scoreDocs; // 4. display results System.out.println("Found " + hits.length + " hits."); for(int i=0;i&lt;hits.length;++i) { int docId = hits[i].doc; Document d = searcher.doc(docId); System.out.println((i + 1) + ". " + d.get("title")); } // searcher can only be closed when there // is no need to access the documents any more. searcher.close(); } private static void addDoc(IndexWriter w, String value) throws IOException { Document doc = new Document(); doc.add(new Field("title", value, Field.Store.YES, Field.Index.ANALYZED)); w.addDocument(doc); } } </code></pre>
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    1. USrajesh
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      1. USRob Kielty
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    1. COHi Rajesh, please update the question with the command that you are using to run the code. Given that you compiled the code successfully the root cause is likely there.
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      1. PONo class definition found error occurs while trying to run the lucene app from command line
      1. USRob Kielty
    2. COya thank you Rob. I will update with the command that I used to run the code.
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      1. USrajesh
 

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