java - Exception in thread "main" org.apache.lucene.index.IndexNotFoundException: no segments* file found in org.apache.lucene.store.SimpleFSDirectory -

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import java.io.file; import java.io.filereader; import java.io.ioexception; import java.io.reader; import java.util.date;   import org.apache.lucene.analysis.standard.standardanalyzer; import org.apache.lucene.document.document; import org.apache.lucene.document.textfield; import org.apache.lucene.index.directoryreader; import org.apache.lucene.index.indexreader; import org.apache.lucene.index.indexwriter; import org.apache.lucene.store.simplefsdirectory; import org.apache.lucene.index.indexwriterconfig; import org.apache.lucene.queryparser.classic.parseexception; import org.apache.lucene.queryparser.classic.queryparser; import org.apache.lucene.search.indexsearcher; import org.apache.lucene.search.query; import org.apache.lucene.search.topdocs; import org.apache.lucene.util.version; import org.apache.lucene.store.directory;   public class openbookcrackindexer {      public static final version luceneversion = version.lucene_43;      /**      * @param args command line arguments      */     public static int index(file indexdir, directory datadir) throws ioexception {           indexwriterconfig luceneconfig = new indexwriterconfig(                 luceneversion, new standardanalyzer(luceneversion));          indexwriter writer = new indexwriter(datadir, luceneconfig);          file[] files = indexdir.listfiles();         (file file : files) {              if (file.getname().endswith(".pdf")) {                 document document = new document();                  string path = file.getcanonicalpath();                  document.getfield(path);                 reader reader = new filereader(file);                 document.add(new textfield(path.tostring(), reader));                   writer.adddocument(document);              }         }          return writer.numdocs();     }      public static void search(string str) throws ioexception, parseexception {         if (str.isempty()) {             system.out.println("error :"+str.tostring());          }          file datadir = new file("c:\\users\\xxxxx\\desktop\\print_imp\\lucene");          if (!datadir.exists()) {             throw new ioexception(datadir + "does not exist or not directory");         }  //        string[] files = datadir.list(); //        for(int = 0;i< files.length;i++){ //          system.out.println(files[i].tostring()); //        }          directory tosearch = new simplefsdirectory(datadir);         indexreader indexreader = directoryreader.open(tosearch);          indexsearcher searcher = new indexsearcher(indexreader);          standardanalyzer analyzer = new standardanalyzer(luceneversion);           queryparser queryparser = new queryparser(luceneversion, "contents", analyzer);         query query = queryparser.parse(str);         topdocs td = searcher.search(query, 20);         system.out.println("number of hits: " + td.totalhits);          (int = 0; < td.totalhits; i++) {             system.out.println("doc number " + td.scoredocs[i].doc + "score :" + td.scoredocs[i].score);         }       }      public static void main(string[] args) throws exception {           file indexdir = new file("c:\\users\\xxxxx\\desktop\\print_imp");         file datadir = new file("c:\\users\\xxxxx\\desktop\\print_imp\\lucene");          if (!indexdir.exists() || !datadir.exists()) {             throw new ioexception(datadir + "does not exist or not directory");         }           //simplefsdirectory sdindexdir = new simplefsdirectory(indexdir);         simplefsdirectory sddatadir = new simplefsdirectory(datadir);          //directory dirindex = sdindexdir;         directory dirdata = sddatadir;          //long start = new date().gettime();         //int numindexed = index(indexdir, dirdata);         //long end = new date().gettime();          //system.out.println("indexed :" + numindexed + " time took index: " + (end - start) + " milliseconds");          search("algorithms");      } } 

here trying basic file directory indexing lucene 4.3.. book lucene in action. , due version changes not use code ... can 1 me out error getting ...

error

exception in thread "main" org.apache.lucene.index.indexnotfoundexception: no segments* file found in org.apache.lucene.store.simplefsdirectory@c:\<path>lockfactory=org.apache.lucene.store.nativefslockfactory@52fe85: files: [write.lock, _0.fdt, _0.fdx, _0.fnm, _0.nvd, _0.nvm, _0.si, _0_lucene41_0.doc, _0_lucene41_0.pos, _0_lucene41_0.tim, _0_lucene41_0.tip, _1.fdt, _1.fdx, _1.fnm, _1.nvd, _1.nvm, _1.si, _1_lucene41_0.doc, _1_lucene41_0.pos, _1_lucene41_0.tim, _1_lucene41_0.tip, _2.fdt, _2.fdx, _2.fnm, _2.nvd, _2.nvm, _2.si, _2_lucene41_0.doc, _2_lucene41_0.pos, _2_lucene41_0.tim, _2_lucene41_0.tip, _3.fdt, _3.fdx, _3.fnm, _3.nvd, _3.nvm, _3.si, _3_lucene41_0.doc, _3_lucene41_0.pos, _3_lucene41_0.tim, _3_lucene41_0.tip, _4.cfe, _4.cfs, _4.si, _5.cfe, _5.cfs, _5.si, _6.cfe, _6.cfs, _6.si, _7.cfe, _7.cfs, _7.si, _8.fdt, _8.fdx]     @ org.apache.lucene.index.segmentinfos$findsegmentsfile.run(segmentinfos.java:741)     @ org.apache.lucene.index.standarddirectoryreader.open(standarddirectoryreader.java:52)     @ org.apache.lucene.index.directoryreader.open(directoryreader.java:66) 

you need close writer in order commit changes!