title: Error: no classes specified
body: <p>I wrote this Java hadoop program which will execute parallel indexation of files.The file was created in eclipse</p>
  
  <pre><code>package org.myorg;
  
  import java.io.*;
  import java.util.*;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.conf.*;
  import org.apache.hadoop.io.*;
  import org.apache.hadoop.mapred.*;
  import org.apache.hadoop.util.*;
  
  public class ParallelIndexation {
  
  
  public static class Map extends MapReduceBase implements Mapper&lt;LongWritable, Text, Text, IntWritable&gt; { 
       private final static IntWritable zero = new IntWritable(0); 
       private Text word = new Text();
       public void map(LongWritable key, Text value, OutputCollector&lt;Text, IntWritable&gt; output, Reporter reporter) throws IOException { 
          String line = value.toString();
          int CountComputers;
          //DataInputStream ConfigFile = new DataInputStream( new FileInputStream("countcomputers.txt"));
          FileInputStream fstream = new FileInputStream("/usr/countcomputers.txt"); // путь к файлу
          DataInputStream in = new DataInputStream(fstream);
          BufferedReader br = new BufferedReader(new InputStreamReader(in));
          String result = br.readLine(); // читаем как строку
          CountComputers = Integer.parseInt(result); // переводим строку в число
          //CountComputers=ConfigFile.readInt();
          in.close();
          fstream.close();
          ArrayList&lt;String&gt; paths = new ArrayList&lt;String&gt;();
          StringTokenizer tokenizer = new StringTokenizer(line, "\n");
          while (tokenizer.hasMoreTokens()) 
          {
            paths.add(tokenizer.nextToken());
          }
          String[] ConcatPaths= new String[CountComputers];
          int NumberOfElementConcatPaths=0;
          if (paths.size()%CountComputers==0)
          {
              for (int i=0; i&lt;CountComputers; i++)
              {
                  ConcatPaths[i]=paths.get(NumberOfElementConcatPaths);
                  NumberOfElementConcatPaths+=paths.size()/CountComputers;
                  for (int j=1; j&lt;paths.size()/CountComputers; j++)
                  {
                      ConcatPaths[i]+="\n"+paths.get(i*paths.size()/CountComputers+j);
                  }
              }
          }
          else
          {
              NumberOfElementConcatPaths=0;
              for (int i=0; i&lt;paths.size()%CountComputers; i++)
              {
                  ConcatPaths[i]=paths.get(NumberOfElementConcatPaths);
                  NumberOfElementConcatPaths+=paths.size()/CountComputers+1;              
                  for (int j=1; j&lt;paths.size()/CountComputers+1; j++)
                  {
                      ConcatPaths[i]+="\n"+paths.get(i*(paths.size()/CountComputers+1)+j);
                  }           
              }
              for (int k=paths.size()%CountComputers; k&lt;CountComputers; k++)
              {
                  ConcatPaths[k]=paths.get(NumberOfElementConcatPaths);
                  NumberOfElementConcatPaths+=paths.size()/CountComputers;                
                  for (int j=1; j&lt;paths.size()/CountComputers; j++)
                  {
                      ConcatPaths[k]+="\n"+paths.get((k-paths.size()%CountComputers)*paths.size()/CountComputers+paths.size()%CountComputers*(paths.size()/CountComputers+1)+j);
                  }                   
              }
          }
          //CountComputers=ConfigFile.readInt();
          for (int i=0; i&lt;ConcatPaths.length; i++)
          {
              word.set(ConcatPaths[i]);
              output.collect(word, zero);
          }
       }
  }
  
  
  
  public static class Reduce extends MapReduceBase implements Reducer&lt;Text, IntWritable, Text, LongWritable&gt; { 
      public native long Traveser(String Path);
      public native void Configure(String Path);
      public void reduce(Text key, &lt;Iterator&gt;IntWritable value, OutputCollector&lt;Text, LongWritable&gt; output, Reporter reporter) throws IOException { 
          long count;
          String line = key.toString();
          ArrayList&lt;String&gt; ProcessedPaths = new ArrayList&lt;String&gt;();
          StringTokenizer tokenizer = new StringTokenizer(line, "\n");
          while (tokenizer.hasMoreTokens()) 
          {
            ProcessedPaths.add(tokenizer.nextToken());
          }       
          Configure("/etc/nsindexer.conf");
          for (int i=0; i&lt;ProcessedPaths.size(); i++)
          {
              count=Traveser(ProcessedPaths.get(i));
          }
          output.collect(key, new LongWritable(count));
        }
      static
      {
          System.loadLibrary("nativelib");
      } 
  }
  
  public static void main(String[] args) throws Exception { 
        JobConf conf = new JobConf(ParallelIndexation.class); 
        conf.setJobName("parallelindexation");
        conf.setOutputKeyClass(Text.class);
        conf.setOutputValueClass(LongWritable.class);
        conf.setMapperClass(Map.class);
        conf.setCombinerClass(Reduce.class);
        conf.setReducerClass(Reduce.class);
        conf.setInputFormat(TextInputFormat.class);
        conf.setOutputFormat(TextOutputFormat.class);
        FileInputFormat.setInputPaths(conf, new Path(args[0]));
        FileOutputFormat.setOutputPath(conf, new Path(args[1]));
        JobClient.runJob(conf);
    } 
  }
  </code></pre>
  
  <p>I compiled the program by means of a command</p>
  
  <pre><code>javac -classpath /export/hadoop-1.0.1/hadoop-core-1.0.1.jar -d folder/classes folder/src/ParallelIndexation.java,
  root@one:/export/hadoop-1.0.1/folder/classes# jar -cvf ParallelIndexation.jar -C /export/hadoop-1.0.1/folder/classes
  </code></pre>
  
  <p>Then for native methods I tried to create the .h file</p>
  
  <pre><code>root@one:/export/hadoop-1.0.1/folder/classes# javah -classpath /export/hadoop-1.0.1/hadoop-core-1.0.1.jar;/export/hadoop-1.0.1/folder/classes/ParallelIndexation.jar -jni org.myorg.ParallelIndexation
  </code></pre>
  
  <p>received the following mistake</p>
  
  <pre><code>Error: no classes specified
  bash: /export/hadoop-1.0.1/folder/classes/ParallelIndexation.jar: Permission denied
  </code></pre>
  
  <p>thus on ParallelIndexation.jar the rights 0777 are set</p>