title: hadoop - java.lang.RuntimeException: java.lang.InstantiationException
body: <p>I am trying to run a map-reduce program from client side(widows-7), this is the map-reduce class :</p>
  
  <pre><code>Configuration conf =  new Configuration();
  
      conf.addResource(new Path("C:\\app\\hadoop-2.0.0-cdh4.3.0\\etc\\hadoop\\core-site.xml"));
      conf.addResource(new Path("C:\\app\\hadoop-2.0.0-cdh4.3.0\\etc\\hadoop\\hdfs-site.xml"));
  
      conf.set("fs.defaultFS", "hdfs://host:8020");
      conf.set("mapred.job.tracker", "host:8021");
  
      Job job = new Job(conf, "mapRed");
      job.setMapperClass(MapClass.class);
      //job.setInputFormatClass(org.apache.hadoop.mapreduce.lib.input.TextInputFormat.class);
      int numreducers = 1;
  
      job.setNumReduceTasks(numreducers);
      job.setOutputKeyClass(Text.class);
      job.setOutputValueClass(Text.class);
  
      Path inp = new Path("/data/test");
      FileInputFormat.addInputPath(job, inp);
      FileOutputFormat.setOutputPath(job, new Path("/data"));
      System.exit(job.waitForCompletion(true) ? 0 : 1);
  </code></pre>
  
  <p>This program is throwing exception :</p>
  
  <pre><code>    13/12/14 08:27:52 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  Exception in thread "main" java.lang.RuntimeException: java.lang.InstantiationException
      at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:128)
      at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2307)
      at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:87)
      at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2342)
      at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2324)
      at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:351)
      at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:163)
      at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:335)
      at org.apache.hadoop.fs.Path.getFileSystem(Path.java:194)
      at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.addInputPath(FileInputFormat.java:368)
      at org.gridedge.finalytics.MRTemplate.main(MRTemplate.java:55)
  Caused by: java.lang.InstantiationException
      at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(Unknown Source)
      at java.lang.reflect.Constructor.newInstance(Unknown Source)
      at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:126)
      ... 10 more
  </code></pre>
  
  <p>I found a simlilar question asked here <a href="https://stackoverflow.com/questions/13992063/instantiationexception-in-hadoop-map-reduce-program">InstantiationException in hadoop map reduce program</a> and i changed FileInputFormat to TextInputFormat :</p>
  
  <pre><code> TextInputFormat.addInputPath(job, inp);
   TextOutputFormat.setOutputPath(job, new Path("/data"));
  </code></pre>
  
  <p>Error remains same and its thrown at line <code>FileInputFormat.addInputPath(job, inp);</code></p>