title: MapReduce cannot find symbol
body: <p>I am once again asking for your technical support.</p>
  
  <p>I receive multiple "cannot find symbol errors" in my code. How can I fix that error?
  I also have problems converting variable types.</p>
  
  <p>For some of those variables, I have trying to convert them using for example: new Text(some_string_variable). Is it necessary to use the 'new' part?. Can I just call Text(some_string_variable)?</p>
  
  <pre><code>import java.io.*;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.io.*;
  import org.apache.hadoop.mapreduce.*;
  import org.apache.hadoop.util.*;
  import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
  import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
  
  
  
  
  public class mapreduce{
  
    public static class XMapper extends Mapper&lt;Object, Text, IntWritable, Text&gt;{
   //@Override
  
      //private IntWritable keys = new IntWritable();
      private Text nums = new Text();
  
      private final static IntWritable one = new IntWritable(1);
  
      public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
  
      String[] Columns = value.toString().split(",");
      String col0 = Columns[0];
      String col1 = Columns[1];
      String col2 = Columns[2];
      String col3 = Columns[3];
  
      int colInt0 = Integer.parseInt(col0);
      int colInt2 = Integer.parseInt(col2);
      double colInt3 = Double.parseDouble(col3);
  
      if(colInt0 != 0 &amp;&amp; colInt2 !=0 &amp;&amp; colInt3 !=0){
  
          nums = String.valueOf(one)+"\t"+String.valueOf(colInt3);
  
          context.write(new IntWritable(colInt0), new Text(nums));
  
  
          }
  
  
      }
  
    }
  
    public static class XReducer extends Reducer&lt;IntWritable,Text,IntWritable,Text&gt;{
      public Text tupleResult = new Text();
  
      private IntWritable result = new IntWritable();
  
      public void reduce(IntWritable key, Iterable&lt;Text&gt; values, Context context) throws IOException, InterruptedException {
          //int colKey = 0;
  
          //int colVal = 0;
          int countAll = 0;
          float sumAll = 0;
  
          for(Text val: values){
  
              StringTokenizer itr = new StringTokenizer(val.toString());
  
              int count = Integer.parseInt(itr.nextToken());
              double sum = Double.parseDouble(itr.nextToken());
  
  
  
              }
          TupleResult.set(Integer.toString(count)+','+Double.toString(sum));
          context.write(new IntWritable(key),new Text(TupleResult));
  
          }
  
  
      }
  
  
  
  
    public static void main(String[] args) throws Exception {
      Configuration conf = new Configuration();
      Job job = Job.getInstance(conf, "mapreduce");
  
      /* TODO: Needs to be implemented */
      job.setJarByClass(mapreduce.class);
      job.setMapperClass(XMapper.class);
      job.setReducerClass(XReducer.class);
      job.setOutputKeyClass(IntWritable.class);
      job.setOutputValueClass(Text.class);
  
      //
  
      FileInputFormat.addInputPath(job, new Path(args[0]));
      FileOutputFormat.setOutputPath(job, new Path(args[1]));
      System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
  }
  
  [ERROR]  mapreduce.java:[38,48] incompatible types: java.lang.String cannot be converted to org.apache.hadoop.io.Text
  [ERROR] mapreduce.java:[64,25] cannot find symbol
  [ERROR]   symbol:   class StringTokenizer
  [ERROR]   location: class mapreduce.XReducer
  [ERROR] mapreduce.java:[64,51] cannot find symbol
  [ERROR]   symbol:   class StringTokenizer
  [ERROR]   location: class mapreduce.XReducer
  [ERROR] mapreduce.java:[72,50] cannot find symbol
  [ERROR]   symbol:   variable count
  [ERROR]   location: class mapreduce.XReducer
  [ERROR] mapreduce.java:[72,77] cannot find symbol
  [ERROR]   symbol:   variable sum
  [ERROR]   location: class mapreduce.XReducer
  [ERROR] mapreduce.java:[72,17] cannot find symbol
  [ERROR]   symbol:   variable TupleResult
  [ERROR]   location: class mapreduce.XReducer
  [ERROR] mapreduce.java:[73,47] incompatible types: org.apache.hadoop.io.IntWritable cannot be converted to int
  [ERROR] mapreduce.java:[73,61] cannot find symbol
  [ERROR]   symbol:   variable TupleResult
  [ERROR]   location: class mapreduce.XReducer
  </code></pre>