.
eduardo@linux-v5bp: ~/descargas/hadoop-0.20.2/src> javac -classpath ${HADOOP_HOME}/hadoop-${HADOOP_VERSION}-core.jar -d verificatum verificatum/Verificatum.java
verificatum/Verificatum.java:8: package org.apache.hadoop.conf does not exist
import org.apache.hadoop.conf.Configuration;
                             ^
verificatum/Verificatum.java:9: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.Path;
                           ^
verificatum/Verificatum.java:10: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.IntWritable;
                           ^
verificatum/Verificatum.java:11: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.ArrayWritable;
                           ^
verificatum/Verificatum.java:12: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.Text;
                           ^
verificatum/Verificatum.java:13: package org.apache.hadoop.mapreduce does not exist
import org.apache.hadoop.mapreduce.Job;
                                  ^
verificatum/Verificatum.java:14: package org.apache.hadoop.mapreduce does not exist
import org.apache.hadoop.mapreduce.Mapper;
                                  ^
verificatum/Verificatum.java:15: package org.apache.hadoop.mapreduce does not exist
import org.apache.hadoop.mapreduce.Reducer;
                                  ^
verificatum/Verificatum.java:16: package org.apache.hadoop.mapreduce.lib.input does not exist
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
                                            ^
verificatum/Verificatum.java:17: package org.apache.hadoop.mapreduce.lib.output does not exist
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
                                             ^
verificatum/Verificatum.java:18: package org.apache.hadoop.util does not exist
import org.apache.hadoop.util.GenericOptionsParser;
                             ^
verificatum/Verificatum.java:23: cannot find symbol
symbol  : class Mapper
location: class org.verificatum.Verificatum
       extends Mapper<Object, ArrayWritable<IntWritable>, IntWritable, IntWritable>{
               ^
verificatum/Verificatum.java:23: cannot find symbol
symbol  : class ArrayWritable
location: class org.verificatum.Verificatum
       extends Mapper<Object, ArrayWritable<IntWritable>, IntWritable, IntWritable>{
                              ^
verificatum/Verificatum.java:23: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum
       extends Mapper<Object, ArrayWritable<IntWritable>, IntWritable, IntWritable>{
                                            ^
verificatum/Verificatum.java:23: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum
       extends Mapper<Object, ArrayWritable<IntWritable>, IntWritable, IntWritable>{
                                                          ^
verificatum/Verificatum.java:23: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum
       extends Mapper<Object, ArrayWritable<IntWritable>, IntWritable, IntWritable>{
                                                                       ^
verificatum/Verificatum.java:25: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum.PowMapper
    private final static IntWritable one = new IntWritable(1);
                         ^
verificatum/Verificatum.java:26: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum.PowMapper
    private IntWritable result = new IntWritable(1);
            ^
verificatum/Verificatum.java:28: cannot find symbol
symbol  : class ArrayWritable
location: class org.verificatum.Verificatum.PowMapper
    public void map(Object key, ArrayWritable<IntWritable> value, Context context
                                ^
verificatum/Verificatum.java:28: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum.PowMapper
    public void map(Object key, ArrayWritable<IntWritable> value, Context context
                                              ^
verificatum/Verificatum.java:28: cannot find symbol
symbol  : class Context
location: class org.verificatum.Verificatum.PowMapper
    public void map(Object key, ArrayWritable<IntWritable> value, Context context
                                                                  ^
verificatum/Verificatum.java:25: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum.PowMapper
    private final static IntWritable one = new IntWritable(1);
                                               ^
verificatum/Verificatum.java:26: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum.PowMapper
    private IntWritable result = new IntWritable(1);
                                     ^
verificatum/Verificatum.java:32: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum.PowMapper
        IntWritable[] valueArray = value.get();
        ^
verificatum/Verificatum.java:41: cannot find symbol
symbol  : class Configuration
location: class org.verificatum.Verificatum
    Configuration conf = new Configuration();
    ^
verificatum/Verificatum.java:41: cannot find symbol
symbol  : class Configuration
location: class org.verificatum.Verificatum
    Configuration conf = new Configuration();
                             ^
verificatum/Verificatum.java:42: cannot find symbol
symbol  : class GenericOptionsParser
location: class org.verificatum.Verificatum
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
                             ^
verificatum/Verificatum.java:47: cannot find symbol
symbol  : class Job
location: class org.verificatum.Verificatum
    Job job = new Job(conf, "verificatum");
    ^
verificatum/Verificatum.java:47: cannot find symbol
symbol  : class Job
location: class org.verificatum.Verificatum
    Job job = new Job(conf, "verificatum");
                  ^
verificatum/Verificatum.java:49: cannot find symbol
symbol  : class VerificatumMapper
location: class org.verificatum.Verificatum
    job.setMapperClass(VerificatumMapper.class);
                       ^
verificatum/Verificatum.java:52: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum
    job.setOutputKeyClass(IntWritable.class);
                          ^
verificatum/Verificatum.java:53: cannot find symbol
symbol  : class IntWritable
location: class org.verificatum.Verificatum
    job.setOutputValueClass(IntWritable.class);
                            ^
verificatum/Verificatum.java:54: cannot find symbol
symbol  : class Path
location: class org.verificatum.Verificatum
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
                                          ^
verificatum/Verificatum.java:54: cannot find symbol
symbol  : variable FileInputFormat
location: class org.verificatum.Verificatum
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    ^
verificatum/Verificatum.java:55: cannot find symbol
symbol  : class Path
location: class org.verificatum.Verificatum
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
                                            ^
verificatum/Verificatum.java:55: cannot find symbol
symbol  : variable FileOutputFormat
location: class org.verificatum.Verificatum
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    ^
36 errors