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From Zhige Xin <xinzhi...@gmail.com>
Subject Can not find hadoop packages
Date Wed, 28 May 2014 19:16:29 GMT
Hi deal all,

I tried to compile my own WordCount.java using the following command:

javac -classpath  /usr/local/Cellar/hadoop/2.2.0/libexec/share/hadoop/common/hadoop-common-2.2.0:/usr/local/Cellar/hadoop/2.2.0/libexec/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.2.0.jar:/usr/local/Cellar/hadoop/2.2.0/libexec/share/hadoop/common/lib/commons-cli-1.2.jar
-d myClasses WordCount.java

but got some errors as follows:

WordCount.java:1: error: package org.apache.hadoop.conf does not exist

import org.apache.hadoop.conf.Configuration;

                             ^

WordCount.java:2: error: package org.apache.hadoop.fs does not exist

import org.apache.hadoop.fs.Path;

                           ^

WordCount.java:3: error: package org.apache.hadoop.io does not exist

import org.apache.hadoop.io.Text;

                           ^

WordCount.java:11: error: cannot find symbol

        Configuration configuration = new Configuration();

        ^

  symbol:   class Configuration

  location: class WordCount

WordCount.java:11: error: cannot find symbol

        Configuration configuration = new Configuration();

                                          ^

  symbol:   class Configuration

  location: class WordCount

WordCount.java:14: error: cannot access Configuration

        Job job = new Job(configuration, "Word Count");

                  ^

  class file for org.apache.hadoop.conf.Configuration not found

WordCount.java:16: error: cannot find symbol

        job.setMapperClass(Map.class);

                           ^

  symbol:   class Map

  location: class WordCount

WordCount.java:17: error: cannot find symbol

        job.setReducerClass(Reduce.class);

                            ^

  symbol:   class Reduce

  location: class WordCount

WordCount.java:18: error: cannot find symbol

        job.setOutputKeyClass(Text.class);

                              ^

  symbol:   class Text

  location: class WordCount

WordCount.java:19: error: cannot find symbol

        job.setOutputValueClass(Text.class);

                                ^

  symbol:   class Text

  location: class WordCount

WordCount.java:22: error: cannot find symbol

        FileInputFormat.addInputPath(job, new Path(args[0]));

                                              ^

  symbol:   class Path

  location: class WordCount

WordCount.java:23: error: cannot find symbol

        FileOutputFormat.setOutputPath(job, new Path(args[1]));

                                                ^

  symbol:   class Path

  location: class WordCount

Note: WordCount.java uses or overrides a deprecated API.

Note: Recompile with -Xlint:deprecation for details.


12 errors



I do not why because I checked this post

http://ac31004.blogspot.com/2013/11/hadoop-2x-jar-file-location-for.html

and added the jars (hadoop-common-2.2.0, hadoop-mapreduce-client-core-2.2.0.jar and commons-cli-1.2.jar)
into my classpath but it still does not work.

Thanks!





Best,

Isaiah
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