设置类路径后包 org.apache.hadoop.conf 不存在 [英] package org.apache.hadoop.conf does not exist after setting classpath

问题描述

我是 hadoop 的初学者，使用 hadoop 的初学者指南作为教程.

I am a beginner in hadoop using the hadoop's beginners guide book as a tutorial.

我使用的是 mac osx 10.9.2 和 hadoop 版本 1.2.1

I am using a mac osx 10.9.2 and hadoop version 1.2.1

当我在终端中调用 echo $PATH 时，我已经设置了所有适当的类路径:

I have set all the appropriate class path, when I call echo $PATH in terminal:

这是我得到的结果:

/Library/Frameworks/Python.framework/Versions/2.7/bin:/Users/oladotunopasina/hadoop-1.2.1/hadoop-core-1.2.1.jar:/Users/oladotunopasina/hadoop-1.2.1/bin:/usr/share/grails/bin:/usr/share/groovy/bin:/Users/oladotunopasina/.rvm/gems/ruby-2.1.1/bin:/Users/oladotunopasina/.rvm/gems/ruby-2.1.1@global/bin:/Users/oladotunopasina/.rvm/rubies/ruby-2.1.1/bin:/usr/local/heroku/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Users/oladotunopasina/.rvm/bin:/Users/oladotunopasina/.rvm/bin

/Library/Frameworks/Python.framework/Versions/2.7/bin:/Users/oladotunopasina/hadoop-1.2.1/hadoop-core-1.2.1.jar:/Users/oladotunopasina/hadoop-1.2.1/bin:/usr/share/grails/bin:/usr/share/groovy/bin:/Users/oladotunopasina/.rvm/gems/ruby-2.1.1/bin:/Users/oladotunopasina/.rvm/gems/ruby-2.1.1@global/bin:/Users/oladotunopasina/.rvm/rubies/ruby-2.1.1/bin:/usr/local/heroku/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Users/oladotunopasina/.rvm/bin:/Users/oladotunopasina/.rvm/bin

我尝试编译 WordCount1.java，但出现以下错误:

I tried compiling WordCount1.java and I am getting the following error:

WordCount1.java:2: package org.apache.hadoop.conf does not exist
import org.apache.hadoop.conf.Configuration ;
                         ^
WordCount1.java:3: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.Path;
                       ^
WordCount1.java:4: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.IntWritable;
                       ^
WordCount1.java:5: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.Text;
                       ^
WordCount1.java:6: package org.apache.hadoop.mapreduce does not exist
import org.apache.hadoop.mapreduce.Job;
                              ^
WordCount1.java:7: package org.apache.hadoop.mapreduce does not exist
import org.apache.hadoop.mapreduce.Mapper;
                              ^

请帮忙.

推荐答案

CLASSPATH 变量是告诉应用程序(包括 JDK 工具 (javac))到何处查找用户类的方式.

The CLASSPATH variable is the way to tell applications, including the JDK tools(javac), where to look for user classes.

您可以如下设置此变量并尝试编译该类.

You can set this variable as given below and try compiling the class.

export CLASSPATH=$CLASSPATH:/Users/oladotunopasina/hadoop-1.2.1/hadoop-core-1.2.1.jar

这篇关于设置类路径后包 org.apache.hadoop.conf 不存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！