Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
MapReduce >> mail # dev >> how to set org.apache.hadoop classpath?

Copy link to this message
Re: how to set org.apache.hadoop classpath?
The imports referenced in your error come from the hadoop-common jar,
and won't be present in the hadoop-mapreduce-client-core jar.

The most ideal way to set your compile classpath would be to rely on
the "hadoop classpath" command. Provided $HADOOP_PREFIX/bin/ is on
your $PATH, do the below:

export CLASSPATH=$(hadoop classpath)
javac WordCount.java

On Mon, Jan 27, 2014 at 1:43 PM, EdwardKing <[EMAIL PROTECTED]> wrote:
> I use hadoop-2.2.0 under CentOS-5.8,then I set JAVA_HOME ,HADOOP_HOME and CLASSPATH
> [hadoop@master ~]$ echo $JAVA_HOME
> /home/software/jdk1.7.0_02
> [hadoop@master ~]$ echo $HADOOP_HOME
> /home/software/hadoop-2.2.0
> [hadoop@master mapreduce]$ echo $CLASSPATH .:/home/software/hadoop-2.2.0/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.2.0.jar:
> I write a java file,like follows:
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.fs.Path;
> import org.apache.hadoop.io.IntWritable;
> import org.apache.hadoop.io.Text;
> public class WordCount1{
>   ...........
> }
> Then I compile this java file,but it raise following errors,like follows:
> [hadoop@master ~]$ javac WordCount1.java
> WordCount1.java:2: error: package org.apache.hadoop.conf does not exist
> import org.apache.hadoop.conf.Configuration;
>                              ^
> WordCount1.java:3: error: package org.apache.hadoop.fs does not exist
> import org.apache.hadoop.fs.Path;
> I have set hadoop-mapreduce-client-core-2.2.0.jar into CLASSPATH, why it still raise above error? Where is wrong?
> Thanks.
> ---------------------------------------------------------------------------------------------------
> Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s)
> is intended only for the use of the intended recipient and may be confidential and/or privileged of
> Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is
> not the intended recipient, unauthorized use, forwarding, printing,  storing, disclosure or copying
> is strictly prohibited, and may be unlawful.If you have received this communication in error,please
> immediately notify the sender by return e-mail, and delete the original message and all copies from
> your system. Thank you.
> ---------------------------------------------------------------------------------------------------

Harsh J