Hadoop's WordCount runs form command line but not from Eclipse

Question

In the last few days, I have tested multiple version of Hadoop (1.0.1, 1.0.2, 1.1.4). In each case, I can easily run the WordCount program using the following command line: ``` hadoop jar hadoop-examples-1.1.1.jar wordcount /input output ``` Since the above command executes successfuly, then I assume that my Hadoop configuration is correct. But I get the following error message for each single version when I try to run the program using exact same input from Eclipse. Can anyone give me the reason why it wouldn't run from Eclipse? ``` Dec 12, 2012 2:19:41 PM org.apache.hadoop.util.NativeCodeLoader <clinit> WARNING: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Dec 12, 2012 2:19:41 PM org.apache.hadoop.mapred.JobClient copyAndConfigureFiles WARNING: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String). ****file:/tmp/wordcount/in Dec 12, 2012 2:19:42 PM org.apache.hadoop.mapred.JobClient$2…

Accepted Answer

Add the following two lines in your job through your Configuration abject :

```
Configuration.addResource(new Path("path-to-your-core-site.xml file"));
Configuration.addResource(new Path("path-to-your-hdfs-site.xml file"));
```

Hadoop's WordCount runs form command line but not from Eclipse

Solution

Problem