Hadoop core 1.0.3 sources not found from maven project (and after manual attach)

I have a maven project with hadoop-core dependency that matches what is on apache site:

   <dependency>
   <groupId>org.apache.hadoop</groupId>
   <artifactId>hadoop-core</artifactId>
   <version>1.0.3</version>
   <exclusions>
   <exclusion>
   <artifactId>junit</artifactId>
   <groupId>junit</groupId>
   </exclusion>
   </exclusions>
   </dependency>


Now, the class files were downloaded by IJ correctly. But the source files are not.  

(1) Why is maven not able to download sources?


(2) I attached the sources manually. But still when I go to hadoop core class it says sources not found.  Why?
2 comments
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Maven is not able to download sources for "org.apache.hadoop:hadoop-core:1.0.3" because
central repository does not contain sources, see
http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.apache.hadoop%22%20AND%20a%3A%22hadoop-core%22

May be you have attached sources incorrectly. Please, take screenshot of properties of library "Maven: org.apache.hadoop:hadoop-core:1.0.3" in the Project
Structure dialog.

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I was mistaken about which jar file the code was in :  DBInputFormat is in the mapred jar not the core jar.  So this was my mistake.

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