title: package org.apache.commons.io does not exist error
body: <p>I am compiling a .java file using ant compiler. I am getting the following errror
  "package org.apache.commons.io does not exist error"</p>
  
  <p>I downloaded the apache Commons IO binaries and pasted the .jar files in 
  "C:\Program Files\Java\jdk1.7.0_51\lib\missioncontrol\plugins "</p>
  
  <p>Any help. Do I need to modify the classpath of my build xml file?</p>
  
  <pre><code>&lt;target name="compile" description="Compile source code"&gt;
  &lt;mkdir dir="${build.dir}/classes"/&gt;
   &lt;javac includeantruntime="false"
      srcdir="src"
         destdir="${build.dir}/classes"
         classpathref="classpath"
         encoding="UTF8"
         debug="on"
         deprecation="on"&gt;
    &lt;include name="**/*.java"/&gt;
    &lt;exclude name="**/NutchExample.java"/&gt;
   &lt;/javac&gt;
  
   &lt;copy todir="${build.dir}/classes/lia/tools"&gt;
     &lt;fileset dir="src/lia/tools" excludes="**/*.java"/&gt;
   &lt;/copy&gt;
  &lt;/target&gt;
  </code></pre>