title: failed to create task or type propertyfile: Ant build
body: <p>Hi I am facing this problem while building a source using ant</p>
  
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  <p>Problem: failed to create task or type propertyfile
  Cause: the class org.apache.tools.ant.taskdefs.optional.PropertyFile was not found.
          This looks like one of Ant's optional components.
  Action: Check that the appropriate optional JAR exists in
          -/usr/share/ant/lib</p>
  
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  <p>I am not able to figure out which additional component of ant is missing i did yum install the latest ant package.</p>
  
  <p>Could some one help</p>
  
  <p>Thanks</p>