title: Apache lang3 works but Apache lang does not. Why?
body: <p>I have implemented the spring boot project with starter parent pom version 2.0.3.
  When I try to use </p>
  
  <pre><code>import org.apache.commons.lang.StringUtils
  </code></pre>
  
  <p>it throws error 
  import cannot be resolved. 
  Even though my m2 folder (C:\Users\.m2\repository\org\apache\commons) have lang package (commons-lang folder)installed.
  I also have commons-lang3 folder. If I change import to </p>
  
  <pre><code>import org.apache.commons.lang3.StringUtils
  </code></pre>
  
  <p>It works fine. </p>
  
  <p>I have same version of starter pom in other spring boot project and there I am able to use commons.lang.
  Not able to identify the root cause.</p>