title: Java Text Preprocessing and Clean-Up
body: <p>Could you please recomend me java libraries for text prerprocessing and clean up? The lib should perform such tasks:</p>
  
  <ul>
  <li>convert all verbs to infinitive</li>
  <li>convert all nouns to singular form</li>
  <li>remove useless (for the sense of a text) words</li>
  </ul>