title: Resource leak: workbook is never closed warning when using Apache.POI XSSFWorkbook
body: <p>So, I using Apache POI in order to parse an Excel file to my Database. For this I am initializing an <code>XSSFWorkbook</code> as follows:</p>
  
  <pre><code>XSSFWorkbook workbook = new XSSFWorkbook(fIP);
  </code></pre>
  
  <p>Then I proceed with my method. <code>workbook.close()</code> is not available as a method to close the workbook afterwards. Any ideas of how can I let garbage collection take the workbook after the task is finished?</p>