title: java.lang.ClassNotFoundException: org.apache.poi.ss.formula.udf.IndexedUDFFinder
body: <p>I was running:</p>
  
  <pre><code>Workbook workbook = new XSSFWorkbook([from a FileInputStream]);
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>java.lang.ClassNotFoundException: org.apache.poi.ss.formula.udf.IndexedUDFFinder
  </code></pre>
  
  <p>I have imported these packages:</p>
  
  <pre><code>import org.apache.poi.ss.usermodel.Workbook;
  import org.apache.poi.xssf.usermodel.XSSFWorkbook;
  </code></pre>
  
  <p>They depend on Maven pom.xml like this:</p>
  
  <pre><code>&lt;dependency&gt;
      &lt;groupId&gt;org.apache.poi&lt;/groupId&gt;
      &lt;artifactId&gt;poi-ooxml&lt;/artifactId&gt;
      &lt;version&gt;3.10-FINAL&lt;/version&gt;
  &lt;/dependency&gt;
  </code></pre>