title: what give java.lang.NoClassDefFoundError?
body: <p>I want to read excel file but give  </p>
  
  <pre><code>    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xmlbeans/XmlObject
   at ExcelReader.main(ExcelReader.java:32)
  Caused by: java.lang.ClassNotFoundException: org.apache.xmlbeans.XmlObject
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  ... 1 more
  </code></pre>
  
  <p>please help me.
  At first open .xlsx file and then give the first sheet.
  at the end print data of excel file on console.
  Ps : I add poi-ooxml-3.9-20121203.jar to my project.</p>
  
  <pre><code>    import java.io.File;
      import java.io.FileInputStream;
      import javax.swing.text.html.HTMLDocument.Iterator;
      import org.apache.poi.hssf.usermodel.HSSFSheet;
      import org.apache.poi.hssf.usermodel.HSSFWorkbook;
      import org.apache.poi.ss.usermodel.Cell;
      import org.apache.poi.ss.usermodel.Row;
      import org.apache.poi.xssf.usermodel.XSSFSheet;
      import java.util.*;
      import org.apache.poi.xssf.usermodel.XSSFWorkbook;
      /**
       * @author mohammad hosein
      *
      */
      public class ExcelReader {
  
  /**
   * @param args
   */
  public static void main(String[] args) {
      try
      {
      FileInputStream file = new FileInputStream(new File("E:\\test.xlsx"));
  
      //Get the workbook instance for XLS file 
      XSSFWorkbook workbook = new XSSFWorkbook (file);
  
      //Get first sheet from the workbook
      XSSFSheet sheet = workbook.getSheetAt(0);
  
      //Get iterator to all the rows in current sheet
      java.util.Iterator&lt;Row&gt; rowIterator = sheet.iterator();
  
      while(rowIterator.hasNext())
      {
          Row row = rowIterator.next();
          java.util.Iterator&lt;Cell&gt; cellIterator = row.cellIterator();
  
          while(cellIterator.hasNext())
          {
              Cell cell = cellIterator.next();
              System.out.print(cell.getStringCellValue() + "\t");
          }
          System.out.println("");
      }
      }
      catch(Exception e)
      {
          System.out.println("EROR!");
      }
  
      //Get iterator to all cells of current row
  
  }
  </code></pre>
  
  <p>}</p>