title: java.lang.ClassNotFoundException: org.apache.poi.xssf.usermodel.XSSFWorkbook
body: <p>when i tried to create a workbook in normal java class it is creating but when i tried to run the same on servlet it is throwing exceptions</p>
  
  <p>Normal java class</p>
  
  <pre><code>import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  
  import org.apache.poi.ss.usermodel.Workbook;
  import org.apache.poi.xssf.usermodel.XSSFWorkbook;
  
  
  public class Sampleclass {
  
      public static void main(String[] args) {
  
          FileInputStream file;
          try {
              file = new FileInputStream(new File("C:\\Users\\Rajasekhar\\Desktop\\EmployeeDetails.xlsx"));
              Workbook book=new XSSFWorkbook(file);
              System.out.println(book);
  
          } catch (FileNotFoundException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
      }
  
  }
  </code></pre>
  
  <p>Servlet</p>
  
  <pre><code>import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.poi.ss.usermodel.Workbook;
  import org.apache.poi.xssf.usermodel.XSSFWorkbook;
  
  
  @SuppressWarnings("serial")
  public class sampleServlet extends HttpServlet {
      @Override
      public void doGet(HttpServletRequest req, HttpServletResponse resp)
               {
          FileInputStream file;
          try {
              file = new FileInputStream(new File("C:\\Users\\Rajasekhar\\Desktop\\EmployeeDetails.xlsx"));
              Workbook book=new XSSFWorkbook(file);
  
          } catch (FileNotFoundException e) {
              System.out.println("exception occured is "+e);      
              e.printStackTrace();
          } catch (IOException e) {
              System.out.println("exception occured is "+e);      
              e.printStackTrace();
          }
      }
  
  }
  </code></pre>
  
  <p>the exception occured was </p>
  
  <pre><code>SEVERE: Servlet.service() for servlet [upload] in context with path [/Temp2] threw exception [Servlet execution threw an exception] with root cause
  java.lang.ClassNotFoundException: org.apache.poi.xssf.usermodel.XSSFWorkbook
      at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1718)
      at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
      at sampleServlet.doGet(sampleServlet.java:23)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
      at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
      at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
      at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
      at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p>I have added all required apache poi jars.</p>