Thread: "org.hibernate.Session" ClassNotFoundException

Hello to all,

Despite I added all necessary .jar files to project, I always take boring exception warnings that say "class not found". I added the code and exception output below. I'll be so happy if someone can help me.

Thanks in advance..
With regards,
T
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		KisiHelper kh = new KisiHelper();  // ======> *Exception Warning!!!*
		try {			
			JSONArray arr = kh.getAll();
			response.getWriter().write(arr.toString());
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
---------------------------------------------------------
public class KisiHelper {
 
	public JSONArray getAll() {	
		JSONArray arr = null;
 
		try {
			System.out.println("KisiHelper calisti..");
			SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
			Session session = sessionFactory.openSession();
			Transaction transaction = session.beginTransaction();
			String hql = "from Kisi";
		    Query query = session.createQuery(hql);
		    List<Kisi> list = query.list();
			List<Kisi> kisiList = list;
		    arr = JSONArray.fromObject(kisiList);
		    transaction.commit();
		    session.close();
		} catch(Exception e) {
			e.printStackTrace();
		}
		return arr;
	}
}

----------------------------------------------------------------
*Exception:*

java.lang.ClassNotFoundException: org.hibernate.Session
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
       *at servlets.tabloDoldur.doGet(tabloDoldur.java:34)*
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
	at java.lang.Thread.run(Thread.java:619)