Error:  500 
Location: /main.jsp
Internal Servlet Error:

java.lang.VerifyError: ( class : ukr_sait/retpage, method: doPost signature: (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V) Incompatible object argument  for  function call
	at java.lang. Class .getDeclaredConstructors0( Native  Method)
	at java.lang. Class .privateGetDeclaredConstructors( Class .java: 2328 )
	at java.lang. Class .getConstructor0( Class .java: 2640 )
	at java.lang. Class .newInstance0( Class .java: 321 )
	at java.lang. Class .newInstance( Class .java: 303 )
	at org.apache.tomcat.facade.ServletHandler.getServlet(ServletHandler.java: 346 )
	at org.apache.tomcat.facade.ServletHandler.preInit(ServletHandler.java: 439 )
	at org.apache.tomcat.facade.ServletHandler.init(ServletHandler.java: 228 )
	at org.apache.tomcat.facade.ServletHandler.service(ServletHandler.java: 472 )
	at org.apache.tomcat.facade.RequestDispatcherImpl.doInclude(RequestDispatcherImpl.java: 402 )
	at org.apache.tomcat.facade.RequestDispatcherImpl.include(RequestDispatcherImpl.java: 189 )
	at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java: 413 )
	at main_20._jspService(main_20.java: 126 )
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java: 119 )
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at org.apache.tomcat.facade.ServletHandler.doService(ServletHandler.java: 574 )
	at org.apache.tomcat.core.Handler.invoke(Handler.java: 322 )
	at org.apache.tomcat.core.Handler.service(Handler.java: 235 )
	at org.apache.tomcat.facade.ServletHandler.service(ServletHandler.java: 485 )
	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java: 917 )
	at org.apache.tomcat.core.ContextManager.service(ContextManager.java: 833 )
	at org.apache.tomcat.modules.server.Http10Interceptor.processConnection(Http10Interceptor.java: 176 )
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java: 494 )
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java: 516 )
	at java.lang.Thread.run(Thread.java: 595 )

  public   void  doPost(HttpServletRequest request, HttpServletResponse response)  throws  ServletException, IOException {
            System.out.println("in the post");
            par_name=(String)request.getSession().getAttribute("p");
              response.setContentType(CONTENT_TYPE);
              PrintWriter out = response.getWriter();
         if (par_name.equals("all")){
            con= new  ConnectBD();
           if (con.getConnection()== null ){
              out.print("<p align=center>Attention: "+con.getLog());
              out.close();
               return ;
           }
          con.execute("select aviatrans.id_zajavki, aviatrans.nepoladka, aviatrans.komnata, aviatrans.status, aviatrans.master, aviatrans.data, aviatrans.depart, aviatrans.data_ok, aviatrans.opis_nep from aviatrans ORDER BY data");
            out.print("<table border=1 width=100%>");
                   out.print("<tr>");
                for ( int  i= 0 ;i<head.length;i++){
                out.print("<td bgcolor=#DBDBDB>"+head[i]+"</td>");
                       }
                   out.print("</tr>");
             for ( int  i= 0 ;i<con.getStroki();i++){
                Vector v=(Vector)con.getResultExecute().elementAt(i);
                    out.print("<tr>");
                 for ( int  j= 0 ;j<con.getColumnCount();j++){
                    out.println("<td>"+v.elementAt(j)+"</td>");
                      }
                    out.print("</tr>");
            }
                    out.print("</table>");
        } else   if (par_name.equals("add")){
           out.println("<table border=1 width=100%>");
               out.println("<tr>");
                  out.println("<td>");
                  out.println("</td>");
               out.println("</tr>");
           out.println("</table>");
        }
               out.close();
                try {
                con.getConnection().close();
                   } catch (Exception r){
                     System.out.println("exc:"+r.toString());
             }

Error:  500 
Location: /retpage
Internal Servlet Error:

java.lang.VerifyError: ( class : ukr_sait/retpage, method: doGet signature: (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V) Incompatible object argument  for  function call
	at java.lang. Class .getDeclaredConstructors0( Native  Method)
	at java.lang. Class .privateGetDeclaredConstructors( Class .java: 2328 )
	at java.lang. Class .getConstructor0( Class .java: 2640 )
	at java.lang. Class .newInstance0( Class .java: 321 )
	at java.lang. Class .newInstance( Class .java: 303 )
	at org.apache.tomcat.facade.ServletHandler.getServlet(ServletHandler.java: 346 )
	at org.apache.tomcat.facade.ServletHandler.preInit(ServletHandler.java: 439 )
	at org.apache.tomcat.facade.ServletHandler.init(ServletHandler.java: 228 )
	at org.apache.tomcat.facade.ServletHandler.service(ServletHandler.java: 472 )
	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java: 917 )
	at org.apache.tomcat.core.ContextManager.service(ContextManager.java: 833 )
	at org.apache.tomcat.modules.server.Http10Interceptor.processConnection(Http10Interceptor.java: 176 )
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java: 494 )
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java: 516 )
	at java.lang.Thread.run(Thread.java: 595 )