javabean in oracle forms calling .dll error while running oracle form

I must used javabean calling .dll file while running oracle form but it doesn't work.

here is java bean that will export to jar file.

It work while I did not have "static scapi_ope s_ope = new scapi_ope(); "

scapi_ope not only call .dll but also run exe file for it's certs.

my project include lib folder and file need to use .

public class SMC_BEAN  extends VBean{

    protected static final ID CARD_TYPEB      = ID.registerProperty("CARD_TYPEB");
    static String error_ = "";
    static scapi_ope s_ope   = new scapi_ope();  //it error while I used this line when call in oracle form.  
    private IHandler    m_handler;
      public void init(IHandler handler)
      {
        m_handler = handler;
        super.init(handler);
      }  
     public boolean setProperty(ID pId, Object Value) {
         if (pId == CARD_TYPEB){
             return true;
            }
            else {
              return super.setProperty(pId, Value);
            }
      }
     public Object getProperty(ID pId) // Get the current pressed button ID
       {
        if  (pId == CARD_TYPEB){
             return "test";
         }
         else
         {
           return super.getProperty(pId);
         }

       } 

and call dll file with this

import java.io.IOException;
import com.sun.jna.ptr.IntByReference;
public  class scapi_ope  {

    //scapi_ope s_ope = (scapi_ope)Native.loadLibrary( "scapi_ope", scapi_ope.class);   //error 
      static
      {
        //System.loadLibrary("scapi_ope"); // change to but error too  
          try {
            NativeUtils.loadLibraryFromJar("/lib/scapi_ope.dll");  // change to but error too  
        } catch (IOException e) {
            e.printStackTrace();
        }
      }
    public short ListReader(byte[] reader_list, IntByReference err_code){
        return ListReader( reader_list,  err_code);
    }
        public short CloseReader(){
        return   CloseReader();
    }
}