java - Getting an unexpected error when trying to load files into a JList -

i'm trying build java-based network manager unix-based systems, ran trouble cant quite find source of:

exception in thread "main" java.lang.nullpointerexception     @ net.argvarg.networkmanual.selectconfdialog.loadconflist(selectconfdialog.java:51)     @ net.argvarg.networkmanual.selectconfdialog.<init>(selectconfdialog.java:20)     @ net.argvarg.networkmanual.main.run(main.java:16)     @ net.argvarg.networkmanual.main.main(main.java:7)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:483)     @ com.intellij.rt.execution.application.appmain.main(appmain.java:134) 

here the parts of file giving error:

package net.argvarg.networkmanual;  import javax.swing.*; import java.awt.event.*; import java.io.file;  public class selectconfdialog extends jdialog {      private defaultlistmodel conflist = new defaultlistmodel();     private jlist conflistcontainer = new jlist(conflist);     private file[] confs = new file(main.absolutepathtoconfsdir).listfiles();      private void loadconflist() {         (int = 0; < confs.length - 1; i++) {             conflist.addelement(confs[i].getname());         }     } } 

any appreciated, thank you.

based on comments above, here resolve

 private void loadconflist() {         if(confs == null || confs.length == 0){                 conflist.addelement("failed load conf.");                 return;         }//confs == null | empty          (int = 0; < confs.length - 1; i++) {             conflist.addelement(confs[i].getname());         }     }//loadconflist() 

credit goes @madprogrammer, if posts answer, mark his.