java - getChildNodes() on org.w3c.dom.Node returns NodeLits of only nulls -

i'm trying parse configuration file, when call getchildnodes() on node excludes, returned nodelist contains 7 null values , nothing else.

my code:

public class minnull {  private static final list<string> excludes = new arraylist<>();  public static void main(string[] args) throws parserconfigurationexception, saxexception, ioexception {     file cfgfile = new file("ver.cfg");     documentbuilderfactory dbf = documentbuilderfactory.newinstance();     documentbuilder db = dbf.newdocumentbuilder();     document doc = db.parse(cfgfile);     element rootelement = doc.getdocumentelement();     nodelist cfg = rootelement.getchildnodes();     parseconfig(cfg); }  private static void parseconfig(nodelist cfg) {     (int = 0; < cfg.getlength(); i++) {         node node = cfg.item(i);         string name = node.getnodename();         switch (name) {             case "excludes":                 nodelist exc = node.getchildnodes();                 for(int j = 0; j < exc.getlength();j++){                     node ex = exc.item(i);                     system.out.println(ex);                     if(ex != null && ex.getnodename().equals("file")){                         excludes.add(ex.gettextcontent());                     }                 }                 break;         }     } } } 

my xml file (named ver.cfg) :

<?xml version="1.0" encoding="utf-8"?>  <root>     <server>localhost</server>     <port>6645</port>     <project>myapp</project>     <mainfile>myapp.jar</mainfile>     <version>v1</version>     <excludes>         <file>launcher.jar</file>         <file>launch.bat</file>         <file>ver.cfg</file>     </excludes> </root> 

output:

null null null null null null null 

everything else working correctly.

you use wrong index variable in

node ex = exc.item(i); 

you should have used j here.

at point i = 5, , child node 5 not exists, getting null indicating that node not exists.