zk - what is wrong in my java zkoss program -

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updated  <?page title="example"?> <window  id="music" apply="com.main">  <combobox id="combo" autodrop="true" onchanging="music.suggest()"/>  </window> java public class main extends genericcomposer{   /**   *    */   private static final long serialversionuid = 1l;  combobox combo;  public void suggest() {   combo.getfellow("combo");    combo.getitems().clear();              combo.appenditem("ace");             combo.appenditem("ajax");             combo.appenditem("apple");              combo.appenditem("best");             combo.appenditem("blog");   }   }

it says null pointer exception y???

i modified code, can give try :)

zul

<?page title="example"?> <window  id="music" apply="com.maincomposer"> <combobox id="combo" autodrop="true"/> </window>

java

public class maincomposer extends genericforwardcomposer{   combobox combo; //zk auto wired , use combo directly   public void onchanging$combo() { // zk autoforward (awesome !!)     suggest();   }   public void suggest() {         combo.getitems().clear();     combo.appenditem("ace");     combo.appenditem("ajax");     combo.appenditem("apple");     combo.appenditem("best");     combo.appenditem("blog");   }  }

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