DataEngine in JavaScript: Help

[Onur-Hayri Bakici]

Hey guys.

i have issues about running this code:


function sourceRequestEvent(source)
{
  print("Test");
  setData("Hello", "World");
  return true;
  
}

function updateSourceEvent(source)
{
  return true;
}

it doesnt do anything. not printing out test, nothing.
i already have plasma-scriptengines-javascript installed.

here is my metadata.desktop:

X-KDE-ServiceTypes=Plasma/DataEngine
Type=Service


X-Plasma-API=javascript
X-Plasma-MainScript=mediadataengine.js
X-Plasma-ComponentTypes=DataEngine

X-Plasma-EngineName=webmedia
X-KDE-Library=plasma_engine_webmedia
X-KDE-PluginInfo-Author=test
X-KDE-PluginInfo-Email=test at test.com
X-KDE-PluginInfo-Name=webmedia
X-KDE-PluginInfo-Version=0.1
X-KDE-PluginInfo-Website=http://plasma.kde.org/
X-KDE-PluginInfo-Category=Multimedia
X-KDE-PluginInfo-License=LGPL
X-KDE-PluginInfo-EnabledByDefault=true

i am also not quite sure, if i have the X-KDE-ServiceTypes correct, because 
the plasma-scriptengine-dataengine-javascript.desktop in
kdebase/runtime/plasma/scriptengines/javascript

thank you in advance

cheers
thehayro