java.lang.ClassNotFoundException: HelloWorld
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: HelloWorld

<applet code="HelloWorld" archive="{{ STATIC_URL }}HelloWorld.jar" width=525 height=635>
</applet>

ABSOLUTE_PATH = lambda x: os.path.join(os.path.abspath(os.path.dirname(__file__)), x)
STATIC_ROOT = ABSOLUTE_PATH('media/')
STATIC_URL = 'media/'

TEMPLATE_CONTEXT_PROCESSORS = (
    "django.contrib.auth.context_processors.auth",
    "django.core.context_processors.debug",
    "django.core.context_processors.i18n",
    "django.core.context_processors.media",
    "django.core.context_processors.static",
    "django.contrib.messages.context_processors.messages")

from django.template import RequestContext
...
return render_to_response(
      'empirical/empirical-outline-tool.html',
      form_data,
      context_instance=RequestContext(request)
      )

from django.contrib.staticfiles.urls import staticfiles_urlpatterns
....
urlpatterns += staticfiles_urlpatterns()