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Error "tridium.webuser.ui.WebUserAdminApplet" when attempting to use WebUser


The Following error is displayed when attempting to use webUI:

java.lang.ClassNotFoundException: tridium.webuser.ui.WebUserAdminApplet
  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$ Source)
  at Source)
Exception: java.lang.ClassNotFoundException: tridium.webuser.ui.WebUserAdminApplet

Product Line

TAC IA Series


  • Niagara R2
  • WorkPlace Pro 532


Some servlets which the browser uses were left out of the webUser-2.301.532.jar files.


The plan is to correct this issue in the next maintenance build release.

The workaround is to replace the current webUser-2.301.532.jars with the webUser-2.301.530a jars.

Reference How to install an I/A Series R2 JAR File.

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