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[protege-discussion] WARNING: java.lang.NoClassDefFoundError

Tania Tudorache tudorache at
Wed Mar 5 18:01:50 PST 2008

This probably means that an old plugin makes reference to the 
_AbstractWidget class, that does not exist in the protege source code 
anymore. I think it was part of a very ancient version of Protege, but 
it has been refactored to AbstractWidget in the current versions.

If you have control over the plugin that references the old class, I 
suggest that you change the code to use the correct class name.


protege at wrote:
> I am getting this every time Protege starts.
> WARNING: java.lang.NoClassDefFoundError: edu/stanford/smi/protege/widget/_AbstractWidget -- PluginUtilities.isLoadableClass()
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