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FAQ Why do I get a 'plug-in was unable to load class' error when I activate a menu or toolbar action?

Revision as of 14:51, 14 March 2006 by Claffra (Talk | contribs)

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It is possible to get the following error message on the console:

   Could not create action delegate for id: sample.Action
      Plug-in sample was unable to load class sample.Action.

The most likely reason is that an exception was thrown in the static initializer for a class declared by the offending plug-in. Check the .log file to see whether that indeed happened. The Eclipse Platform loader will not load a plug-in when exceptions are thrown during the initialization of the Java classes that make up the plug-in. Another common reason for this error is the lack of an appropriate constructor for the class being loaded. Most classes declared in extension points must have a public zero-argument constructor. Check the extension point documentation to see what constructor is required for the classes that you declare in an extension.

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