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[protege-discussion] Plugin loading problem

Elena Pomohaci e.pomohaci at
Wed Jul 18 06:41:58 PDT 2007

Hello all!

I've developed my first plug-in for Protege. It's a tab widget plugin. I've
created the jar archive as advised in the Protege documentation and I placed
it into the Protege plugins folder. But when I open Protege, in the protege
console I get this warning:
java.lang.NoClassDefFoundError: com/hp/hpl/jena/rdf/model/Resource
     at src.OntoDiagTab.<init><>
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
     at sun.reflect.NativeConstructorAccessorImpl.newInstance (Unknown

Now, I checked the line 41 from the, and on that line I
created an instance of another class from the archive. I looked for that
class and it exists in the archive, so I cannot explain why it cannot find
it. Also, my tab is visible into Protege, but when I select it, it is empty.

Please, can anyone help me to solve this problem?

Thank you!

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