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Netbeans exception class not found for javax.swing.JOptionPane


That is because of the OSGi framework being used. OSGi is a standard for modular systems where a module ("bundle" consisting of some (versioned) jars) maybe loaded in isolation with dependencies to other modules. It has a life-time management and separation of modules - realized with specific class loaders.

This is a much more strict modular system that what java offers, with visibility and versioned dependencies specified. Some features will eventually be taken into Java.

So add a bundle dependency for swing. Unfortunately I am at the moment without a NetBeans IDE to check.


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