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Why do I get the error “java.lang.NoClassDefFoundError: org/eclipse/swt/internal/XXX/OS.”?

April 26, 2017Eclipse Error Internal java.lang.noclassdeffounderror org OS swt

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Why do I get the error “java.lang.NoClassDefFoundError: org/eclipse/swt/internal/XXX/OS.”?

2 Answers

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On some platforms such as GTK, SWT is broken into multiple jars. Therefore, you must ensure that all required jars are on the classpath. The required jars are: • swt.jar (all platforms) • swt-pi.jar (some platforms like GTK and Carbon) • swt-mozilla.jar (for Browser widget on GTK and Motif) • swt-gtk.

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On some platforms such as GTK, SWT is broken into multiple jars. Therefore, you must ensure that all required jars are on the classpath.