Why Eclipse plugin code is not able to invoke a swingworking thread from an external java swing application?

It is not easy to mix SWT and AWT/Swing UI in the same process. They require different event loops. Your code is freezing because Awt/Swing event loop is not running in the Eclipse process.

You can either re-write your UI in SWT or research SWT-AWT bridge. The bridge "works", but has numerous glitches. It is really only appropriate for situation where there is an enormous amount of AWT/Swing and a temporary solution is necessary while the UI is ported to SWT.

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