You shouldn't execute the Camel processing in Swing's Event DispatchThread. As the EDT is busy with processing it can't repaint the JFrame. Instead run Camel processing in background thread using a SEDA and then update the JFrame using SwingUtilities invokeLater. Or you could use a SwingWorker, read http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html for more info.
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