javaw.exe is just the normal java webstart application.
If the updater crashes - e.g. because of a missing network connection or something - it may happen that there is no application window anymore but the updater keeps running in the background. If you now start the updater a second time, it cannot open the database (because it is still opened by the first crashed process) and it throws that exception about it. Solution is to kill the process locking the database by killing it or rebooting.
Actually it should shut down cleanly on every exception. I'll have to look why it does not when I have some spare time.
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