This showed me the root of the problem ;)

import com.google.web.bindery.event.shared.UmbrellaException;
...

...
private void checkAndPrintException(Throwable ex) {
        if(ex instanceof UmbrellaException){
            LOG.debug("UMBRELLA EXCEPTION FOUND");
            UmbrellaException umbEx = (UmbrellaException)ex;
            for(Throwable t: umbEx.getCauses()){
                if(t != null){
                    checkAndPrintException(t);
                    LOG.debug("Throwable caught: " + t.getMessage());
                }
            }
        }
    }

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