RuntimeException boom2 = new RuntimeException("BOOM2", boom3);
        RuntimeException boom1 = new RuntimeException("BOOM1", boom2);
        boom3.initCause(boom1);

        DefaultExceptionHandler handler = new DefaultExceptionHandler();
        ExceptionSummary summary = handler.handleException(boom1);

        assertEquals("BOOM1: BOOM2: BOOM3: [CIRCULAR REFERENCE]", summary.getMessage());