@Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        for (final Severity severity : Severity.SEVERITIES) {
            final Set<StoredError> messages = errorMap.get(severity);
            if (messages != null) {
                for (final StoredError message : messages) {
                    sb.append(message);
                    sb.append("\n");
                }
            }
        }

        String string = sb.toString();
        string = string.replaceAll("\n+", "\n");
        return string;
    }
Stores details of warnings, errors and fatal errors.
stroom-core-client-widget/src/main/java/stroom/editor/client/view/Indicator.java