@JsonIgnore
    public Severity getSeverity() {
        Severity severity = Severity.INFO;
        for (final Message message : messageList) {
            if (message.getSeverity().greaterThan(severity)) {
                severity = message.getSeverity();
            }
        }
        return severity;
    }
This has been put here as import export API is not Serializable.
stroom-core-shared/src/main/java/stroom/importexport/shared/ImportState.java