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What Causes A Conversation ID To Be Incremented
public class ConversationIdGenerator implements Callable<String>, Serializable {

    public static final String CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME = ConversationIdGenerator.class.getName();

    private static final long serialVersionUID = 8489811313900825684L;

    // The next conversation ID
    private final AtomicInteger id;

    /**
     * Creates a new conversation ID generator
     */
    public ConversationIdGenerator() {
        this.id = new AtomicInteger(1);
    }

    public String call() {
        int nextId = id.getAndIncrement();
        return String.valueOf(nextId);
    }

}