Conversation with SFSB

[Lars]

In the past I implemented conversations using Servlets and manually adding / removing e.g. a Cart/Trolley object to the HttpSession object. Now I tried to implement it using JSF, Backing Bean and a Stateful EJB which is supposed to hold the data. However, that doesn work. The SFSB is created and destroyed for each request. It gives a "JBAS014101: Failed to find SFSB instance with session ID ... in cache" and later on a NPE.

How is that possible? The Backing Bean is conversationScoped and the SFSB dependant since otherwise the @Remove-method couldn't be called.

How would I implement a conversation using a SFSB? I attach the project code to this post (e.g. a "mvn clean install jboss-as:deploy" will deploy it to jboss)

Backing Bean

@Named("bookingBean")
@ConversationScoped
public class BookingBean implements Serializable {

	private static final long serialVersionUID = 4961548908512317407L;
	
	@Inject Conversation conversation;
	@Inject Trolley trolley;
	List<TableData> tableDataList = null;

	@PostConstruct
	public void init() {
		tableDataList = new ArrayList<TableData>();
		tableDataList.add(new TableData("table","12345"));
		[...]
	}

	public List<TableData> getTableData() {
		return tableDataList;
	}

	public List<TableData> getTrolleyContent() {
		List<TableData> retList = new ArrayList<TableData>();
		for (Map.Entry<String, String> entry : trolley.getOrderMap().entrySet()) {
			retList.add(new TableData(entry.getKey(), entry.getValue()));
		}
		return retList;
	}

	public String updateOrder(TableData tableData) {
		if (conversation.isTransient()) {
			conversation.begin();
		}
		trolley.updateTrolley(tableData);
		return null;
	}

	public void cancel() {
		trolley.cancelOrder();
		if (!conversation.isTransient()) {
			conversation.end();
		}
	}

	public String submit() {
		trolley.orderInfoMaterial();
		if (!conversation.isTransient()) {
			conversation.end();
		}
		return null;
	}
}

Trolley

@Stateful
@Dependent
public class Trolley {

	Map<String, String> orderMap = null;
	
	@PostConstruct
	public void initMap() {
		orderMap = new HashMap<String, String>();
	}
	
	@PreDestroy
    public void cleanup(){
    	logger.info("Trolley object destroyed");
    }

	public void updateTrolley(TableData tableData) {
		orderMap.put(tableData.getName(), tableData.getNumber());
	}

	public Map<String, String> getOrderMap() {
		return orderMap;
	}

	@Remove
	public void orderInfoMaterial() {
		logger.info("Submitting order");
	}
}