Data entry's backing bean not picking up entries on form

[tonylmai]

Hello,

I have a situation where I am not sure how to debug it. Please help.

I have an entry form where entry fields are mapped to a bean as followed:

entry.xhtml

<h:inputText id="teTradeId" value="#{tradeEntry.exchTradeId}" required="true" >
...
<a4j:commandButton value="Add" action="#{tradeMgr.addTradeEntry}" reRender="tradeReportingPanel" />
...

entry bean:

@Name("tradeEntry")
@Scope(ScopeType.SESSION)
public class TdTradeEntry implements Serializable {
 private String exchTradeId;

 @NotNull
 public String getExchTradeId() ...

 public void setExchTradeId(String exchTradeId) ...

backing bean:

@Stateful
@Scope(ScopeType.SESSION)
@Name("tradeMgr")
public class TradeManagerBean implements TradeManager, Serializable {
...
 @In @Out
 private TdTradeEntry tradeEntry;

 public void addTradeEntry() {
 // tradeEntry is always null in here
 x = tradeEntry.getExchTradeId();
...
 public TdTradeEntry getTradeEntry()...

 public void setTradeEntry(TdTradeEntry tradeEntry)...

}

For whatever reason, the injection of tradeEntry is always null which Seam would throw exception as

Caused by: javax.ejb.EJBTransactionRolledbackException: org.jboss.seam.RequiredException: In attribute requires non-null value: tradeMgr.tradeEntry

If I was to declare the injection for tradeEntry with qualifier as (create=true) such as

@In(create=true) @Out private TdTradeEntry tradeEntry;

When I did this, all the fields in tradeEntry would be null.

Am I doing something wrong with this model?

Thanks for your help.
-tony

[pgmjsd]

The problem is that the injected "tradeEntry" context variable was not set before invoking the method. When you used @In(create=true), Seam instantiated the component for you and suck it in the context before injecting it into TradeManagerBean. Naturally, this calls the default constructor so all the fields are initialized accordingly: all nulls, etc.

How about having addTradeEntry() method should fill in the fields in TradeEntry?

[tonylmai]

I thought filling the fields in the backing bean was supposedly the job of Seam/JSF engine. How is it that the fields were still null after the form had been submitted?