By further probing my code, I found it is actually caused by em.clear at
another component. i.e. when I select a row at dataTable, the following code is
executed:
| InvoiceContacts invoiceContactsAction = (InvoiceContacts)
Component.getInstance("invoiceContactsAction",
| ScopeType.SESSION);
| invoiceContactsAction.changeInvoice(getSelectedInvoice());
|
And code at component invoiceContactsAction is below:
| @Stateful
| @Name("invoiceContactsAction")
| @Scope(ScopeType.SESSION)
| public class InvoiceContactsAction implements InvoiceContacts {
|
| @PersistenceContext
| EntityManager em;
|
| ...
|
| public void changeInvoice(Invoice selectedInvoice) {
| this.selectedInvoice = selectedInvoice;
| tempList = null;
| invContacts = null;
| em.clear();
| }
|
| ...
| }
|
So the question turn out to be: Why does clearing the entity manager at a
component make the entity bean retrieved by another component detached under
this situation?
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