1. Copyright © 2001 Systek ASsystek@systek.no Normal Entity Bean ClientInterfaceContainerDatabaseEntity businessMethod ejbLoad readData Transaction starts businessMethod ejbStore writeData commit Transaction ends

2. Copyright © 2001 Systek ASsystek@systek.no Exception ClientInterfaceContainerDatabaseEntity businessMethod ejbLoad readData Transaction starts businessMethod Exception discard Bean rollback

3. Copyright © 2001 Systek ASsystek@systek.no Entity2 Two Entity Beans ClientInterfaceContainerDatabaseEntity1 businessMethod ejbLoad readData businessMethod ejbStore writeData businessMethod ejbLoad ejbStore readData writeData businessMethod commit

4. Copyright © 2001 Systek ASsystek@systek.no Exception (gal oppførsel) Entity2ClientInterfaceContainerDatabaseEntity1 businessMethod ejbLoad readData businessMethod ejbStore writeData businessMethod ejbLoad readData businessMethod discard Bean Exception commit rollback

5. Copyright © 2001 Systek ASsystek@systek.no Med SessionBean Entity2ClientInterfaceContainerDatabaseEntity1 businessMethod ejbLoad readData businessMethod readData businessMethod commit Session businessMethod find... ejbLoad ejbStore writeData ejbStore writeData

6. Copyright © 2001 Systek ASsystek@systek.no Exception (riktig oppførsel) Entity2ClientInterfaceContainerDatabaseEntity1 businessMethod ejbLoad readData businessMethod readData businessMethod rollback Session businessMethod find... ejbLoad Exception

7. Copyright © 2001 Systek ASsystek@systek.no showAccount.jsp > : Account Client : CreateAccount > AccountHome HTTP POST (accuntName=...) create(accountName) ejbCreate(...) redirect Opprette konto ejbPostCreate(...)

8. Copyright © 2001 Systek ASsystek@systek.no index.jsp Overføre penger > payer : Account Client : TransferServlet > payee : Account HTTP POST processTransfer > : Transfer debit credit redirect