JSF-ADF // no more connection ? // database unreachable

Question

Hi,
I developed a very simple application with a list on one page, an edit form on a second and a create form on a third page. Easy. No login.
Everything seems ok but after a certain amount of time, creation and edit don't work anymore. After a while, I can still change some value in my edit form and I'm able to commit them.
But I have two fields with a validation. This validation is made with a query validation at the entity level.
After a while, the system tells me that the validation fails (on these 2 fields) because "JBO-25200: Application module is not connected to a database".
So I'm no more able to insert a new record. But I still can change et commit old ones !?
Even if I restart my brower, it doesn't work, nor on other PC. I have to reload the webapplication.
Any ideas
For information, I use
jdev 10.1.3.0.4 whith ADF 10.1.3.36 and Tomcat 5.5.20, everything on windows
but I 'm pretty sure this is not the problem.

Answer 1

Nice idea, but exactly the same error (see below)
But even in the case of a network problem, then I should not be able to update (except those fields) old records . It is the validation step at the entity level that seems to cause some problem.
Do I have to take care to some configuration parameters of the module ?
JBO-27025: Failed to validate attribute SiteId with value AUT
JBO-27014: Attribute SiteId in ModuleDeBase.DemandeVO is required
JBO-27025: Failed to validate attribute TypeDi with value LAPTOP
JBO-27014: Attribute TypeDi in ModuleDeBase.DemandeVO is required
JBO-27024: Failed to validate a row with key oracle.jbo.Key[-7 ] of type ModuleDeBase.DemandeVO
JBO-27120: SQL error during query execution. Statement: select code from ifin_lsa_code where domaine_code='SITE'
JBO-25200: Application module is not connected to a database
JBO-27120: SQL error during query execution. Statement: select code from ifin_lsa_code where domaine_code='TYPE_DI'
JBO-25200: Application module is not connected to a database
JBO-27027: Missing mandatory attributes for a row with key oracle.jbo.Key[-7 ] of type ModuleDeBase.DemandeVO