Component binding setting
Hi, I am trying to understand the setting of component binding during the JSF phases. From the specification, I understand the following (JSF 1.2, Section 2.2.1) Restore View -
"For each component in the component tree, determine if a ValueExpression for “binding” is present. If so, call the setValue() method on this ValueExpression, passing the component instance on which it was found."
So, from the above, it seems that after every Restore View phase for a ViewId, setXX() for the component binding should be called. However, at runtime, I dont see this. Is my understanding correct? Excatly, when will the setXX() for the component bindings be called?
Thanks.
Hi , thanks for your response. I had done some tests, before posting my original question. Here were my observations - I had created two views View 1 and View 2. From View 1, I can navigate to View 2 and vice versa. XXX is a component binding in View 1.
Managed bean is on Pageflow Scope.
1) When View 1 is launched the first time, I see that getXXX() is called, I return null here, so, setXXX() called initializing the component. This happens in the Restore View phase of View 1.
2) Then, I navigate to View 2. Again, I see that setXXX() of View 1 is called and then View 2 is initialized. Again, this is in the Restore View phase, but that of View 2.
3) I then navigate back to View 1. I dont see any setXXX() call at this time. Why is setXXX() not called in the Restore View phase?
4) I then again navigate back to View 2. I see setXXX() again during Restore View phase of View 2.
My understanding of this is that the UIViewRoot is initialized when the View is first shown. During its initialization (createView in ViewHandler), the components are initialized and component bindings on the managed beans are set. This is done in step 1. UIViewRoot may then be stored in the session (but I dont think this is mandated by spec and probably is implementation dependent). During a subsequent postback (as in step 3), UIViewRoot is retrieved by the ViewHandler (restoreView), and setXXX() should be called here again. After this it continues on with the remaining JSF phases. RestoreView itself may retrieve UIRootView from the session, or probably build it up using the State handling mechanism - StateHolder and its cronies.
My confusion is - Why is setXXX() called during Restore View phase of View 2? At this time, it should not even bother about the UIViewRoot going out.
Thanks again for your patience explaining the finer things of ADF/JSF.
Kind regards.
Edited by: user10624779 on Oct 11, 2010 8:37 PM
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0.15: Processing point: ON_SUBMIT_BEFORE_COMPUTATION
0.15: Branch point: BEFORE_COMPUTATION
0.15: Computation point: AFTER_SUBMIT
0.15: Perform Branching for Tab Requests
0.15: Branch point: BEFORE_VALIDATION
0.15: Perform validations:
0.16: Branch point: BEFORE_PROCESSING
0.16: Processing point: AFTER_SUBMIT
0.16: ...PLSQL (AFTER_SUBMIT) INSERT INTO INDIT_PS_ORGUNIT ( OU_ID, FK_ORGUNIT, OU_NAME, OU_DESC ) VALUES ( INDIT_PASS_SEQ_GENERIC_ID.NEXTVAL, :P327_FK_ORGUNIT, :P327_OU_NAME, :P327_OU_DESC )
0.16: Show ERROR page...
0.17: Processing point: AFTER_ERROR_HEADER
0.18: Processing point: BEFORE_ERROR_FOOTER
ORA-01722: invalid number
the table was created with:
CREATE TABLE INDIT_PS_ORGUNIT (
OU_ID NUMBER(15) PRIMARY KEY,
FK_ORGUNIT NUMBER(15) NULL,
OU_NAME VARCHAR2(30) NOT NULL,
OU_DESC VARCHAR2(30) NULL,
OU_DELETED DATE NULL
what i see is that the status is "%null%" and not really "" (NULL, nothing, ...).
so what can i do to insert a null value from a select list?
i gave up RTFM. because i found nothing (NULL) ?!?!
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