Entity Associations

All,
we use JDeveloper 9.0.3.10.35 with j2sdk1.4.2 on WindowsXP.
We have a very urgent problem.
We want to go into production in 4 weeks, so we need to have this solved. (In other words, PLEASEHELP_).
Here is a short decription of our situation:
1. We have 3 entities A, B and C. A&B are master entities and C is just a helper to join them.
They look like
A : A_attr0 : seq (PK)
A_attr1 : ....
B : B_attr0 : seq (PK)
B_attr1 : ....
C : C_attr0 : Seq (PK)
C_attr1 : ASeq (FK) Association with Entity A (0..1 to 1)
C_attr2 : BSeq (FK) Association with Entity B (0 ..1 to 1)
There are three possible constellations:
i) A & B are connected thru C: Then 3 entities exist with C_attr1 = A_attr0 and C_attr2 = B_attr0
ii) A is not connected to any B: Then 2 entities exist with C_attr1 = A_attr0 and C_attr2 is null
iii) B is not connected to any A: Then 2 entities exist with C_attr1 is null and C_attr2 = B_attr0
2. We have a View XView consisting of the 3 updateable entities A, B and C. Obviously A&B are outer joined to C
3. The setAttribute-methods of XViewImpl look like this:
public void setC_attr1(Number value)
System.out.println("C->A " + getC().getA());
if (getC_attr1() == null && value != null)
getC().setA(getA());
System.out.println("C->A " + getC().getA());
setAttributeInternal(C_ATTR1, value);
System.out.println("C->A " + getC().getA());
We make sure that we call this methods whenever data for A is entered (and therefore a new entity needs to be created and linked).
4. The postChanges-method of the C-entityImpl looks like this:
public void postChanges(TransactionEvent e)
System.out.println("Post Changes C");
System.out.println("C " + this);
System.out.println("A " + getA() );
System.out.println("B " + getB() );
if (null != getA())
getA().postChanges(e);
if (null != getB())
getB().postChanges(e);
return;
So we make sure that A and B (if any) are posted before C
5. If the user enters data for both entities (A & B) using that view, we automatically create a C entity that has the links set correctly.
If the user enters just data for one ( A or B ) of the entities, the respective other entity is left unused.
Scenario:
1a. The user creates a new row in XView
1b. User sets an attribute in A for the first time
Output of setC_attr1 (111111)
<--- snip --->
C->A null
C->A [oracle.jbo.Key[111111 ]]
C->A [oracle.jbo.Key[111111 ]]
<--- snip --->
1c. User sets an attribute in B for the first time
Output of setC_attr2 (222222)
<--- snip --->
C->B null
C->B [oracle.jbo.Key[222222 ]]
C->B [oracle.jbo.Key[222222 ]]
<--- snip --->
1d. User commits
Output of postChanges
<--- snip --->
Post Changes C
C [oracle.jbo.Key[333333 ]]
A [oracle.jbo.Key[111111 ]]
B [oracle.jbo.Key[222222 ]]
<--- snip --->
The data is posted, everything is fine.
2a. The user creates a new row in XView (again!)
2b. User sets an attribute in A for the first time
Output of setC_attr1 (111112)
<--- snip --->
C->A null
C->A [oracle.jbo.Key[111112 ]]
C->A [oracle.jbo.Key[111112 ]]
<--- snip --->
2c. No attributes in entity B
2d. User commits
Output of postChanges
<--- snip --->
Post Changes C
C [oracle.jbo.Key[333334 ]]
A [oracle.jbo.Key[111112 ]]
B null
<--- snip --->
The data is posted, everything is fine.
For those still reading, here's the beef!
3a. The user creates a new row in XView
3b. User sets an attribute in A for the first time
Output of setC_attr1 (111113)
<--- snip --->
C->A null
C->A [oracle.jbo.Key[111113 ]]
C->A [oracle.jbo.Key[111113 ]]
<--- snip --->
3c. User sets an attribute in B for the first time
Output of setC_attr2 (222224)
<--- snip --->
C->B null
C->B null
C->B null
<--- snip --->
3d. User commits
Output of postChanges
<--- snip --->
Post Changes C
C [oracle.jbo.Key[333333 ]]
A [oracle.jbo.Key[111111 ]]
B null
<--- snip --->
The attribute C_attr2 is set to 222224, but the entity association is not set at all.
The data cannot be posted because of database integrity constraint violations in C.C_attr2.

Hi Mike,
first of all thank you very much for reply. I know this is a very complicated case and my description maybe not the best one.
Now to your questions :
a. This is not a copy-and-paste error. I mean that if we do the same thing with case 2 between we get different results.
b. yes, my test did not include "user just creates B". But this give the same result if (and now it will be a bit more complex) the user in step 3 creates the Entity A as the first one of A and B.
Because sometimes you do not get the error due BC4J posts itself the A and B before C and so you don't get the DB error but the links between entities are not set as i described in original message.
c. Sofar i can evaluate the associations are symmetric ( I have checked all respective XML-files. Moreover the associations are generated automatically by BC4J from DB-constraints and they are symmetric too). As i said above we get the same problem if we left Entity A in setp 2 unused (just with violation of other DB constraint).
I try with a more interesting example from our code.
Situation :
Assume we are in step 3 and we left an A Entity in step 2 unused and the user enters for first time data for Entity A. Before set this attribute in Entity our EntityBaseClass sets the seq of Entity C and the seq of the Entity A
(In our super class for all entities we set all general attributes (like seq if exists, modify indicator etc.) and default values only after the user enter data for a attribute first time. So we ensure that unused entities are in PostState=INITIALIZED and will make no trouble while posting etc.
Now in the class XViewRowImpl we try to connect A and C.
<-- snip -->
AEntityImpl aFromViewRow = getA();
AEntityImpl aFromCach = ((AEntityImpl) getA().getMyEntityDef().findByPrimarykey(((XViewImpl)getViewObject()).getDBTransaction(),
new Key(new Object[] {getA().getSeq()}));
System.out.println("A from Row = " + aFromViewRow);
System.out.println("A from cach = " + aFromCach);
System.out.println("A in C = " + getC().getA());
getC().setA(aFromViewRow);
System.out.println("A in C = " + getC().getA());
<-- snip -->
The output is :
A from Row = [oracle.jbo.Key[333333 ]]
A from cach = [oracle.jbo.Key[333333 ]]
A in C = null
A in C = null
we observe that after call getC().setA(aFromViewRow) the FK attribute of C is set to PK attribute of A (i.e. 333333 ) but if you ask the entity about his A it returns with null!!! and this cause the exception in postChanges cycle because the postchanges() of C relies on correct links between entities if the Fks are set.
I think it must be related to the unused entity in step 2. As you saw above the EntityCach can find the new Entity A but the entity C can not.
Actually we have the same problem if we only do step 2 and 3. I just added the step 1 to prevent someboby may think we may have general problems setting all three entities.
We can repeat step 1 n-times without any error.
we can repeat step 2 n-times without any error.
Once you left one entity (A or B) in previous step unused you can not set the new one in C in next step.
Additionally i must say that in a test case i reexcute XView after step 2 (just to see what happens) but got the same error.
I fear that this message is not less complex than the first one but i hope it helps a little bit more
Thanks in advance
Masoud

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Entity with key:oracle.jbo.Key[ XXXXXXX ] cannot be owned by another row:oracle.jbo.Key[ XXXXXXX ]
Code -
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Copying from [http://www.packtpub.com/oracle-application-development-framework-real-world-developers-guide/book|Oracle ADF Real World Developers Guide]
Creating child rows in composition association
Creating a new child row is a bit tricky when the master-child entity association
type is composition. When you mark an association between master and child entity
objects as composition, the framework takes the necessary steps to ensure that the
child entity object row does not exist without the master entity row. If you try to
create a new child row by calling createRow() on the view object, the framework
will throw the oracle.jbo.InvalidOwnerException: JBO-25030: Failed to
find or invalidate owning entity exception.
There are two possible ways to create child entity rows in this case:
• Find the master row by using findByKey() or calling executeQuery() with
a proper condition and then get the RowIterator for the child collection
by accessing the view link accessor attribute. Now you can use the child
RowIterator to call createRow() for creating the child row. The following
code snippet illustrates the creation of the child entity row for the
Country-Location composition association:
//In application module implementation class
* This custom method defined in application module
* creates child location rows for a master
* country entity through accessor iterator
public void createChildRowsThruIter() {
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Key key = new Key(new Object[] { "IN" });
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//Access the RowIterator for Location
RowIterator locIter = (RowIterator)rows[0].
getAttribute("LocationVO");
//Create and init location row
Row row = locIter.createRow();
row.setAttribute("LocationId", 2200);
row.setAttribute("City", "Bangalore");
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• Alternatively, you can directly create a new row in the child view object,
using createAndInitRow() by passing an appropriately constructed instance
of oracle.jbo.NameValuePairs, which includes the foreign key attribute
that provides the context for a child row. Here is an example:
//In application module implementation class
* This custom method defined in application module
* creates child location rows for a master
* country entity using createAndInitRow()
public void createChildRowsThruNameValuePairs() {
ViewObject locations = findViewObject("Locations");
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String[] attributes = new String[] { "CountryId" };
Object[] values = new Object[] { "IN" };
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Error Message Help please

I get this when trying to get an appMod, any clues?
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I get this when trying to get an appMod, any clues?
JBO-29000: Unexpected exception caught: oracle.jbo.common.ampool.ApplicationPoolException, msg=JBO-30003: The application pool (fsweb.jbo.account.AccountModule) failed to checkout an application module due to the following exception:
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Problem in Deploying ADF Application - development Mode

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i have jdev11.1.1.5.0 in a combination with weblogic 10.3.5.
my application is working fine, while running on integrated wls (just give right click and on my jspx page - auto deploying).
if i going with manually deploying option on same intergrated wls or standalone wls means
i can able to get my login page, if i login means it doesnt re-direct to my index page what it would be problem? (it doent replicate this kind of intergrated wls (auto deploying))
Details of my Application
am not using any adf security. my login page is in session scoped bean , index page - backing bean scoped.
my log shows, your username and password is correct. that means it can able to access my Application Module.
am using adfc - config for redirecting
<control-flow-rule id="__5">
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i maked out sample for deplying an adf application in both Integrated wls and standlone wls. it's fine.
can anyone guide me where am?
any one had a idea?
while am deploying manually i got dialog "deployment configuration" to deploy.
i got this in my log.
[01:07:44 PM] Entering Oracle Deployment Plan Editor
[01:07:46 PM] No metadata repositories found on target server. Using values found in adf-config.xml. //show this red collor

+ info,
sometimes, i had another problem while login
if i go with manual deployment on integrated wls/ standlone wls
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i checked the myApplicationModule.xml no warning on right hand gutter. so what would be the problem.?
somtimes i had this? how can i fix this?
cant come to conclusion? with to two different problem in same project.

Approach to designing model layer

Hi,
I am keen to understand different approaches/routes to be followed to design model layer of an ADF project.
As an example, the embedded URL shows the logical hierarchy strucutre of various business modules -
http://www.slideshare.net/AnkitGupta55/hierarchy-23178558
The logical structure will govern how the data will be shown to the user based on his selection of a value of in a top level LOV/Query component.
For Ex: if the user choose Child 1, then he should be able to see hierarchy : Main > Child 1 > Sub child 1
Every module in the diagram has a backend supporting table, however, the tables may not have the similar relationships. So a follow up query would be - Is it mandatory to have an identical table relationships as depicted in the diagram.
Also, request you to share suggestions on designing Entity Objects, View Objects etc.
JDeveloper Version - 11.1.2.4.39.64.36.1
Best Regards,
Ankit Gupta

Hi,
Every module in the diagram has a backend supporting table, however, the tables may not have the similar relationships
What do you refer to as module? The blocks as I see them can be treated as entities with associated VO. The relation between the two can be defined using entity associations or view links. Unfortunately its not easy to answer your question without knowing what you do know and what you don't know about ADF BC. Have you tried ADF (e..g running a tutorial) or have you only theoretical experience with the product. If you write ....
request you to share suggestions on designing Entity Objects, View Objects etc.
What exactly are you looking for and what does "etc." stand for in regards to the technology aspect it would represent? Entities and VO can be derived from an existing database infrastructure. If you don't have this, starting with teh ADF BC Diagrammer is a good way to start with. All documentation are accessible from otn.oracle.com/products/jdev
Frank

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vo1 ->vl (1 to 1) - > vo2
->vl ( 1 to many) -> vo3
Any search attribute which is not from vo1 return bad result. It happens in running app module and in the jspx page. In app module, it sometimes complains about populating the wrong attribute for the named criteria.
The search criteria is using "exists" statement for vo2 and vo3 for adding the conditions. It has many attributes within the exist statement.
So what is the problem. Why it does not join properly? Why does it return bad result when search attribute is from vo2 and vo3? Please help.
Any more information requires to solve the problem?
Thanks,
Arthur

Hi,
Two more information: vo1 is composed of Entity1 (1..M) Entity2 and Entity1 (1..1) Entity 3. vo2 is composed of Entity 2 and vo3 is composed of Entity 4.
I follow the information from http://download.oracle.com/docs/cd/E16162_01/web.1112/e16182/bcquerying.htm#BCGIFHHF
to create the search criteria.
Arthur

Entity Associations

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