Error in changing row attribute value

Question

Hi,
I am using JDeveloper 11.1.1.4 and developing a project using ADF-BC.
In my application,I am displaying an adf table from DataControl->view object.
The view object is based on an entity object which has composite primary key [Ex: Name and Rank]
I have an requirement to swap selected row and its previous row's rank values on click of a button.
I have written following code to achieve this.
public void swapRows(ActionEvent actionEvent) {
ViewObject rscMapVo = getRscMapViewObj();
Row currRow = rscMapVo.getCurrentRow(); //------------->Current Row
int currRowIndex = rscMapVo.getRangeIndexOf(currRow);
Row prevRow = getRscMapVoIter().getRowSetIterator().getRowAtRangeIndex(currRowIndex - 1); // ------------> Previous Row
Long currRowRank = ((Number)currRow.getAttribute("Rank")).longValue();
Long prevRowRank = ((Number)prevRow.getAttribute("Rank")).longValue();
//Actual Swapping
prevRow.setAttribute("Rank", new Number(currRowRank));
currRow.setAttribute("Rank", new Number(prevRowRank));
adfFacesContext.addPartialTarget(tblRSCMap);
}//End of method
This is giving me the exception
1)Rank     Too many objects match the primary key oracle.jbo.Key[Group_1 7 ]. [Name is Group_1 and Rank is 7]
2)Rank     Too many objects match the primary key oracle.jbo.Key[Group_1 8 ] .[Name is Group_1 and Rank is 8]
If instead of actual rank values I update it to some random number it updates properly. i.e for example prevRow.setAttribute("Rank", new Number(900)); and currRow.setAttribute("Rank", new Number(800));
The exception occurs when I change one row value with a value that is already present in other row there by giving unique constraint problem.
How to overcome this problem??
Is there any other way of implemeting this solution.
I want the changed attribute values to commit to DB only after final commit but not immediately.
Please advice/suggest.
Thanks,
Praveen

Answer 1

Hi RajGopal,
Even in the model layer it gives the same error.
steps done
1.Create an attribute in entity and set its value
2.Override the method doDML in EntityImpl
protected void doDML(int operation, TransactionEvent e) {
try{     
if(this.getTestRank() != null){
this.setRank(this.getTestRank());
}else{
System.out.println("Test rank null");
super.doDML(operation, e);
}catch(Exception excep){
System.out.println("Eceptin in update");
excep.printStackTrace();
Exception
oracle.jbo.TooManyObjectsException: JBO-25013: Too many objects match the primary key oracle.jbo.Key[Group_1 28 ].
     at oracle.jbo.server.EntityCache.throwTooManyObjectsException(EntityCache.java:588)
     at oracle.jbo.server.EntityCache.handleDuplicateKey(EntityCache.java:596)
     at oracle.jbo.server.EntityCache.addForAltKey(EntityCache.java:990)
     at oracle.jbo.server.EntityCache.replaceForAltKey(EntityCache.java:1739)
     at oracle.jbo.server.EntityImpl.setAttributeValueInternal(EntityImpl.java:3952)
Thanks,
Praveen