JBO-25036: An invalid object operation was invoked on type View Object...

Question

Hi,
Jdev 11.1.1.3 with BC & RC.
HR Schema - Employees & Departments Table.
In EmployeesViewImpl class overriding prepareVOForQuery() for adding dynamic where clause.
       @Override
    public void prepareVOForQuery() {
      DepartmentsViewImpl deptImpl = new DepartmentsViewImpl();
      int deptid = deptImpl.deptID();              //custom method in DepartmentsViewImpl returning deptid based on some condition
      setWhereClause("DEPARTMENT_ID = :bvdeptid");
      defineNamedWhereClauseParam("bvdeptid", null, null);
      setNamedWhereClauseParam("bvdeptid", deptid);
      super.prepareVOForQuery();
       public int deptID(){
      //return "IT_PROG";
      int int_deptid = 0;
      Row[] depts = this.getAllRowsInRange();
      for(int i=0 ; i < depts.length; i++){
        Row row = depts;
String deptname = (String)row.getAttribute("DepartmentName");
if(deptname.equalsIgnoreCase("it")){
Number deptid = (Number)row.getAttribute("DepartmentId");
int_deptid = deptid.intValue();
break;
return int_deptid;
// The error is coming
JBO-25036: An invalid object operation was invoked on type View Object with name DepartmentsViewImpl_2
Can I call a custom method deptID() like above, in EmployeesViewImpl class from DepartmentsViewImpl?
I need to change query based on some condition on page load in real scenario. I used beforePhase() but not giving perfect result.
What is best way to do this, similar to above case. However, providing plain value giving no error.
Thanks.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

Hi!
This doesn't work that way:
DepartmentsViewImpl deptImpl = new DepartmentsViewImpl();Take a look at ApplicationModule#findViewObject() if your DepartmentsView is already in your data model, executed, and you want to re-use it.
Otherwise take a look at ApplicationModule#createViewObject().
Besides that, if you want to execute a VO, then call executeQuery() on it, don't rely on other operations like first() or getAllRowsInRange() to implicitly execute it for you.
And: Why not use Number all the way through? Why the conversion to int? It will work in that example, since department ID is only NUMBER( 4 ). What if the ID column was a NUMBER( 22 )? int cannot handle that, not even close, so you should not make it a habit to convert to int.
Sascha