Updating a VO attribute

Question

For jdev 11g pro
Can some tell me what wrong with this code. I'm trying to update a VO attribute using the RowClass Impl of the VO.
public void modifyRefDesSpaces(ViewObject view){
while(view.hasNext()){
Table_ViewObjRowImpl row = (Table_ViewObjRowImpl) view.getCurrentRow();
String refDes = row.getRefdeshj();
String newRefDes = refDes.replaceAll(" ","&nbsp");
row.setRefdeshj(newRefDes); <-- This line cause the next line to fail
view.next(); <--- Error thrown on this line
This is the error message ...
]] Root cause of ServletException.
javax.el.ELException: oracle.jbo.PersistenceException: JBO-26035: Secondary entity usage PtdDetailView is missing parts of association description.
     at javax.el.BeanELResolver.getValue(BeanELResolver.java:266)
     at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:143)
     at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:73)
     at com.sun.el.parser.AstValue.getValue(AstValue.java:118)
     at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:192)
     Truncated. see log file for complete stacktrace
this is how the view object is set before calling the above method.
ViewObject view = service.findViewObject("Table_ViewObj1");
view.setWhereClause("PtdDetailView.EIACODXA = :project AND PtdDetailView.PCCNUMXC= :pccn");
view.defineNamedWhereClauseParam("project", null, null);
view.defineNamedWhereClauseParam("pccn", null, null);
view.setNamedWhereClauseParam("project",enterProj);
view.setNamedWhereClauseParam("pccn",enterPccn);
view.executeQuery();
modifyRefDesSpaces(view); <---- calls above method

Answer 1

I think you use the wrong approach to the problem.
I guess this is a follow up from your previous question (multiple spaces are compressed to one in the UI).
Do you really want to change the attributes permanently in the table (assuming that the VO is EO based)?
I would only change the appearance of the data for the UI. This is best done using a transient attribute in the VO. The getter method of this transient attribute gets the value from the DB and returns the modified content for the UI.
Doing it this way you don't need to iterate over the whole result set, you can just use the transient attribute in the UI (i.e. as a column in the table) and only the rows visible in the UI are changed when the transient attributes getter method is called. This also yields to a much better memory usage if your result contains many rows.
Your implementation (if you get it working) loads all rows into memory, even if they are never shown to the user.
To add a transient attribute to your VO go to the attribute secxtion of the VO and click add. Name the attribute appropriate (i.e. NameDisplay). Go to the client row interfaces, if they are not created already create them. shuffle all getter/setter methods from available to selected.
In the VORowImpl.java file search for the getter method i.e. getNameDisply() and change the implementation to
public String getNameDisplay()
    String refDes = row.getName();
    String newRefDes = refDes.replaceAll(" ","&_nbsp;"); // remove the _ before nbsp
    return newRefDes;
}Now, if you drag n drop the VO on a page you get an other attribute NameDisply which should be displayed correctly in the UI.
By the way, if you need to iterate over a result set the code looks like this:
view.executeQuery();
while (view.hasNext())
    // get a row and move the pointer to the next one to fetch
    Row row = view.next();
    // do something with the row
}Timo