Inconsistent view object result set (REPOST ... no response since 23/07/2002)

Question

(1)In JSP front-end, I have the following code:
<%
ComUtil c = new ComUtil();
String sAppConfig = c.getAppConfigStr();
%>
<jbo:ApplicationModule id="am" configname="<%=sAppConfig%>" releasemode="Stateless" />
// A datatag is put here to print out a combo box for user selection with all places defined in table
<MyTagLib:PrintSelectForAllPlaces strTagName="v_CheckPlace" strAmId="am" blnDisplayHyphen="false" />
<jbo:ReleasePageResources />
(2) The ComUtil.getAppConfigStr() code is as follows:
// Configurations parameters
String _cfPkg = "MyPkg"; // Configuration package name
String am = cfPkg + ".MyAppMod"; // Fully-qualified application module name
String _cf = "MyPkgAppModLocal"; // Configuration name for connection info
String IP_ADDR = "xxx.xxx.xx.xxx"; // x stands for number
String SID = "MySid";
String PORT = "xxx"; // x stands for number
/** Connection string used by front-end JSP for Jbo to obtain configuration name for
an application module **/
public String getAppConfigStr () {
// Create an instance of the application module by name, using local mode
String sAppConfigStr = am + "." + cf;
return sAppConfigStr;
(3) My data tag code:
public class PrintSelectForAllPlaces extends TagSupport {
public int doStartTag() {
ViewMyPlacesRowImpl r = new ViewMyPlacesRowImpl();
ComUtil c = new ComUtil();
ApplicationModuleRef amRef = Utils.getAMRefFromContext(pageContext, strAmId);
ApplicationModule am = amRef.useApplicationModule();
JspWriter out = pageContext.getOut();
try {
ViewObject vo = am.findViewObject("ViewMyPlaces");
if (vo != null) {
vo.executeQuery();
int j = 0;
out.println("<select name=" + strTagName + " " + strActionList + ">");
if (blnDisplayHyphen) {
out.println("<option value = '' selected>--</option>");
while (vo.hasNext()) {
r = (ViewMyPlacesRowImpl)vo.next();
String sPlaceCode = (String)r.getPlaceCode();
String sPlaceDesc = (String)r.getDescription();
out.print("<option value = '" + sPlaceCode + "' ");
System.out.println("sPlaceCode: " + sPlaceCode);
if (strDefaultValue != null) {
if (strDefaultValue.length() > 0) {
if (sPlaceCode.equals(strDefaultValue)) {
out.print("selected");
out.print(">");
out.print(sPlaceDesc);
out.println("</option>");
out.println("</select>");
} else {
out.println("View object not found! ");
} catch (JboException je) {
je.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
return SKIP_BODY;
My question:
- When i run my jsp, sometimes 2 rows are retrieved, sometimes 3 row are retrieved, sometimes all are retrieved, which can be simulated by 'Refreshing' the jsp page. I feel quite upset as this affects my whole application seriously. Would anyone give me any idea about my case?
(I have tried to re-make and re-compile the project; synchronizing my table structure; and also tried vo.clearCache(); but still no use. Moreover, The retrieved resultset supposed to be a reference table which will not change frequently, which means that caching is not serious affected.)
My case is quite urgent to me. In case of any ideas, please don't hesitate to let me know.
Thanks a lot for your replies!

Answer 1

Dear Shailesh, would you please give me some guidelines for how to generate diagnostic outputs for BC4J? I don't know how to run the function, which may be very helpful for debugging. ^v^
Regarding the problem I mentioned, more details are listed as follows:
1. My mentioned table has 5 rows in total.
2. My expected result set has 4 rows, which is filtered by the Query statement:
- SELECT PLACE_CODE, PLACE_DESC FROM PLACES WHERE DISPLAY_FLAG = 'Y';
3. Why I know the retrieved row is not equal because the program code line in my first post for this topic:
System.out.println("sPlaceCode: " + sPlaceCode) is embedded in the loop within while (rs.hasNext()). Sometimes the output like this:
sPlaceCode: PLACE1
sPlaceCode: PLACE2
sPlaceCode: PLACE3
Sometimes like this:
sPlaceCode: PLACE1
sPlaceCode: PLACE2
4. It is in random behavior.
The situation has been improved after I have 'Test' the BC4J view, that I have navigated all records. Then, the time of displayed all expected records has been increased. Such a mystery ... What I am feeling worried is that, I can't navigate all the time for my reference tables ~~~ besides, it still shows the same problem until now.
My Requests:
1. Please give me the guidelines for generating the diagnostic output.
2. Please help to investigate my mentioned problem.
Thanks so much for your help and replies!