JHS-00109 Using LOV form page

Hi,
In JHeadstart version 9.0.4.5, I implemented the LOV Form Page functionality for BC4J/Struts/UIX as described in jhs_tutorial_1, and it worked perfectly.
After upgrading JHeadstart to 9.0.5.1.18, I receive the JHS-00109 (You cannot re-submit this page after using the back button, or by using the refresh button) error message when I try to submit the page which called the LOV.
Please help!
Greets,
Guido Zeelen

Guido,
A word of warning:
I understand that you switched the order of the lines
sessionData.setAttribute(LAST_ISSUED_PAGE_TIMESTAMP, currentTime, oracle.jheadstart.controller.SessionData.SESSION_SCOPE);
and
if (pageTimeStamp!=null && !pageTimeStamp.equals(""))
so that in your version LastIssuedPageTimeStamp is only updated if pageTimeStamp has a value.
Be careful with that change, because the original order was deliberate: it was needed to fix bug 3584358 (CHECKPAGETIMESTAMP DOESN'T PREVENT SUBMIT IF BACK BUTTON USED AFTER BROWSE BUTTO). From the bug text:
If you use the browse buttons (previous/next in form style layout) and then use the browser's back button to go to the previous displayed page, checkpagetimestamp does not work correctly anymore.
An example from the Oil demo:
1. Go to the Refineries select page, and edit the first one.
2. Use the > button to go to the second refinery.
3. Use the browser's back button to go back to the first refinery.
4. Update something in the values of the first record, and press Save
5. You get an error JBO-25013: Too many objects match the primary key oracle.jbo.Key[1 ]. and the browse section shows that it thinks this is row 2.
So what happened is that the values of row 1 were used to update row 2.
This bug can also result in other kinds of error messages because you try to do something for one row which is applied to another row instead.
What should happen, is that if there is no pagetimestamp in the request, CheckPageTimeStamp still updates the lastissuedpagetimestamp to note that navigation to another page has taken place. The only exception to this rule should be if an LOV is called, which should be recognizable.
A way to recognize an LOV (or more general, a page which should not cause an update of lastissuedpagetimestamp) is to submit a pagetimestamp field with the value "ignore".
In case of UIX, lov pages do not go through CheckPageTimeStamp, but in case of JSP they do. We can get JSP LOV pages to put "ignore" in pagetimestamp by changing the JSP include buttonsFindForm.jsp. This include is also used in Find pages, but it does not matter (much) if find pages also submit "ignore", because showing a find page does not change dataobjectsets.
In your case (custom made UIX LOV) it does go through CheckPageTimeStamp, so I think a better solution is to somehow make sure that a pageTimeStamp with value "ignore" is submitted. My advice is to go back to the JHeadstart version of CheckPageTimeStamp, add to your UIX LOV page (within the form that will be submitted) a line like this:
<formValue name="pageTimeStamp" value="ignore"/>
and debug what happens in CheckPageTimeStamp.
If this fixes your problem, please let us know, because then we apparently have an omission in Tutiorial 1!
kind regards,
Sandra Muller
JHeadstart Team

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