[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2811) ScrollableResults.next() generates Exception when no records were found and ScrollMode.FORWARD_ONLY is used

[Simon Jongsma (JIRA)]

ScrollableResults.next() generates Exception when no records were found and ScrollMode.FORWARD_ONLY is used
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                 Key: HHH-2811
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2811
             Project: Hibernate3
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.0.ga
         Environment: Oracle database  9.2.0.5.0; Oracle jdbc driver 10.2.0.2.0; JBoss 4.0.4.GA; Hibernate 3.2.0.ga
            Reporter: Simon Jongsma


When using ScrollableResults with ScrollMode.FORWARD_ONLY 
i could not locate a way to test (without triggering an exception) if there are any records found.

If the set is empty the next() function generates (on first call) a 
GenericJDBCException: "could not perform sequential read of results (forward)".
It should return the boolean false value instead.

When there are data found the next() function will work ok & 
also will correctly return false when reaching the end of the set.

A workaround (kludge) is to catch the Exception like this:

ScrollableResults foundRecs = query.scroll(ScrollMode.FORWARD_ONLY); 
try {
	boolean found = foundRecs.next();
} catch (GenericJDBCException e) { 
	   if (e.getMessage().equalsIgnoreCase("could not perform sequential read of results (forward)")) {
	     found = false;}
	   else throw new DatabaseException(e.getMessage(), e);
}	
if (found) ....

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