regarding sql exception: invalid handle

[vivi kururu]

i have been getting this error when i run my java program.. its either i get this error unless i change part of my code but then it will not return the value to my assignated string...

SELECT HChr, count(*) AS cnt FROM Chromosome1 WHERE Zstart > 386400000 And Zend
< 388800000 GROUP BY HChr ORDER BY count(*) DESC
java.sql.SQLException: Invalid handle
count is 161 calculated value is 1361253


try {

String sqlstr3 = "SELECT HChr, count(*) AS cnt FROM "+ qchr +" WHERE Zstart > "+start+ " And Zend < " + end + " GROUP BY HChr ORDER BY count(*) DESC";

System.out.println(sqlstr3);
ResultSet rs3 = s3.executeQuery(sqlstr3);
if (rs3.next())
{
rchr = rs3.getString("HChr");

System.out.println(rchr);
}

rs3.close();
}

catch(Exception sqle)
{
System.out.println(sqle);
}