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Filip Rachunek wrote:
> Hello,
> I have a web application and when my servlets call a
> Statement.executeQuery() method, the returning ResultSet is sometimes
> null. Is that possible? I thought that even empty result sets were
> non-null objects. Or should I add a is-null check for all result sets I
> use?
> Here is the exception:
>
> java.lang.NullPointerException:
> at com.mysql.jdbc.ResultSet.next(ResultSet.java:2421)
>
>
> Thanks.
> Filip Rachunek
>
> http://BrainKing.com
In another e-mail (to me) you said that you were using the 'latest'
version? Are you absolutely sure (no old ones laying around in your
CLASSPATH or jre/lib/ext)? If you check line 2421 in ResultSet.java, it
is the following method code:
if (!reallyResult()) {
throw new java.sql.SQLException("ResultSet is from UPDATE.
No Data",
"S1000");
}
This calls the 'reallyResult()' method, which returns a boolean. There
is nowhere in this code that a NullPointerException could be thrown.
-Mark
- --
MySQL 2003 Users Conference -> http://www.mysql.com/events/uc2003/
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__ ___ ___ ____ __
/ |/ /_ __/ __/ __ \/ / Mark Matthews <mark@stripped>
/ /|_/ / // /\ \/ /_/ / /__ MySQL AB, Full-Time Developer - JDBC/Java
/_/ /_/\_, /___/\___\_\___/ Flossmoor (Chicago), IL USA
<___/ www.mysql.com
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