Re: NullPointer at ResultSet.java:113 - Mailing list pgsql-jdbc

Hans,

I rebuilt the 7.2dev driver on the download site. Let me know if that
fixes your problem

Dave

> -----Original Message-----
> From: pgsql-jdbc-owner@postgresql.org
> [mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Hans Deragon
> Sent: Thursday, March 14, 2002 6:42 PM
> To: Dave@micro-automation.net
> Cc: 'pgsql-jdbc'
> Subject: Re: [JDBC] NullPointer at ResultSet.java:113
>
>
> Found the problem.  I do:
>
>    public static void main(String argv[]) throws Exception
>    {
>      Class.forName("org.postgresql.Driver");
>      Connection m_connection =
>        DriverManager.getConnection(DATABASEURL, USERNAME, PASSWORD);
>
>      ResultSet rs =null;
>      {
>        Statement st = m_connection.createStatement();
>        rs = st.executeQuery("SELECT * FROM stocksymbol");
>        st.close(); // <------ Problem!
>      }
>
>      System.err.println("\nHANS1" + rs);
>      rs.beforeFirst();
>      System.err.println("\nHANS1b");
>      while(rs.next())
>      {
>        System.err.println("\nHANS2\n");
>      }
>
> As you can see, the statement is closed before the ResultSet is used.
> It used to work with old Postgresql drivers, but not the most
> recent.  I
>   will simply remove the st.close() statement in my close.  I assume
> that there is a finalize() function in the Statement such
> that the close
> is done automatically when the instance is disposed.
>
> Still, it would be nice if we got a nice exception instead of a
> NullPointer exception.  Can someone correct the code to generate such
> exception?
>
> Sorry for the delay for my response. Its a pet project I am
> working on,
> on spare time.
>
>
> Sincerely,
> Hans Deragon
>
> Dave Cramer wrote:
>
> > Hans,
> >
> > Generally this means that there is nothing in the result
> set. Can you
> > give me some code which demonstrates this bug?
> >
> > Dave
> >
> > -----Original Message-----
> > From: pgsql-jdbc-owner@postgresql.org
> > [mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Hans Deragon
> > Sent: Saturday, March 09, 2002 6:13 AM
> > To: pgsql-jdbc
> > Subject: [JDBC] NullPointer at ResultSet.java:113
> >
> >
> > Greetings.
> >
> >
> >    Upgraded yesterday to the latest pgjdbc2.jar.  I am
> using JDK 1.4.0.
> >   My database is postgresql-7.1.3-2.  I get:
> >
> >          at org.postgresql.jdbc2.ResultSet.next(ResultSet.java:113)
> >          at
> marketmanager.database.StockSymbol.list(StockSymbol.java:93)
> >          at
> >
> marketmanager.datacollection.stocks.YahooCollector.fetchDataFr
> omWeb(Yaho
> > oCollector.java:56)
> >          at
> >
> marketmanager.datacollection.stocks.YahooCollector.fetchData(Y
> ahooCollec
> > tor.java:111)
> >          at
> > marketmanager.datacollection.FetchData.main(FetchData.java:13)
> >
> >    This is a bug for sure.  If there is something wrong I am doing,
> > then
> >
> > it should have been caught by an exception and report to me
> what I was
> > doing wrong.  My code works with an older version of the
> postgresql jdbc
> >
> > driver.  And my code is pretty basic.
> >
> >    I could not find on the development website the source
> of this code.
> >   Anybody can provide a pointer?  May I suggest a direct
> hyperlink to
> > the code to the development site from the
> http://jdbc.postgresql.org/?
> >
> >
> > Ciao
> > Hans
> >
> >
> >
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