Re: Serialize its create method throws NullPointerException

Huub,

There is a proposal on the list to remove the serialization code. It is
quite likely that it will be removed in the next release. As an
alternative, here is a list of persistence layers that work much better

http://www.ambysoft.com/persistenceLayer.html#ProductsFromPaper

FWIW the one I use is Artem Rudoy's implementation. This can be found at
www.sourceforge.net/player

Dave

-----Original Message-----
From: pgsql-jdbc-owner(at)postgresql(dot)org
[mailto:pgsql-jdbc-owner(at)postgresql(dot)org] On Behalf Of Daems, Huub
Sent: Tuesday, November 20, 2001 1:19 PM
To: 'Barry Lind'; Daems, Huub; pgsql-jdbc(at)postgresql(dot)org
Subject: Re: [JDBC] Serialize its create method throws
NullPointerException

I needed a way to persist my data which is kept in an object with
several "data-fields". Dave has pointed me to the right direction. I
needed the latest driver jdbc7.2dev-1.2.jar. The problem I had was
solved by this new driver.

Thanks for all the help.

Greetings Huub
PS
the code below works with the new driver. Thanks Dave

SELEKTVRACHT

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> -----Original Message-----
> From: Barry Lind [SMTP:barry(at)xythos(dot)com]
> Sent: dinsdag 20 november 2001 18:34
> To: Daems, Huub; pgsql-jdbc(at)postgresql(dot)org
> Subject: Re: Serialize its create method throws
NullPointerException
>
> There are many other frameworks out there for serializing java
objects.
> The code in the postgres jdbc driver isn't very good, and will
> likely
> be removed in the next release. Depending on what you are trying to
do,
> I would start with the Java2 serialization code and store the result
in
> a bytea column.
>
> thanks,
> --Barry
>
>
>
> Daems, Huub wrote:
>
> > Hi,
> >
> > does some one has a clou how to use org.postgresql.util.Serialize to
> create
> > a table from my class....
> >
> >
> > package kermitserver.PL;
> >
> > import java.io.*;
> > import java.util.*;
> > import java.sql.*;
> > import org.postgresql.util.Serialize;
> >
> >
> > public class Jk implements Serializable {
> >
> > public int oid;
> >
> > public Jk() {
> > }
> >
> > public static void main(String[] args) {
> > Jk jk1 = new Jk();
> > jk1.oid = 0; // just in case, only for this test
> >
> > try {
> > Class.forName("org.postgresql.Driver");
> > Connection db =
> > DriverManager.getConnection("jdbc:postgresql:kermitserver", "huub",
> > "secret");
> >
> >
> > org.postgresql.util.Serialize.create((org.postgresql.Connection)db,
> jk1);
> >
> > db.close();
> >
> > } catch (ClassNotFoundException cnfe) {
> > cnfe.printStackTrace();
> > } catch (SQLException sq) {
> > sq.printStackTrace();
> > } catch (NullPointerException npe) {
> > npe.printStatckTrace();
> > }
> > }
> >
> >
> > Try to run it and it gave an NullPointerException:
> >
> > java.lang.NullPointerException
> > at org.postgresql.jdbc2.ResultSet.getString(ResultSet.java:171))
> > at org.postgresql.util.Serialize.create(Serialize.java:241)
> > at org.postgresql.util.Serialize.create(Serialize.java:220)
> > at kermitserver.PL.jk.main(jk.java:37)
> >
> > I am wondering what the ResultSet is doing.
> > I am using jdk1.3.1_01 from Sun, jdbc7.1-1.2.jar on postgresql 7.1.3
on
> SuSe
> > 7.3
> >
> > Would be nice if someone has an idea....
> >
> > greeting Huub
> >
> >
> >
> >
> >
> >
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> >
> >
>

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