Error Using Sequence in Weblogic

Question

I tried to use Sequence object in weblogic to generate auto-imcremental integers
for my db insert keys. I first create a mydbsequece in oracle database. Then,
I built a class in which I obtain a dataSource using jndi to look for my dataSource.
And then use the ds to getConnection. After I had the connection, I do the following:
Sequence sequence = new Sequence(con, "mydbsequence");
int i = sequence.nextValue();
When I call sequence.nextValue() method, I got the following error message: NullPointerException
at Weblogic.jdbc.rmi.SerialConnection.createStatement(SerialConnection.java:65).
Does anyone know what causes this error? and How do I fix it? Please advise me
on this. Thank you very much.
Qin

Answer 1

Qin Ding wrote:
>
I tried to use Sequence object in weblogic to generate auto-imcremental integers
for my db insert keys. I first create a mydbsequece in oracle database. Then,
I built a class in which I obtain a dataSource using jndi to look for my dataSource.
And then use the ds to getConnection. After I had the connection, I do the following:
Sequence sequence = new Sequence(con, "mydbsequence");
int i = sequence.nextValue();
When I call sequence.nextValue() method, I got the following error message: NullPointerException
at Weblogic.jdbc.rmi.SerialConnection.createStatement(SerialConnection.java:65).
Does anyone know what causes this error? and How do I fix it? Please advise me
on this. Thank you very much.
QinSequence is a non-standard JDBC object. It is an Oracle-specific class, which presumably
takes a standard java.sql.Connection in it's constructor. Oracle has repeatedly created
such new classes with methods claiming to take java.sql.* arguments, but in fact they
require an Oracle-specific class. In this case, however, we might succeed anyway if
we dig some. Can you show me the entire stacktrace of the exception?
Please take the attached jar file, and put it in front of all the weblogic stuff
in the server's classpath, and repeat the problem and show me the new exception.
From the line, I am assuming you're on the 6.1 version of WebLogic. If not, forget the
jar, and let me know.
Joe
[61rmicon.jar]