AbstractMethodError exception on an executeUpdate call

Hi Everyone,

I am using pg73rc1jdbc2.jar. i get this:
Caused by: java.lang.AbstractMethodError: org.postgresql.jdbc2.Jdbc2Statement.executeUpdate(Ljava/lang/String;I)I
at org.apache.commons.dbcp.DelegatingStatement.executeUpdate(DelegatingStatement.java:252)

the code that causes this is:
st.executeUpdate(SQL, Statement.RETURN_GENERATED_KEYS);

Not quite sure why this is happening. after searching throught the archives the only answer i could find was that i am not using the right version of the driver. but i am using a version 2 jdbc driver so it cant be that right?

Any ideas why this is happening? does anybody else get the same problem?

Thanks in advance.

Ziad

p.s. set up:
tomcat 4.1
postgreSQL 7
windows 2000 professional
jdbc 7.3rc1 version 2