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From Sriram Subramanian <sriram_...@yahoo.com>
Subject java.sql.SQLException: Error unmarshaling return
Date Thu, 26 May 2005 16:54:41 GMT
I am trying to setup Derby to use the RmiJdbc client / server (http://rmijdbc.objectweb.org/current/RmiJdbc/doc/index.html).
Firstly, I'm curious if anybody has ever tried this before. I'm trying this out because there
seem to be some licensing issues with using the IBM db2cc driver if u want to run Derby as
a network server. 
My setup consists of a client which uses the RmiJdbc driver to talk to the RmiJdbc server,
and the server in turn talks to the Derby database. During startup, I have the server load
the apache derby embedded driver and bind itself to the rmiregistry.
# java org.objectweb.rmijdbc.RJJdbcServer org.apache.derby.jdbc.EmbeddedDriver
My client program first loads the RmiJdbc driver and then connects to the Derby database with
the following URL - jdbc:rmi://localhost/jdbc:derby:testdb. This part goes fine. But if I
try to fetch something from the database, I get the following exception:
java.sql.SQLException: Error unmarshaling return; nested exception is: java.io.InvalidClassException:
org.apache.derby.impl.jdbc.EmbedSQLException; local class incompatible: stream classdesc serialVersionUID
= -6688465790235736597, local class serialVersionUID = -8950025864534516143
at org.objectweb.rmijdbc.RJStatement.executeQuery(RJStatement.java:51)
at TestClient.main(TestClient.java:55)
I'm not sure if this is a bug with derby being unable to serialialize database objects, or
if something is wrong with my setup? Would really appreciate any suggestions/pointers. btw,
I also looked at the Derby network client which is not part of the official derby release
yet. But I was not able to get that to work either...
- Sriram

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