Derby shutdown question

[Mikael]

Hi !

Derby: 10.4.1.3
I run a Derby server like:
   private NetworkServerControl    server;
   server = new NetworkServerControl( InetAddress.getByName( "localhost"), 
port);
   server.start( null);

Later on I close all connections and shutdown the server like:
  server.shutdown();
  server = null;

And then I start the server again just like above, but this does not work, I 
can open a
connection but when I execute a query it fails with something like:

java.sql.SQLNonTransientConnectionException: Insufficient data while reading 
from the network - expected a minimum of 6 bytes and received only -1 bytes. 
The connection has been terminated.
       at 
org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown 
Source)
       at org.apache.derby.client.am.SqlException.getSQLException(Unknown 
Source)
       at org.apache.derby.client.am.DatabaseMetaData.getTables(Unknown 
Source)

This was with a metadata.getTables() call but it is the same thing with any 
sql query.

Is there anything else I have to do to get the server to shutdown and 
restart correct ?

Mikael