JDBC - MS SQL Server 2005 with multible instances

Question

I want to get data from a Microsoft SQL Server via JDBC. We have such a scenario and till now it works fine. Now we have a second instance at the sql server and we want to connect to this instance. I've found the following MSD article:
http://msdn2.microsoft.com/en-us/library/ms378428.aspx
<b>SQL Server 2000 and SQL Server 2005 allow for the installation of multiple database instances per server. Each instance is identified by a specific name. To connect to a named instance of SQL Server, you can either specify the port number of the named instance (preferred), or you can specify the instance name as a JDBC URL property or a datasource property. If no instance name or port number property is specified, a connection to the default instance is created. See the following examples:
To use a port number, do the following:
jdbc:sqlserver://localhost:1433;integratedSecurity=true;<more properties as required>;
To use a JDBC URL property, do the following:
jdbc:sqlserver://localhost;instanceName=instance1;integratedSecurity=true;<more properties as required>;</b>
Because the named instance has no explicit port  I've tried to use the second one but this doesn't work. I've tried all possible combinations of these parameters but either I get an error or my adapter connects to the first instance
Any idea how I can connect to the second named instance?

Answer 1

We have also a SQL server 2000 instance at the same server. Yesterday I have spoken with the sql server admin and he told me that he has disconnect the sql server 2000 databases whatever this means. :-D
Now all works fine. Thank you for your help
BTW I use the following connection string:
jdbc:sqlserver://my_db_server;instanceName=my_instance_name;DatabaseName=my_db_name