How does DriverManager know who owns jdbc:default:connection?

[Kathey Marsden]

I am working on an issue where two applications (one connecting to  DB2 
with JCC) and one using Derby are running in the same JVM.  When using 
server side JDBC using 
DriverManager.getConnection("jdbc:default:connection"), the JCC driver, 
which is used for DB2 server side JDBC, accepts the url  and tries to 
make a DB2 T2 connection.   It seems valid for JCC, like the Derby 
embedded driver to accept this url.  With multiple Drivers in the same 
JVM, how can DriverManager differentiate?

Thanks
Kathey