DERBY-2905, we have a new connection url attribute - deregister. After a shutdown of the embedded driver, the AutoloadedDriver is unregistered from the DriverManager. Users who wish to keep the AutoloadedDriver can set the deregister attribute on the connection url to false. It is only valid with shutdown=true. And, the default behavior with shutdown=true is deregister=true.
'shutdown=true;deregister=true" (It is okay not to specify deregister=true)