The ij.protocol property specifies the default protocol and subprotocol portions of the database connection URL for connections.
The Derby protocol is:
jdbc:derby:
The property allows you to use a short form of a database name in a connection URL.
ij.protocol=protocolForEnvironment
java -Dij.protocol=jdbc:derby: org.apache.derby.tools.ij
ij version 10.17
ij> Connect 'newDB;create=true';
ij>