When setting up a Datasource in IDEA, I have to search for the relevant JDBC driver JAR each time. This is annoying, since I usually don't remember where the file is located. For example, perhaps it can only be found somewhere deep inside my local Maven 2 repository. Most other JDBC clients solve this by having the concept of a predefined list of drivers: you define a driver once, and then you can create Datasources/Connections from that.