Question

Why DataSource interface does not define the Standard Data Source Properties specified by the JDBC – DataSource?

With a reference dsof the DataSource type I cannot set the following properties like this:

public DbUtil(DataSource ds, String dbName, String port){
  ds.setServerName(dbName);
  ds.setPortNumber(port); 
}

Answer 1

Because you’re not supposed to pass in those values unlike plain old DriverManager. A DataSource is normally configured on the container and only looked-up using JNDI.

If you again start passing in these values, it defeats the whole point of having configurable DataSources.

Here is a quote from the API.

The DataSource interface is implemented by a driver vendor.

A DataSource object has properties that can be modified when
necessary. For example, if the data source is moved to a different
server, the property for the server can be changed. The benefit is
that because the data source’s properties can be changed, any code
accessing that data source does not need to be changed.