One of the many cool new features in Java EE 6, is support for the DataSourceDefinition annotation.
The DataSourceDefinition annotation provides a way to define a DataSource and register it with JNDI. The annotation provided annotation elements for the commonly used DataSource properties. Additional standard and vendor specific properties may also be specified.
So let us look at an example:
className = "org.apache.derby.jdbc.ClientDataSource",
portNumber = 1527,
serverName = "localhost",
databaseName = "testDB", …