Simply create a properties file matching the name of the required data source in a directory called "/config" on the classpath.
ie: to define the JNDI data source "jdbc/myDataSourceName", place the contents below in the file "/config/jdbc/myDataSourceName.properties" on the classpath:

	javax.sql.DataSource=org.apache.commons.dbcp.BasicDataSourceFactory
	driverClassName=org.gjt.mm.mysql.Driver
	url=jdbc\:mysql\://localhost/test
	username=test
	password=test
	database=test
	maxActive=200	
	

Note: this data source uses DBCP as a factory.