1.Copy postgresql jar glassfish4/glassfish/domains/domain1/lib/ext
2.start glassfish
	asadmin start-domain
3.Create Connection Pool (DataSource)
	asadmin create-jdbc-connection-pool
	--datasourceclassname org.postgresql.ds.PGSimpleDataSource
	--restype javax.sql.DataSource
	--property user=USER_NAME:password=PASSWORD:DatabaseName=DB_NAME:ServerName=HOST_NAME:port=PORT_NAME
	postgresql-pool(DataSource Name)

Optional
 4.Setting min/max sizes - via the command line
	To set the initial & minimum pool size:
		asadmin set resources.jdbc-connection-pool.test-pool.steady-pool-size=10
	To set the maximum pool size:
		asadmin set resources.jdbc-connection-pool.test-pool.max-pool-size=200

5.Connection Validation
	asadmin set resources.jdbc-connection-pool.postgresql-pool.connection-validation-method=custom-validation
	asadmin set resources.jdbc-connection-pool.postgresql-pool.validation-classname=org.glassfish.api.jdbc.validation.PostgresConnectionValidation
	asadmin set resources.jdbc-connection-pool.postgresql-pool.is-connection-validation-required=true



	You can also set whether to close all connections on failure with the following command:
		asadmin set resources.jdbc-connection-pool.postgresql-pool.fail-all-connections=true

6.Statement and Connection Leak Detection
	asadmin set resources.jdbc-connection-pool.postgresql-pool.statement-leak-timeout-in-seconds=5
	asadmin set resources.jdbc-connection-pool.postgresql-pool.connection-leak-timeout-in-seconds=5