[root@localhost root]# javac JdbcDemo.java
[root@localhost root]# java JdbcDemo
 Exception geneated The connection attempt failed because Exception: java.net.So     cketException: Network is unreachable
Stack Trace:

java.net.SocketException: Network is unreachable
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
        at java.net.Socket.connect(Socket.java:426)
        at java.net.Socket.connect(Socket.java:376)
        at java.net.Socket.<init>(Socket.java:291)
        at java.net.Socket.<init>(Socket.java:119)
        at org.postgresql.PG_Stream.<init>(PG_Stream.java:38)
        at org.postgresql.jdbc1.AbstractJdbc1Connection.openConnection(AbstractJ     dbc1Connection.java:160)
        at org.postgresql.Driver.connect(Driver.java:122)
        at java.sql.DriverManager.getConnection(DriverManager.java:512)
        at java.sql.DriverManager.getConnection(DriverManager.java:171)
        at JdbcDemo.<init>(JdbcDemo.java:12)
        at JdbcDemo.main(JdbcDemo.java:43)
End of Stack Trace