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If you want to create a class that can instantitate once. This is the right document for you. Or those who don’t want to fall into the trap of singleton class.
http://www.javaworld.com/javaworld/jw-04-2003/jw-0425-designpatterns.html?page=1
Error 503–Service Unavailable
From RFC 2068 Hypertext Transfer Protocol — HTTP/1.1:
10.5.4 503 Service Unavailable
The server is currently unable to handle the request due to a temporary overloading or maintenance of the server. The implication is that this is a temporary condition which will be alleviated after some delay. If known, the length of the delay may be indicated in a Retry-After header. If no Retry-After is given, the client SHOULD handle the response as it would for a 500 response.
Note: The existence of the 503 status code does not imply that a server must use it when becoming overloaded. Some servers may wish to simply refuse the connection.
The Application has to be started after the deployment. It means whatever you do, you must start the application. And not just start the admin server.
