mysql - JDBC exception while connecting to remote database -

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i have spring project connects remote mysql database , displays data it. app tested in eclipse on tomcat localhost server , there no problems. later on, extracted project in .war format , uploaded on openshift.com server, , worked more 2 weeks. suddenly, error when open on server:

http status 500 - request processing failed; nested exception java.lang.runtimeexception: com.mysql.jdbc.exceptions.jdbc4.communicationsexception: communications link failure  type exception report  message request processing failed; nested exception java.lang.runtimeexception: com.mysql.jdbc.exceptions.jdbc4.communicationsexception: communications link failure  description server encountered internal error prevented fulfilling request.  exception  org.springframework.web.util.nestedservletexception: request processing failed; nested exception java.lang.runtimeexception: com.mysql.jdbc.exceptions.jdbc4.communicationsexception: communications link failure  last packet sent server 0 milliseconds ago. driver has not received packets server.     org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:894)     org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:778)     javax.servlet.http.httpservlet.service(httpservlet.java:620)     javax.servlet.http.httpservlet.service(httpservlet.java:727)     org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)

i opened same project in eclipse (connected online database) , there no error. extracted app in new .war file , deleted old 1 on server , replaced new one. , guess what, still same exception occurs. basically, have 1 application, connects remote database, , works fine when run on localhost, not work when put on hosting server (it working on server time weird). have gone wrong?


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