changed the grails build project to servlet 2.5 API, since i am still running tomcat6 on server
after 8 hours i get a
java.net.SocketException Broken pipe
started to implement some hints to resolve this from:
http://stackoverflow.com/questions/2740987/mysql-connection-timeout-issue-grails-application-on-tomcat-using-hibernate-an
http://stackoverflow.com/questions/19454551/grails-2-3-0-and-mysql-connection-timeout