Stop Auto creation of database every time restarting the server

[sankarkts]

I want to stop the auto creation of database tables since i changed the persistence.xml
file to property name hibernate.hbm2ddl.auto value create-drop  to property name hibernate.hbm2ddl.auto value update
But while running server it shows error as EntityManager is closed, can any one suggest me regarding this

[schlegel]

Try hibernate.hbm2ddl.auto value validate
or create