[04:51:23 ERROR]: [com.avaje.ebean.config.PropertyMapLoader] ebean.properties not found
[04:51:23 INFO]: [com.avaje.ebeaninternal.server.lib.sql.DataSourcePool] DataSourcePool [Gringotts] autoCommit[false] transIsolation[SERIALIZABLE] min[2] max[20]
[04:51:24 INFO]: [com.avaje.ebeaninternal.server.subclass.SubClassManager] SubClassFactory parent ClassLoader [org.bukkit.plugin.java.PluginClassLoader]
[04:51:24 INFO]: [com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager] Entities enhanced[0] subclassed[2]

This has popped up at the near-begging of the server console after installing Gringotts. I'm not sure what it is, or if it's a incompatibility with another plugin, etc.

if you are referring to the error "ebean.properties not found", it is safe to ignore, or you may create an empty ebean.properties n the same folder as your server.properties.