When TomEE starts it starts an internal application (called openejb). The goal is to offer some internal beans mainly used by TomEE tooling (TomEE deployer, reload feature of TomEE maven plugin…).
But depending on your environment (typically with WTP) it can be useless and just make you loose some startup time.
To avoid this application to be deployed just add the following system property:
openejb.system.apps = false