We are migrating our applications from Wildfly 10 to Wildfly 12 and sometimes Wildfly 12 trigger @Startup (with @PostContruct) or @WebListener or (@Observes @Initialized(ApplicationScoped.class) before some components has started.

Ex:

• At these moments we can't inject remote EJBs (simple new InitialContext().lookup(jndi))
• Sometimes these @Observes is fired with null parameter

  public void observesContext(@Observes @Initialized(ApplicationScoped.class) ServletContext context){
  	this.context = context;
  }
  

These behavior olny occurs when the server is starting with the application deployed.
When the application is deployed after the server is up and running, all goes fine a work.