WebLogic JNDI - Not Closing The Initial Context

wls_jndi_variant1.java

@WebService
public class FacadeJaxWs implements FacadeWebService {
  @EJB(lookup = "FrontendEjb")
  protected FrontendEjbHome frontendEjbHome;

  public void updateCustomer() {
    Properties envBackend = new Properties();
    envBackend.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
    envBackend.put(Context.PROVIDER_URL, "t3://backend:7001");
    envBackend.put(Context.SECURITY_PRINCIPAL, "backend_user");
    envBackend.put(Context.SECURITY_CREDENTIALS, "backend_password");

    Context ctxBackend = new InitialContext(envBackend);
    BackendEjbHome home = (BackendEjbHome) ctxBackend.lookup("BackendEjb");
    BackendEjb remote = home.create();
    remote.updateCustomerInBackend(mode);

    FrontendEjb remote = frontendEjbHome.create();
    remote.updateCustomerInFrontend(mode);
  }

}