code: @Override
    public void afterPropertiesSet() throws Exception {
      Assert.hasText(this.entityID, "Property 'entityID' must be assigned");
      Assert.notNull(this.authnContextService, "Property 'authnContextService' must be assigned");
      Assert.notNull(this.signatureSupportKeyService, "Property 'signatureSupportKeyService' must be assigned");
      Assert.notNull(this.sadFactory, "Property 'sadFactory' must be assigned");
    }
docs: {@inheritDoc}