code: @Override
      public GroupExecutionSpecifier observe(Class<? extends RequestObserver> observer) {
          this.observer = SecurityActions.newInstance(observer.getName(), new Class<?>[] {}, new Object[] {},
              RequestFilter.class);
          return this;
      }
docs: /*
  (non-Javadoc)
  @see org.jboss.arquillian.warp.client.execution.FilterSpecifier#filter(java.lang.Class)