@Override
    public java.util.concurrent.Future<ListSigningCertificatesResult> listSigningCertificatesAsync() {

        return listSigningCertificatesAsync(new ListSigningCertificatesRequest());
    }
Simplified method form for invoking the ListSigningCertificates operation.

@see #listSigningCertificatesAsync(ListSigningCertificatesRequest)
aws-java-sdk-iam/src/main/java/com/amazonaws/services/identitymanagement/AmazonIdentityManagementAsyncClient.java