in flink-connector-rabbitmq/src/main/java/org/apache/flink/streaming/connectors/rabbitmq/RMQSink.java [120:126]
public RMQSink(
RMQConnectionConfig rmqConnectionConfig,
SerializationSchema<IN> schema,
RMQSinkPublishOptions<IN> publishOptions,
SerializableReturnListener returnListener) {
this(rmqConnectionConfig, null, schema, publishOptions, returnListener);
}