ons-core/ons-client/src/main/java/org/apache/rocketmq/ons/api/impl/rocketmq/BatchConsumerImpl.java [76:87]:
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        if (null == topic) {
            throw new ONSClientException("topic is null");
        }

        if (null == listener) {
            throw new ONSClientException("listener is null");
        }
        this.subscribeTable.put(topic, listener);
        super.subscribe(topic, subExpression);
    }

    @Override
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ons-core/ons-client/src/main/java/org/apache/rocketmq/ons/api/impl/rocketmq/OrderConsumerImpl.java [61:72]:
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        if (null == topic) {
            throw new ONSClientException("topic is null");
        }

        if (null == listener) {
            throw new ONSClientException("listener is null");
        }
        this.subscribeTable.put(topic, listener);
        super.subscribe(topic, subExpression);
    }

    @Override
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