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There could be several reasons why kafka-console-consumer.sh is working while KafkaConsumer is not able to poll messages. Here are a few possible reasons:

1. Connection issue: KafkaConsumer may not be able to connect to the Kafka broker due to some network issues or incorrect broker address configuration.

2. Topic subscription issue: KafkaConsumer may not be successfully subscribed to the topic it wants to consume messages from. This could happen if the topic name is misspelled or the partition configuration is incorrect.

3. Consumer group issue: KafkaConsumer may be part of a consumer group that is not properly configured, which may prevent it from receiving messages.

4. Serialization issue: KafkaConsumer may not be able to deserialize the messages properly if the message format is not compatible with the deserializer used by KafkaConsumer.

5. Permission issue: KafkaConsumer may not have the necessary permissions to read messages from the topic due to some access control configurations.

It's important to check the logs and error messages to identify the specific issue that is causing KafkaConsumer to fail with message consumption.