I am glad to see that you have successfully achieved your goal using the CustomJavaComponent. Thanks for posting the solution.
However, I am a little bit concerned about the UniversalDataWriter difficulties as well. Would you be so kind and tell me what exactly have you experienced? As a matter of fact, the UniversalDataWriter should be able to write the byte field type to file as well. I have created a simple graph for your review (in attachment, use any picture as input data). Please review especially the metadata setup:
Please let me know what is your use case and what issue exactly you have encountered as I can provide more details. Thank you, Eva
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