[Bug]: Java: Generated samples have a "is not used" warning

[lmazuel]

Describe the bug

After generating samples, all samples have a warning like this:

Reproduction

I used this tsplocattion:

directory: specification/purview/data-plane/datamap
commit: 0c932f4a1e126784161397209484678f3adda2f6
repo: Azure/azure-rest-api-specs

applied to the purview datamape package (just call tspclient update)

Checklist

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• The provided reproduction is a minimal reproducible example of the bug.