Suppress warnings in generated java source files (#365)

[rpost]

fixes #365

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.33%. Comparing base (a3d30c7) to head (7d52e06).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #366 +/- ## ========================================= Coverage 91.32% 91.33% Complexity 1215 1215 ========================================= Files 76 76 Lines 3160 3161 +1 Branches 489 489 ========================================= + Hits 2886 2887 +1 Misses 164 164 Partials 110 110 ```

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