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MINOR: Cleanup Connect Module (1/n) #19869

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sjhajharia
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Now that Kafka support Java 17, this PR makes some changes in connect module. The changes in this PR are limited to only some files. A future PR(s) shall follow.
The changes mostly include:

  • Collections.emptyList(), Collections.singletonList() and Arrays.asList() are replaced with List.of()
  • Collections.emptyMap() and Collections.singletonMap() are replaced with Map.of()
  • Collections.singleton() is replaced with Set.of()

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Thank @sjhajharia for this patch, left some comments

assertSchemaMatches(SchemaBuilder.map(Schema.STRING_SCHEMA, Schema.INT32_SCHEMA), new HashMap<String, Integer>());
assertSchemaMatches(SchemaBuilder.map(Schema.STRING_SCHEMA, Schema.INT32_SCHEMA), Collections.singletonMap("a", 0));
assertSchemaMatches(SchemaBuilder.map(Schema.STRING_SCHEMA, Schema.INT32_SCHEMA), Map.of("a", 0));
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L506 List.of()

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It was leading to NPEs. The elements in the List may be null. Hence it must be kept as Arrays.asList.

@sjhajharia
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Hey @m1a2st , Thanks for the review.
Requesting a re-review.

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Thanks, LGTM

@github-actions github-actions bot removed the triage PRs from the community label Jun 4, 2025
@sjhajharia
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Thanks for the review @m1a2st
cc: @frankvicky

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