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MINOR: Cleanup Core Module- Scala Modules (4/n) #19805

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sjhajharia
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Now that Kafka Brokers support Java 17, this PR makes some changes in
core module. The changes in this PR are limited to only some Scala files
in the Core module's tests. 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()

To be clear, the directories being targeted in this PR from unit.kafka module:

  • log
  • network
  • security
  • tools
  • utils

@github-actions github-actions bot added triage PRs from the community core Kafka Broker tests Test fixes (including flaky tests) labels May 24, 2025
@@ -567,7 +567,7 @@ class AuthorizerTest extends QuorumTestHarness with BaseAuthorizerTest {
val acl3 = new AclBinding(resource2, new AccessControlEntry(principal.toString, WILDCARD_HOST, DESCRIBE, ALLOW))
val acl4 = new AclBinding(prefixedResource, new AccessControlEntry(wildcardPrincipal.toString, WILDCARD_HOST, READ, ALLOW))

authorizer1.createAcls(requestContext, List(acl1, acl2, acl3, acl4).asJava)
authorizer1.createAcls(requestContext, util.List.of(acl1, acl2, acl3, acl4))
assertEquals(Set(acl1, acl2, acl3, acl4), authorizer1.acls(AclBindingFilter.ANY).asScala.toSet)
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Could we change it to java.util.Set?

@sjhajharia
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Hey @frankvicky
Thanks for the initial look. I have addressed most of the comments. Answered one.

@github-actions github-actions bot removed the triage PRs from the community label May 30, 2025
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