ctubbsii opened a new issue #1193: Replace use of Guava Immutable* with Java 11 built-in unmodifiables URL: https://github.com/apache/accumulo/issues/1193 Java now has built-in immutable objects for `Set.of`, `List.of`, `Map.of` (and also `.copyOf` variants) and we no longer need to use Guava's `ImmutableSet.of`, etc., methods. The use of `Immutable*.Builder` classes can also be discontinued. Options for replacing those include using streams with a `Collectors.toUnmodifiable*` collector, or using a temporary mutable version, and wrapping with `Collections.unmodifiable*` instead of calling `.build()` on the `Builder`. The more we can use Java built-ins instead of Guava classes, the easier it is to upgrade between Guava versions with less risk of breakage, and possibly move towards removing the dependency altogether, or making it easier to shade. Usages of these APIs that have built-in replacements are (mostly) automatically caught by the modernizer plugin, so they should be easy to find by using the latest version of that plugin with a Java 11 build. I'm currently working on this, in order to get our build updated to use Java 11.
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