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Prefer Set.of(..) in Java 9 or higher

org.openrewrite.java.migrate.guava.NoGuavaImmutableSetOf

Replaces ImmutableSet.of(..) if the returned type is immediately down-cast. Java 9 introduced List#of(..), Map#of(..), Set#of(..) which is similar to ImmutableList#of(..), ImmutableMap#of(..), ImmutableSet#of(..), but has a subtle difference. As per the Java 9 documentation, Set.of provides an unspecified iteration order on the set of elements and is subject to change, whereas Guava ImmutableSet preserves the order from construction time. This is worth pointing out in case your usage calls for iteration order being important.

Tags

  • RSPEC-4738
  • guava

Source

GitHub, Issue Tracker, Maven Central

  • groupId: org.openrewrite.recipe
  • artifactId: rewrite-migrate-java
  • version: 2.0.1

Usage

This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite.recipe:rewrite-migrate-java:2.0.1 in your build file or by running a shell command (in which case no build changes are needed): {% tabs %} {% tab title="Gradle" %} {% code title="build.gradle" %}

plugins {
    id("org.openrewrite.rewrite") version("6.1.4")
}

rewrite {
    activeRecipe("org.openrewrite.java.migrate.guava.NoGuavaImmutableSetOf")
}

repositories {
    mavenCentral()
}

dependencies {
    rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.0.1")
}

{% endcode %} {% endtab %} {% tab title="Maven POM" %} {% code title="pom.xml" %}

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.openrewrite.maven</groupId>
        <artifactId>rewrite-maven-plugin</artifactId>
        <version>5.2.4</version>
        <configuration>
          <activeRecipes>
            <recipe>org.openrewrite.java.migrate.guava.NoGuavaImmutableSetOf</recipe>
          </activeRecipes>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>org.openrewrite.recipe</groupId>
            <artifactId>rewrite-migrate-java</artifactId>
            <version>2.0.1</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

{% endcode %} {% endtab %}

{% tab title="Maven Command Line" %} {% code title="shell" %} You will need to have Maven installed on your machine before you can run the following command.

mvn -U org.openrewrite.maven:rewrite-maven-plugin:run \
  -Drewrite.recipeArtifactCoordinates=org.openrewrite.recipe:rewrite-migrate-java:RELEASE \
  -Drewrite.activeRecipes=org.openrewrite.java.migrate.guava.NoGuavaImmutableSetOf

{% endcode %} {% endtab %} {% endtabs %}

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