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Use var for reference-typed variables

org.openrewrite.java.migrate.lang.var.UseVarForObject
Try to apply local variable type inference var to variables containing Objects where possible. This recipe will not touch variable declarations with generics or initializers containing ternary operators.
Recipe source
​GitHub, Issue Tracker, Maven Central​
groupId: org.openrewrite.recipe
artifactId: rewrite-migrate-java
version: 2.3.0
Usage
This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite.recipe:rewrite-migrate-java:2.3.0 in your build file or by running a shell command (in which case no build changes are needed):
Gradle
Gradle init script
Maven POM
Maven Command Line
Moderne CLI
1.Add the following to your build.gradle file:
build.gradle
plugins {
    id("org.openrewrite.rewrite") version("6.5.6")
}
​
rewrite {
    activeRecipe("org.openrewrite.java.migrate.lang.var.UseVarForObject")
}
​
repositories {
    mavenCentral()
}
​
dependencies {
    rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.3.0")
}
2.Run gradle rewriteRun to run the recipe.
1.Create a file named init.gradle in the root of your project.
init.gradle
initscript {
    repositories {
        maven { url "https://plugins.gradle.org/m2" }
    }
    dependencies { classpath("org.openrewrite:plugin:6.5.6") }
}
rootProject {
    plugins.apply(org.openrewrite.gradle.RewritePlugin)
    dependencies {
        rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.3.0")
    }
    rewrite {
        activeRecipe("org.openrewrite.java.migrate.lang.var.UseVarForObject")
    }
    afterEvaluate {
        if (repositories.isEmpty()) {
            repositories {
                mavenCentral()
            }
        }
    }
}
2.Run gradle --init-script init.gradle rewriteRun to run the recipe.
1.Add the following to your pom.xml file:
pom.xml
<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.openrewrite.maven</groupId>
        <artifactId>rewrite-maven-plugin</artifactId>
        <version>5.13.0</version>
        <configuration>
          <activeRecipes>
            <recipe>org.openrewrite.java.migrate.lang.var.UseVarForObject</recipe>
          </activeRecipes>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>org.openrewrite.recipe</groupId>
            <artifactId>rewrite-migrate-java</artifactId>
            <version>2.3.0</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>
2.Run mvn rewrite:run to run the recipe.
shell
mvn -U org.openrewrite.maven:rewrite-maven-plugin:run \
  -Drewrite.recipeArtifactCoordinates=org.openrewrite.recipe:rewrite-migrate-java:RELEASE \
  -Drewrite.activeRecipes=org.openrewrite.java.migrate.lang.var.UseVarForObject
You will need to have configured the Moderne CLI on your machine before you can run the following command.
shell
mod run . --recipe UseVarForObject
See how this recipe works across multiple open-source repositories
​​
​​
The community edition of the Moderne platform enables you to easily run recipes across thousands of open-source repositories.
Please contact Moderne for more information about safely running the recipes on your own codebase in a private SaaS.
Contributors
​Merlin Bögershausen, Knut Wannheden, Mike Solomon​
Use var for primitive-typed variables
java.net APIs
Last modified 9d ago