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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

  • 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. 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")
}
  1. 2.
    Run gradle rewriteRun to run the recipe.
  1. 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()
}
}
}
}
  1. 2.
    Run gradle --init-script init.gradle rewriteRun to run the recipe.
  1. 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>
  1. 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

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