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Migrate to Java 21

org.openrewrite.java.migrate.UpgradeToJava21
This recipe will apply changes commonly needed when migrating to Java 21. This recipe will also replace deprecated API with equivalents when there is a clear migration strategy. Build files will also be updated to use Java 21 as the target/source and plugins will be also be upgraded to versions that are compatible with Java 21.

Tags

  • java21

Recipe source

  • groupId: org.openrewrite.recipe
  • artifactId: rewrite-migrate-java
  • version: 2.9.0
This recipe is composed of more than one recipe. If you want to customize the set of recipes this is composed of, you can find and copy the GitHub source for the recipe from the link above.

Usage

This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite.recipe:rewrite-migrate-java:2.9.0 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("6.8.4")
}
rewrite {
activeRecipe("org.openrewrite.java.migrate.UpgradeToJava21")
}
repositories {
mavenCentral()
}
dependencies {
rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.9.0")
}
  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:6.8.4") }
}
rootProject {
plugins.apply(org.openrewrite.gradle.RewritePlugin)
dependencies {
rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.9.0")
}
rewrite {
activeRecipe("org.openrewrite.java.migrate.UpgradeToJava21")
}
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>5.23.1</version>
<configuration>
<activeRecipes>
<recipe>org.openrewrite.java.migrate.UpgradeToJava21</recipe>
</activeRecipes>
</configuration>
<dependencies>
<dependency>
<groupId>org.openrewrite.recipe</groupId>
<artifactId>rewrite-migrate-java</artifactId>
<version>2.9.0</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.UpgradeToJava21
You will need to have configured the Moderne CLI on your machine before you can run the following command.
shell
mod run . --recipe UpgradeToJava21

Definition

Recipe List
Yaml Recipe List
---
type: specs.openrewrite.org/v1beta/recipe
name: org.openrewrite.java.migrate.UpgradeToJava21
displayName: Migrate to Java 21
description: This recipe will apply changes commonly needed when migrating to Java 21. This recipe will also replace deprecated API with equivalents when there is a clear migration strategy. Build files will also be updated to use Java 21 as the target/source and plugins will be also be upgraded to versions that are compatible with Java 21.
tags:
- java21
recipeList:
- org.openrewrite.java.migrate.UpgradeToJava17
- org.openrewrite.java.migrate.JavaVersion21
- org.openrewrite.java.migrate.RemoveIllegalSemicolons
- org.openrewrite.java.migrate.lang.ThreadStopUnsupported
- org.openrewrite.java.migrate.net.URLConstructorsToURIRecipes
- org.openrewrite.java.migrate.util.SequencedCollection
- org.openrewrite.java.migrate.util.UseLocaleOf
- org.openrewrite.staticanalysis.ReplaceDeprecatedRuntimeExecMethods
- org.openrewrite.github.SetupJavaUpgradeJavaVersion:
- org.openrewrite.gradle.UpdateGradleWrapper:
version: 8.5
addIfMissing: false
- org.openrewrite.maven.UpgradePluginVersion:
groupId: org.jacoco
artifactId: jacoco-maven-plugin
newVersion: 0.8.+
- org.openrewrite.maven.UpgradePluginVersion:
groupId: com.sonatype.clm
artifactId: clm-maven-plugin
newVersion: 2.47.8-01
- org.openrewrite.java.dependencies.UpgradeDependencyVersion:
groupId: com.google.guava
artifactId: guava
newVersion: 29.0
versionPattern: -jre
- org.openrewrite.java.dependencies.UpgradeDependencyVersion:
groupId: net.bytebuddy
artifactId: byte-buddy
newVersion: 1.14.11

See how this recipe works across multiple open-source repositories

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