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

GitHub, Issue Tracker, Maven Central

info

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.

License

This recipe is available under the Moderne Source Available License.

Definition

Recipe List

• Migrate to Java 17
• Upgrade build to Java 21
• Remove illegal semicolons
• Replace Thread.resume(), Thread.stop(), and Thread.suspend() with throw new UnsupportedOperationException()
• URLConstructorsToURI Refaster recipes
• Adopt SequencedCollection
• Prefer Locale.of(..) over new Locale(..)
• Replace deprecated Runtime#exec() methods
• Upgrade actions/setup-java java-version
• Upgrade plugins to Java 21 compatible versions
• Avoid using the deprecated empty finalize() method in java.desktop
• Adopt javax.security.auth.Subject.current() and javax.security.auth.Subject.callAs() methods`

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.UpgradeBuildToJava21
  - 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.java.migrate.UpgradePluginsForJava21
  - org.openrewrite.java.migrate.DeleteDeprecatedFinalize
  - org.openrewrite.java.migrate.RemovedSubjectMethods

Usage

This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite.recipe:rewrite-migrate-java in your build file or by running a shell command (in which case no build changes are needed):

Gradle

1. Add the following to your build.gradle file:

build.gradle

plugins {
    id("org.openrewrite.rewrite") version("6.28.3")
}

rewrite {
    activeRecipe("org.openrewrite.java.migrate.UpgradeToJava21")
    setExportDatatables(true)
}

repositories {
    mavenCentral()
}

dependencies {
    rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.31.0")
}

2. Run gradle rewriteRun to run the recipe.

Gradle init script

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:6.28.3") }
}
rootProject {
    plugins.apply(org.openrewrite.gradle.RewritePlugin)
    dependencies {
        rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.31.0")
    }
    rewrite {
        activeRecipe("org.openrewrite.java.migrate.UpgradeToJava21")
        setExportDatatables(true)
    }
    afterEvaluate {
        if (repositories.isEmpty()) {
            repositories {
                mavenCentral()
            }
        }
    }
}

2. Run the recipe.

shell

gradle --init-script init.gradle rewriteRun

Maven POM

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>5.47.0</version>
        <configuration>
          <exportDatatables>true</exportDatatables>
          <activeRecipes>
            <recipe>org.openrewrite.java.migrate.UpgradeToJava21</recipe>
          </activeRecipes>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>org.openrewrite.recipe</groupId>
            <artifactId>rewrite-migrate-java</artifactId>
            <version>2.31.0</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

2. Run mvn rewrite:run to run the recipe.

Maven Command Line

You will need to have Maven installed on your machine before you can run the following command.

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 -Drewrite.exportDatatables=true

Moderne CLI

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell

mod run . --recipe UpgradeToJava21

If the recipe is not available locally, then you can install it using:

mod config recipes jar install org.openrewrite.recipe:rewrite-migrate-java:2.31.0

See how this recipe works across multiple open-source repositories

Run this recipe on OSS repos at scale with the Moderne SaaS.

Run this recipe here

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.

Data Tables

Source files that had results

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column Name	Description
Source path before the run	The source path of the file before the run. null when a source file was created during the run.
Source path after the run	A recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Parent of the recipe that made changes	In a hierarchical recipe, the parent of the recipe that made a change. Empty if this is the root of a hierarchy or if the recipe is not hierarchical at all.
Recipe that made changes	The specific recipe that made a change.
Estimated time saving	An estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
Cycle	The recipe cycle in which the change was made.

Source files that errored on a recipe

org.openrewrite.table.SourcesFileErrors

The details of all errors produced by a recipe run.

Column Name	Description
Source path	The file that failed to parse.
Recipe that made changes	The specific recipe that made a change.
Stack trace	The stack trace of the failure.

Recipe performance

org.openrewrite.table.RecipeRunStats

Statistics used in analyzing the performance of recipes.

Column Name	Description
The recipe	The recipe whose stats are being measured both individually and cumulatively.
Source file count	The number of source files the recipe ran over.
Source file changed count	The number of source files which were changed in the recipe run. Includes files created, deleted, and edited.
Cumulative scanning time	The total time spent across the scanning phase of this recipe.
99th percentile scanning time	99 out of 100 scans completed in this amount of time.
Max scanning time	The max time scanning any one source file.
Cumulative edit time	The total time spent across the editing phase of this recipe.
99th percentile edit time	99 out of 100 edits completed in this amount of time.
Max edit time	The max time editing any one source file.

Contributors

Chuka Obinabo, Tim te Beek, Anu Ramamoorthy, Sam Snyder, Jonathan Schneider, BhavanaPidapa, Knut Wannheden, Jonathan Schnéider, traceyyoshima, Tim te Beek, Tyler Van Gorder, Yifeng Jin, Adam Slaski, Aaron Gershman, Daryl Robbins, Patrick, Tim te Beek, Aaron Gershman, Michael Keppler, Kun Li, Aakarshit Uppal, BramliAK, Shannon Pamperl, eocantu, Laurens Westerlaken, Tracey Yoshima, Kun Li, Josh Soref