Find the oldest Java version in use

org.openrewrite.java.search.HasMinimumJavaVersion

The oldest Java version in use is the lowest Java version in use in any source set of any subproject of a repository. It is possible that, for example, the main source set of a project uses Java 8, but a test source set uses Java 17. In this case, the oldest Java version in use is Java 8.

Recipe source

GitHub, Issue Tracker, Maven Central

• groupId: org.openrewrite

• artifactId: rewrite-java

• version: 8.24.0

Options

Type	Name	Description	Example
String	version	An exact version number or node-style semver selector used to select the version number.	17.X
Boolean	checkTargetCompatibility	Optional. The source and target compatibility versions can be different. This option allows you to check against the target compatibility version instead of the source compatibility version.	17.X

Usage

This recipe has required configuration parameters. Recipes with required configuration parameters cannot be activated directly. To activate this recipe you must create a new recipe which fills in the required parameters. In your rewrite.yml create a new recipe with a unique name. For example: com.yourorg.HasMinimumJavaVersionExample. Here's how you can define and customize such a recipe within your rewrite.yml:

rewrite.yml

---
type: specs.openrewrite.org/v1beta/recipe
name: com.yourorg.HasMinimumJavaVersionExample
displayName: Find the oldest Java version in use example
recipeList:
  - org.openrewrite.java.search.HasMinimumJavaVersion:
      version: 17.X
      checkTargetCompatibility: 17.X

Now that com.yourorg.HasMinimumJavaVersionExample has been defined activate it in your build file:

Gradle

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

build.gradle

plugins {
    id("org.openrewrite.rewrite") version("6.12.0")
}

rewrite {
    activeRecipe("com.yourorg.HasMinimumJavaVersionExample")
}

repositories {
    mavenCentral()
}

2. Run gradle rewriteRun to run the recipe.

Maven

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>5.29.0</version>
        <configuration>
          <activeRecipes>
            <recipe>com.yourorg.HasMinimumJavaVersionExample</recipe>
          </activeRecipes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

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

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 HasMinimumJavaVersionExample

See how this recipe works across multiple open-source repositories

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