Java 21/25 Migration Roadmap

<properties>
  <maven.compiler.release>21</maven.compiler.release>
</properties>

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-toolchains-plugin</artifactId>
      <version>3.2.0</version>
      <executions>
        <execution>
          <goals><goal>toolchain</goal></goals>
        </execution>
      </executions>
      <configuration>
        <toolchains>
          <jdk>
            <version>21</version>
            <vendor>any</vendor>
          </jdk>
        </toolchains>
      </configuration>
    </plugin>
  </plugins>
</build>

public sealed interface MigrationRisk permits BuildRisk, RuntimeRisk, LibraryRisk {}

public record BuildRisk(String plugin, String reason) implements MigrationRisk {}
public record RuntimeRisk(String component, String reason) implements MigrationRisk {}
public record LibraryRisk(String dependency, String reason) implements MigrationRisk {}

public static String owner(MigrationRisk risk) {
    return switch (risk) {
        case BuildRisk ignored -> "Build/CI Team";
        case RuntimeRisk ignored -> "Platform Team";
        case LibraryRisk ignored -> "Application Team";
    };
}