Failed to run on Java 21

[anbusampath]

Execution default-cli of goal se.kth.castor:depclean-maven-plugin:2.0.6:depclean failed: Unsupported class file major version 65

[andresnssbx]

@anbusampath did you find any solution?

[jwachter]

One solution you should be able to use is to manage the plugin (temporarily) in your project and define newer Versions of the ASM Libraries as direct plugin dependencies. As the error only stems from ASM not being able to read the newer bytecode it is enough to use an up-to-date version that supports the newer bytecode levels.

<pluginManagement>
      <plugins>
        <plugin>
          <groupId>se.kth.castor</groupId>
          <artifactId>depclean-maven-plugin</artifactId>
          <version>2.0.6</version>
          <dependencies>
            <dependency>
                <groupId>org.ow2.asm</groupId>
                <artifactId>asm-util</artifactId>
                <version>9.7</version>
            </dependency>
            <dependency>
                <groupId>org.ow2.asm</groupId>
                <artifactId>asm-tree</artifactId>
                <version>9.7</version>
            </dependency>
            <dependency>
                <groupId>org.ow2.asm</groupId>
                <artifactId>asm-commons</artifactId>
                <version>9.7</version>
            </dependency>
            <dependency>
                <groupId>org.ow2.asm</groupId>
                <artifactId>asm</artifactId>
                <version>9.7</version>
            </dependency>
          </dependencies>
        </plugin>
  ...
  </plugins>
</pluginManagement>