When installing coc-java, coc cannot define java environment

Question

I have installed coc for neovim, after that I ran the command to install coc-java:

:CocInstall coc-java

Then configured coc-settings.json which is in ~/.config/nvim folder:

    "java.configuration.runtimes": [
      {
        "name": "JavaSE-21",
        "path": "/usr/lib/jvm/jdk-21.0.2",
        "default": true
      }
    ]

The jdk is truly lying at the path above, however, Coc spits this error when opening a java file:

Invalid runtime for JavaSE-21: Runtime at '/usr/lib/jvm/jdk-21.0.2' is not compatible with the 'JavaSE-21' environment.

I'm following the original tutorial of the author of coc-java on how to set up an environment. I'm using neovim as the text editor, please help me solve it