Need basic usage guide

[YAS-CODE]

Hello Guys, I am trying to test this java-langserver, Please guide me how i can run a basic java example on it, i am trying to run websocket version, After successful installations, I am using this command to run it "java -cp target/java-language-server.jar com.sourcegraph.langserver.App2"

Please also inform me how i should configure client side like for:
serverUri: 'ws://localhost:2088/java',
languageId: 'java',
rootUri: , documentUri: ,
documentText: () => htmlEditor.getValue(),

Any help would be appriciated...
Many Thanks