My command DSL

CommandDSL.java

binder.put("character", Commands.new("character", (c) -> c
        .withSub("customize", (sub) -> sub.to(CustomizeAction.class))
        .withSub("remove", (sub) -> sub
            .to(RemoveAction.class)
            .withArg("definitly", "yes", "no")) //equals withRequiredArg("state" new String[] { "on", "off" })
        .withSub("reload", (sub) -> sub.to(ReloadAction.class))
        .iff(GmLevelCondition.class);
        .withAliases("!personnage", "!joueur"));

//!character -customize
//!character -remove (-definitly(yes/no))
//!character -reload
        
binder.put("kolizeum", Commands.new("kolizeum", (c) -> c //possible without action, !kolizeum will return an error syntax
        .withRequiredArg("state", "on", "off") //required
        .withArg("group", "yes", "no"));
        
//!kolizeum -state(on/off) -group(yes/no)

binder.put("world", Commands.new("world", (c) -> c
        .to(SpeakToWorldAction.class)
        .withSpacedRequiredArg("message")); //note spaced allows an argument with spaces (need to be at the last arg)

//!world #message