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import org.spongepowered.api.command.Command;

public Command.Parameterized buildCommand(){
    return Command
        .builder()
        .executor(new HelloWorldCommand())
        .permission("myplugin.command.helloWorld")
        .shortDescription(Component.text("Hello World Command"))
        .build();
}

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public Command.Parameterized buildCommand(){
    return Command
        .builder()
        .executor(new HelloWorldCommand())
        .permission("myplugin.command.helloWorld")
        .shortDescription(Component.text("Hello World Command"))
        .executionRequirements(context -> context.cause().root() instanceof ServerPlayer)
        .build();
}

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import org.spongepowered.api.command.CommandResult;
import org.spongepowered.api.command.parameter.CommandContext;
import org.spongepowered.api.command.CommandExecutor;
import org.spongepowered.api.command.exception.CommandException;

public class HelloWorldCommand implements CommandExecutor {

    @Override
    public CommandResult execute(CommandContext context) throws CommandException{
        context.sendMessage(Component.text("Hello World!"));
        return CommandResult.success();
    }

}

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CommandResult result = CommandResult.builder()
    .result(0)
    .error(Component.text("Hello world in error form"))
    .build();

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@Inject
PluginContainer container;

@Listener
public void onRegisterCommands(final RegisterCommandEvent<Command.Parameterized> event){
  event.register(this.container, buildCommand(), "helloworld", "hello", "test");
}

@Listener
public void onRegisterRawCommands(final RegisterCommandEvent<Command.Raw> event){
  event.register(this.container, new MyRawCommand(), "raw");
}