Creating CommandBlock commands?

How to create commands like /testforblock one?
If it find that block from command then comparator connected to block will start giving power, if there is no block then it stops giving power.
Any ideas?



EDIT:
return false -> don't work, comparator is still powered.
throw new CommandException(); -> work, but... that exception, so I have big errors in console <3
Any ideas how to fix that?


EDIT2:
Creating own exception (with always return empty StackTrace) giving better results, but that still don't look good

Code:

[12:46:14 WARN]: CommandBlock at (-866,127,-739) failed to handle command
org.bukkit.command.CommandException: Unhandled exception executing command 'cbaisn' in plugin AutoIn_BukkitSmerf v1.9-beta
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181) ~[spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.CommandBlockListenerAbstract.a(CommandBlockListenerAbstract.java:172) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.BlockCommand.a(BlockCommand.java:47) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.WorldServer.a(WorldServer.java:569) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.WorldServer.doTick(WorldServer.java:211) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:690) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
Caused by: com.gmail.bukkitsmerf.autoin.EmtpyException: This error is fine, just ignore it <3

 

So Smerfa you're trying to recreate command block commands in your plugin?

 

I just want create command like
/testplayer <nickname>
and if you run it from CommandBlock then comparator will turn on if my code return true, and turn off if my code return false. like tihs /testforblock one

;/

 

why do you want to do that with a comparator Smerfa?

 

eeem, because that how vanilla minecraft works

 

So lemme get this strait. You want to use bukkit but for vanilla?

Code:java

boolean b = new Boolean(config.getInt("boolean"));
//cause  im to swaggy to get null pointer exceptions

 

meh, I just want that command
Bukkit API is sooooooo small ;/