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I executed this command:

/execute ae42a5d0-0aa2-34ce-97d6-7b6ee3e07e5a ~ ~ ~ /tellraw @p ["", {"text":"hello. your score is ","bold":true,"italic":true,"strikethrough":false,"underlined":true,"obfuscated":false,"color":"gray","clickEvent":{"action":"run_command","value":"/say this works"}}, {"score":{"name":"ydStudent","objective":"score"},"bold":true,"italic":true,"strikethrough":false,"underlined":true,"obfuscated":false,"color":"gray","hoverEvent":{"action":"show_text","value":"get more score."}}]

(computer generated)

using this code:

/**
	 * Execute a command as the specified entity.
	 * 
	 * @param command
	 * @param source
	 */
	public static String executeCommandAsEntity(String command, Entity source) {
		String commandToUse = "";
		if (!source.world.isRemote) {
			//Minecraft.getMinecraft().player.sendChatMessage("/execute " + source.getUniqueID() + " ~ ~ ~ " + command);
			commandToUse = "/execute " + source.getUniqueID() + " ~ ~ ~ " + command;
			Minecraft.getMinecraft().getIntegratedServer().getCommandManager().executeCommand(Minecraft.getMinecraft().player.getCommandSenderEntity(), commandToUse);
		} else {
			return null;
		}
		
		return commandToUse;
	}

(this is the same way command blocks do it)

When running this as the player, I get a null pointer exception with a description of null. Stacktrace:

java.lang.NullPointerException: null
	at net.minecraft.command.EntitySelector.getWorlds(EntitySelector.java:233) ~[EntitySelector.class:?]
	at net.minecraft.command.EntitySelector.matchEntities(EntitySelector.java:154) ~[EntitySelector.class:?]
	at net.minecraft.command.EntitySelector.matchOneEntity(EntitySelector.java:108) ~[EntitySelector.class:?]
	at net.minecraft.command.EntitySelector.matchOnePlayer(EntitySelector.java:93) ~[EntitySelector.class:?]
	at net.minecraft.command.CommandBase.getPlayer(CommandBase.java:271) ~[CommandBase.class:?]
	at net.minecraft.command.server.CommandMessageRaw.execute(CommandMessageRaw.java:54) ~[CommandMessageRaw.class:?]
	at net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:126) [CommandHandler.class:?]
	at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:98) [CommandHandler.class:?]
	at net.minecraft.command.CommandExecuteAt.execute(CommandExecuteAt.java:93) [CommandExecuteAt.class:?]
	at net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:126) [CommandHandler.class:?]
	at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:98) [CommandHandler.class:?]
	at mymod.CommandHelper.executeCommandAsEntity(CommandHelper.java:32) [CommandHelper.class:?]
	at mymod.CommandHelper.tellRaw(CommandHelper.java:276) [CommandHelper.class:?]
	at mymod.items.MyItem2.onItemRightClick(MyItem2.java:74) [MyItem2.class:?]
	at net.minecraft.item.ItemStack.useItemRightClick(ItemStack.java:234) [ItemStack.class:?]
	at net.minecraft.client.multiplayer.PlayerControllerMP.processRightClick(PlayerControllerMP.java:542) [PlayerControllerMP.class:?]
	at net.minecraft.client.Minecraft.rightClickMouse(Minecraft.java:1692) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.processKeyBinds(Minecraft.java:2361) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.runTickKeyboard(Minecraft.java:2127) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1915) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1171) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.run(Minecraft.java:436) [Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_141]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_141]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_141]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_141]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_141]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_141]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_141]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_141]
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
	at GradleStart.main(GradleStart.java:26) [start/:?]

The line of code where it came is this:

Collections.addAll(list, sender.getServer().worlds);

inside of EntitySelector.java in the function getWorlds which is this:

/**
     * Returns the worlds to match the entities in for the specified command sender and token. This returns the sender's
     * world if the selector specifies a location or all currently loaded worlds on the server if not.
     */
    private static List<World> getWorlds(ICommandSender sender, Map<String, String> argumentMap)
    {
        List<World> list = Lists.<World>newArrayList();

        if (hasArgument(argumentMap))
        {
            list.add(sender.getEntityWorld());
        }
        else
        {
            Collections.addAll(list, sender.getServer().worlds);
        }

        return list;
    }

This command works perfectly when I place it into a command block.

I have tried changing the selector to @s, with the same result. The order that the json is generated doesn't seem to matter. Switching my code to only run on the server didn't change anything.

Can you help me?

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