Solved how to get an array from config.yml

Hello.
It has the following config.yml file:

Code:

emerald:
'1':
- 695
- 64
- 278
'2':
- 695
- 64
- 279
iron:
'1':
- 694
- 64
- 279
coal:
'1':
- 694
- 64
- 281

I check every emerald block that exists in config.yml
For example, emerald 1 should turn out to be [695, 64, 278]. And so check all the emerald blocks.

Maybe I'm writing the data in config.yml incorrectly

My code:

Code:

List<String> values = new ArrayList<String>();
for (String x : getConfig().getConfigurationSection("emerald").getKeys(false))
            {
                for(String y: getConfig().getConfigurationSection("emerald."+x).getKeys(false))
                {
                    values.add(y);
                }
            }

but, I get an errore:

Code:

[22:43:45] [Server thread/ERROR]: Could not pass event BlockBreakEvent to Shaft v1.0
org.bukkit.event.EventException: null
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-Spigot-dcd1643-e60fc34]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-Spigot-dcd1643-e60fc34]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [server.jar:git-Spigot-dcd1643-e60fc34]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.PlayerInteractManager.breakBlock(PlayerInteractManager.java:290) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.PlayerInteractManager.a(PlayerInteractManager.java:123) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:877) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.PacketPlayInBlockDig.a(SourceFile:40) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.PacketPlayInBlockDig.a(SourceFile:10) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-Spigot-dcd1643-e60fc34]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
    at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [server.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [server.jar:git-Spigot-dcd1643-e60fc34]
    at java.lang.Thread.run(Thread.java:831) [?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "org.bukkit.configuration.ConfigurationSection.getKeys(boolean)" because the return value of "org.bukkit.configuration.file.FileConfiguration.getConfigurationSection(String)" is null
    at net.quantico.shaft.Main.onBlockBreak(Main.java:112) ~[?:?]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[?:?]
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server.jar:git-Spigot-dcd1643-e60fc34]
    ... 17 more

Thank you in advance for your help.
I appreciate your time.

 

You can directly derive a list from a config file of type String or Integer by using 'config.getStringList(PATH)' or 'config.getIntegerList(PATH)'.