NPE when getting value from config

Im trying to get a value from the config in a separate class from main, but it keeps coming up with a null pointer exception. Here is my onEnable, the separate class, and the stacktrace:

Code:

   public void onEnable() {
    setupConfig();
    shopmeta.setDisplayName(ChatColor.BLUE + "" + ChatColor.BOLD + "Cosmetics");
    shop.setItemMeta(shopmeta);
    prefsmeta.setDisplayName(ChatColor.GREEN + "" + ChatColor.BOLD + "Settings");
    prefs.setItemMeta(prefsmeta);
    plugin = this;
    ListenerJoin lj = new ListenerJoin(this);
    sim = new ShopInventoryManager(this);
    pim = new PrefsInventoryManager(this);
    for (Player p : Bukkit.getOnlinePlayers()) {
        lj.checkPlayersStuff(p);
    }
    new Listeners(this);
    new JumpingManager(this);
    ssm = new ServerSelectionManager(this);
    sql = new SQL(this);
    sql.openConnection();    

Code:

public class SQL {
    MainHub pl;

    public SQL(MainHub plugin) {
    pl = plugin;
    }

    private String hostIP = "jdbc:mysql://" + pl.
        getConfig().
        getString("host");
    private String port = pl.getConfig().getString("port");
    private String name = pl.getConfig().getString("name");
    private String uuidField = "uuid";
    private String tableName = "ml_shop";

Code:

[01:55:00] [Server thread/ERROR]: Error occurred while enabling Hub version Beta 1.0 (Is it up to date?)
java.lang.NullPointerException
    at me.BobTheFish.Hub.SQL.<init>(SQL.java:19) ~[?:?]
    at me.BobTheFish.Hub.MainHub.onEnable(MainHub.java:53) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:417) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.java:476) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.java:394) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.reload(CraftServer.java:866) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.Bukkit.reload(Bukkit.java:301) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServer.java:767) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerConnection.java:1043) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:880) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java:28) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat.java:65) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]
    at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [server.jar:git-Spigot-1.7.9-R0.2-204-g534549b]

EDIT: Line 53 of MainHub is sql = new SQL(this); and line 19 in SQL is getConfig().

 

@bobthefish

Because you initialise the values from SQL in the clinit, instead of in the constructor, where the value of plugin isn't null.

 

Im not sure I understand completely
@mythbusterma, but do you mean I need to put the actual values in the constructor for the class?

something like

Code:

String host;

public SQL(MainHub pl){

host = ....;
}

?

 

@bobthefish

That would be one way to fix it, yes.