Add reflection utilities

src/main/kotlin/net/axay/kspigot/commands/BrigardierSupport.kt

@@ -8,6 +8,7 @@ import net.axay.kspigot.annotations.NMS_1_17
 import net.axay.kspigot.annotations.NMS_General
 import net.axay.kspigot.extensions.onlinePlayers
 import net.axay.kspigot.extensions.server
+import net.axay.kspigot.utils.reflectField
 import net.minecraft.commands.CommandListenerWrapper
 import org.bukkit.craftbukkit.v1_17_R1.CraftServer
 import org.bukkit.craftbukkit.v1_17_R1.entity.CraftPlayer
@@ -39,10 +40,7 @@ object BrigardierSupport {
     @NMS_1_17
     val commandDispatcher by lazy {
         // g = the command dispatcher
-        val dispatcherField = net.minecraft.commands.CommandDispatcher::class.java.getDeclaredField("g")
+        commandManager.reflectField<CommandDispatcher<CommandListenerWrapper>>("g")
-        dispatcherField.isAccessible = true
-        @Suppress("UNCHECKED_CAST")
-        dispatcherField.get(commandManager) as CommandDispatcher<CommandListenerWrapper>
     }
 
     @NMS_General

src/main/kotlin/net/axay/kspigot/utils/ReflectionExtensions.kt

@@ -0,0 +1,11 @@
+package net.axay.kspigot.utils
+
+/**
+ * Loads the value of the given field for this object.
+ */
+fun <T> Any.reflectField(field: String): T {
+    val reflectedField = this::class.java.getDeclaredField(field)
+    reflectedField.isAccessible = true
+    @Suppress("UNCHECKED_CAST")
+    return reflectedField.get(this) as T
+}