Read Kotlin object instances without kotlin-reflect

src/main/kotlin/net/shadowfacts/forgelin/KotlinAdapter.kt

@@ -7,6 +7,7 @@ import cpw.mods.fml.relauncher.Side
 import org.apache.logging.log4j.LogManager
 import java.lang.reflect.Field
 import java.lang.reflect.Method
+import java.lang.reflect.Modifier
 
 /**
  * Forge {@link ILanguageAdapter} for Kotlin
@@ -31,7 +32,21 @@ class KotlinAdapter : ILanguageAdapter {
 
 	override fun getNewInstance(container: FMLModContainer, objectClass: Class<*>, classLoader: ClassLoader, factoryMarkedAnnotation: Method?): Any {
 		log.debug("FML has asked for ${objectClass.simpleName} to be constructed")
-		return objectClass.kotlin.objectInstance ?: objectClass.newInstance()
+		return declaredObjectInstance(objectClass) ?: objectClass.kotlin.objectInstance ?: objectClass.newInstance()
+	}
+
+	// A Kotlin object is a class with a static INSTANCE of itself and no public constructor. Reading that field
+	// directly saves starting up kotlin-reflect just to find it.
+	private fun declaredObjectInstance(objectClass: Class<*>): Any? {
+		val field = try {
+			objectClass.getDeclaredField("INSTANCE")
+		} catch (e: NoSuchFieldException) {
+			return null
+		}
+		if (field.type != objectClass || !Modifier.isStatic(field.modifiers)) return null
+		if (objectClass.declaredConstructors.any { Modifier.isPublic(it.modifiers) }) return null
+		field.isAccessible = true
+		return field.get(null)
 	}
 
 	override fun setInternalProxies(mod: ModContainer?, side: Side?, loader: ClassLoader?) {