made mod build on java 21

build.gradle

@@ -5,6 +5,12 @@ plugins {
     id 'idea'
 }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}
+
 version = "1.10.2"
 group= "kamkeel.customnpc-plus"
 archivesBaseName = "CustomNPC-Plus"

src/main/java/noppes/npcs/controllers/ScriptContainer.java

@@ -1,13 +1,13 @@
 package noppes.npcs.controllers;
 
 import cpw.mods.fml.common.eventhandler.Event;
-import jdk.nashorn.api.scripting.ScriptObjectMirror;
 import net.minecraft.nbt.NBTTagCompound;
 import noppes.npcs.NBTTags;
 import noppes.npcs.config.ConfigScript;
 import noppes.npcs.constants.EnumScriptType;
 import noppes.npcs.controllers.data.IScriptHandler;
 import noppes.npcs.scripted.NpcAPI;
+import org.openjdk.nashorn.api.scripting.ScriptObjectMirror;
 
 import javax.script.*;
 import java.io.PrintWriter;

src/main/java/noppes/npcs/controllers/ScriptController.java

@@ -1,8 +1,6 @@
 package noppes.npcs.controllers;
 
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
-import jdk.nashorn.api.scripting.ClassFilter;
-import jdk.nashorn.api.scripting.NashornScriptEngineFactory;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
@@ -21,6 +19,8 @@ import noppes.npcs.entity.EntityNPCInterface;
 import noppes.npcs.scripted.ScriptWorld;
 import noppes.npcs.util.JsonException;
 import noppes.npcs.util.NBTJsonUtil;
+import org.openjdk.nashorn.api.scripting.ClassFilter;
+import org.openjdk.nashorn.api.scripting.NashornScriptEngineFactory;
 
 import javax.script.ScriptContext;
 import javax.script.ScriptEngine;