build: Change to java 17

Core/build.gradle.kts

@@ -67,10 +67,10 @@ dependencies {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
+        languageVersion.set(JavaLanguageVersion.of(17))
     }
 }
 

Core/src/main/java/com/readutf/inari/core/arena/meta/ArenaMeta.java

@@ -10,6 +10,7 @@
 @Getter
 public class ArenaMeta {
 
+
     private final String name;
     private final String description;
     private final MaterialData materialData;

Development/build.gradle.kts

@@ -72,7 +72,7 @@ publishing {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
+        languageVersion.set(JavaLanguageVersion.of(17))
     }
 }
 

Development/src/main/java/com/readutf/inari/test/games/bedwars/generator/GeneratorListeners.java

@@ -53,7 +53,7 @@ public void onItemPickup(EntityPickupItemEvent e) {
                     pickupPlayers = new ArrayList<>(nearbyPlayers);
                 }
 
-                Player pickedPlayer = pickupPlayers.getFirst();
+                Player pickedPlayer = pickupPlayers.get(0);
                 pickedPlayer.getInventory().addItem(itemStack);
                 history.add(pickedPlayer.getUniqueId());
                 pickupHistory.put(itemStack.getType(), history);

Development/src/main/java/com/readutf/inari/test/games/sumo/SumoListeners.java

@@ -171,7 +171,7 @@ public void onQuit(PlayerQuitEvent e) {
         System.out.println("added with debug");
 
         if(game.getAliveTeams().size() == 1) {
-            game.endGame(game.getAliveTeams().getFirst(), GameEndReason.ENEMIES_ELIMINATED);
+            game.endGame(game.getAliveTeams().get(0), GameEndReason.ENEMIES_ELIMINATED);
         } else if(game.getAliveTeams().isEmpty()) {
             game.endGame(null, GameEndReason.DRAW);
         }

jitpack.yml

@@ -1,2 +1,2 @@
 jdk:
-  - openjdk21
+  - openjdk17