diff --git a/build.gradle b/build.gradle
index 548a252..4fd7443 100644
--- a/build.gradle
+++ b/build.gradle
@@ -30,8 +30,8 @@ subprojects {
     }
 
     java {
-        sourceCompatibility = JavaVersion.VERSION_17
-        targetCompatibility = JavaVersion.VERSION_17
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
 //        withJavadocJar()
         withSourcesJar()
     }
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/lore/LoreCustomModelDataCommand.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/lore/LoreCustomModelDataCommand.java
index 9f2633f..f5dafc7 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/lore/LoreCustomModelDataCommand.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/lore/LoreCustomModelDataCommand.java
@@ -42,10 +42,11 @@ public class LoreCustomModelDataCommand extends ChildCommand {
     @SuppressWarnings("deprecation")
     @Override
     public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
-        if (!(sender instanceof Player player)) {
+        if (!(sender instanceof Player)) {
             CoreMessage.COMMAND_MUST_USED_BY_PLAYER.show(sender);
             return true;
         }
+        Player player = (Player) sender;
         ItemStack stack = player.getItemInHand();
         if (BukkitUtils.isEmptyItemStack(stack)) {
             CoreMessage.COMMAND_LORE_HAND_EMPTY.show(player);
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/ButtonGroup.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/ButtonGroup.java
index 975e204..aa15ff6 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/ButtonGroup.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/ButtonGroup.java
@@ -169,7 +169,8 @@ public class ButtonGroup {
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof ButtonGroup that)) return false;
+        if (o == null || getClass() != o.getClass()) return false;
+        ButtonGroup that = (ButtonGroup) o;
         return name.equals(that.name);
     }
 
diff --git a/hamster-core-bukkit/src/main/resources/PageablePage.yml b/hamster-core-bukkit/src/main/resources/PageablePage.yml
index 6fbaf9b..b9f7d1b 100644
--- a/hamster-core-bukkit/src/main/resources/PageablePage.yml
+++ b/hamster-core-bukkit/src/main/resources/PageablePage.yml
@@ -11,6 +11,8 @@ graphic:
 groups:
   default:
     '#': "barrier"
+    '<': "preview"
+    '>': "next"
     '1': "element"
 
 sounds: