Downgrade to java 21

build.gradle

@@ -25,7 +25,7 @@ compileTestJava.options.encoding = "UTF-8"
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(25)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }
 

src/main/java/emu/nebula/server/HttpServer.java

@@ -84,7 +84,7 @@ public class HttpServer {
         }
         
         // Exception handler
-        getApp().exception(Exception.class, (e, _) -> {
+        getApp().exception(Exception.class, (e, c) -> {
             e.printStackTrace();
         });