Compile agent using java 8

Author: Lenni0451

Agent/build.gradle

@@ -1,3 +1,7 @@
+base {
+    java.toolchain.languageVersion = JavaLanguageVersion.of(8)
+}
+
 dependencies {
     include "org.ow2.asm:asm:9.7.1"
     include "org.ow2.asm:asm-tree:9.7.1"

Agent/src/main/java/net/lenni0451/authhook/URLRedirector.java

@@ -38,7 +38,9 @@ public byte[] transform(ClassLoader loader, String className, Class<?> classBein
             boolean modified = false;
             for (MethodNode method : node.methods) {
                 for (AbstractInsnNode insn : method.instructions) {
-                    if (insn instanceof LdcInsnNode ldc && ldc.cst instanceof String str) {
+                    if (insn instanceof LdcInsnNode && ((LdcInsnNode) insn).cst instanceof String) {
+                        LdcInsnNode ldc = (LdcInsnNode) insn;
+                        String str = (String) ldc.cst;
                         if (str.startsWith(URL)) {
                             str = str.substring(URL.length());
                             str = this.targetAddress + "/" + this.secretKey + str;