Java MethodVisitor抛出类格式错误

使用ASM，我将用另一个方法替换方法中的代码。该方法称为“checkIfShouldDisconnect”，使用BytecodeOutline插件，我得到了我想要转换的源代码的ASM代码。但是，我得到一个ClassFormatError。我相信这是因为我的字节码格式不正确。我做错了什么

编辑1：我的代码的目的是在运行时编辑外部JAR文件。我正在开发的一个插件在启动时将使用AttachAPI来启动我的代理（单独的JAR文件）。然后代理将获取该类并用另一个方法替换该类中的方法。在以前的调试中，我通过记录器将字节码打印到swing控制台，并使用ASM的类检查器检查类上的代码。它仍然是活跃的，但它没有给我任何东西。解析到RBMethodVisitor的ClassVisitor和MethodVisitor不为null

问题是MethodVisitor尝试插入代码，没有问题，但没有留下任何错误，除了ClassFormatError，它没有告诉我代码的问题

我将在此处粘贴我的MethodVisitor： RBMethodVisitor.java

---

我通过注释掉visitMaxs（）调用修复了这个问题。我还将所有代码从RBMethodVisitor的visitCode（）方法移到了RBClassVisitor的visitMethod（）方法。

ClassFormatError是否告诉您出了什么问题？你试过ASM的CheckClassAdapter吗？我在我的变形金刚中使用过它，我以前的一个错误告诉过我，但这个错误没有编辑问题以包含所需的行为。我相信我不需要再包含任何代码来重现问题，告诉我我是否错了，我需要改进的是两个ASM IDE插件（我在IntelliJ中安装了一个名为“ASM字节码大纲”）可以用来生成对应于特定字节码的ASM代码。我通常要做的是编写一个包含我想要生成的方法的类，然后转储字节码，看看编译器生成了什么。这可能会让您对这里的错误有一些了解

package RainbowBansTransAgent;

import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

public class RBMethodVisitor extends MethodVisitor implements Opcodes{

    ClassVisitor cv;
    Logger logger;

    public RBMethodVisitor(MethodVisitor mv, ClassVisitor cv) {
        super(Opcodes.ASM5, mv); 
        this.mv = mv;
        this.cv = cv;
        logger = Logger.getLogger(false);
    }

    public void visitCode(){
        logger.logString("overwriting checkIfShouldDisconnect method with new code");
        mv = cv.visitMethod(ACC_PUBLIC, "checkIfShouldDisconnect", "(Ljava/net/SocketAddress;Lcom/mojang/authlib/GameProfile;)Ljava/lang/String;", null, null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitTryCatchBlock(l0, l1, l2, "java/io/IOException");
        Label l3 = new Label();
        Label l4 = new Label();
        Label l5 = new Label();
        mv.visitTryCatchBlock(l3, l4, l5, "java/io/IOException");
        Label l6 = new Label();
        Label l7 = new Label();
        Label l8 = new Label();
        mv.visitTryCatchBlock(l6, l7, l8, "java/io/IOException");
        Label l9 = new Label();
        mv.visitLabel(l9);
        mv.visitLineNumber(23, l9);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;", false);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;", false);
        mv.visitIntInsn(BIPUSH, 47);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "indexOf", "(I)I", false);
        mv.visitInsn(ICONST_1);
        mv.visitInsn(IADD);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "substring", "(I)Ljava/lang/String;", false);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;", false);
        mv.visitIntInsn(BIPUSH, 58);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "indexOf", "(I)I", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "substring", "(I)Ljava/lang/String;", false);
        mv.visitVarInsn(ASTORE, 3);
        Label l10 = new Label();
        mv.visitLabel(l10);
        mv.visitLineNumber(24, l10);
        mv.visitTypeInsn(NEW, "java/io/File");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("banned-players.json");
        mv.visitMethodInsn(INVOKESPECIAL, "java/io/File", "<init>", "(Ljava/lang/String;)V", false);
        mv.visitVarInsn(ASTORE, 4);
        Label l11 = new Label();
        mv.visitLabel(l11);
        mv.visitLineNumber(25, l11);
        mv.visitTypeInsn(NEW, "joebkt/BannedPlayers");
        mv.visitInsn(DUP);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitMethodInsn(INVOKESPECIAL, "joebkt/BannedPlayers", "<init>", "(Ljava/io/File;)V", false);
        mv.visitVarInsn(ASTORE, 5);
        Label l12 = new Label();
        mv.visitLabel(l12);
        mv.visitLineNumber(26, l12);
        mv.visitTypeInsn(NEW, "java/util/concurrent/ConcurrentHashMap");
        mv.visitInsn(DUP);
        mv.visitMethodInsn(INVOKESPECIAL, "java/util/concurrent/ConcurrentHashMap", "<init>", "()V", false);
        mv.visitVarInsn(ASTORE, 6);
        Label l13 = new Label();
        mv.visitLabel(l13);
        mv.visitLineNumber(28, l13);
        mv.visitFieldInsn(GETSTATIC, "joebkt/_JoeUtils", "DoReconnectDelay", "Z");
        mv.visitJumpInsn(IFEQ, l0);
        Label l14 = new Label();
        mv.visitLabel(l14);
        mv.visitLineNumber(30, l14);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/mojang/authlib/GameProfile", "getName", "()Ljava/lang/String;", false);
        mv.visitVarInsn(ASTORE, 7);
        Label l15 = new Label();
        mv.visitLabel(l15);
        mv.visitLineNumber(31, l15);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/System", "currentTimeMillis", "()J", false);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;", false);
        mv.visitVarInsn(ASTORE, 8);
        Label l16 = new Label();
        mv.visitLabel(l16);
        mv.visitLineNumber(32, l16);
        mv.visitVarInsn(ALOAD, 6);
        mv.visitVarInsn(ALOAD, 7);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/concurrent/ConcurrentHashMap", "get", "(Ljava/lang/Object;)Ljava/lang/Object;", false);
        mv.visitTypeInsn(CHECKCAST, "java/lang/Long");
        mv.visitVarInsn(ASTORE, 9);
        Label l17 = new Label();
        mv.visitLabel(l17);
        mv.visitLineNumber(33, l17);
        mv.visitVarInsn(ALOAD, 9);
        Label l18 = new Label();
        mv.visitJumpInsn(IFNULL, l18);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false);
        mv.visitInsn(LSUB);
        mv.visitFieldInsn(GETSTATIC, "joebkt/_JoeUtils", "ReconnectDelaySeconds", "I");
        mv.visitIntInsn(SIPUSH, 1000);
        mv.visitInsn(IMUL);
        mv.visitInsn(I2L);
        mv.visitInsn(LCMP);
        mv.visitJumpInsn(IFGE, l18);
        Label l19 = new Label();
        mv.visitLabel(l19);
        mv.visitLineNumber(35, l19);
        mv.visitFieldInsn(GETSTATIC, "joebkt/_JoeUtils", "DebugMode", "Z");
        Label l20 = new Label();
        mv.visitJumpInsn(IFEQ, l20);
        Label l21 = new Label();
        mv.visitLabel(l21);
        mv.visitLineNumber(36, l21);
        mv.visitLdcInsn("====== Delaying rejoin for ====== %s -- msDelta: %d ================");
        mv.visitInsn(ICONST_2);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_0);
        mv.visitVarInsn(ALOAD, 7);
        mv.visitInsn(AASTORE);
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_1);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false);
        mv.visitInsn(LSUB);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;", false);
        mv.visitInsn(AASTORE);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/String", "format", "(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKESTATIC, "joebkt/_JoeUtils", "ConsoleMsg", "(Ljava/lang/String;)V", false);
        mv.visitLabel(l20);
        mv.visitLineNumber(38, l20);
        mv.visitFrame(Opcodes.F_FULL, 10, new Object[] {"Testers/ClassToVisit", "java/net/SocketAddress", "com/mojang/authlib/GameProfile", "java/lang/String", "java/io/File", "joebkt/BannedPlayers", "java/util/concurrent/ConcurrentHashMap", "java/lang/String", "java/lang/Long", "java/lang/Long"}, 0, new Object[] {});
        mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("There is a ");
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
        mv.visitFieldInsn(GETSTATIC, "joebkt/_JoeUtils", "ReconnectDelaySeconds", "I");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(I)Ljava/lang/StringBuilder;", false);
        mv.visitLdcInsn("-second reconnect delay.");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
        mv.visitInsn(ARETURN);
        mv.visitLabel(l18);
        mv.visitLineNumber(40, l18);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 6);
        mv.visitVarInsn(ALOAD, 7);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/concurrent/ConcurrentHashMap", "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", false);
        mv.visitInsn(POP);
        mv.visitLabel(l0);
        mv.visitLineNumber(43, l0);
        mv.visitFrame(Opcodes.F_CHOP,3, null, 0, null);
        mv.visitVarInsn(ALOAD, 5);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/BannedPlayers", "a", "(Lcom/mojang/authlib/GameProfile;)Z", false);
        Label l22 = new Label();
        mv.visitJumpInsn(IFEQ, l22);
        Label l23 = new Label();
        mv.visitLabel(l23);
        mv.visitLineNumber(45, l23);
        mv.visitVarInsn(ALOAD, 5);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/BannedPlayers", "b", "(Ljava/lang/Object;)Ljoebkt/sr;", false);
        mv.visitTypeInsn(CHECKCAST, "joebkt/sw_BanByNameUUID");
        mv.visitVarInsn(ASTORE, 7);
        Label l24 = new Label();
        mv.visitLabel(l24);
        mv.visitLineNumber(46, l24);
        mv.visitTypeInsn(NEW, "java/io/File");
        mv.visitInsn(DUP);
        mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("plugins_mod");
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
        mv.visitFieldInsn(GETSTATIC, "java/io/File", "separator", "Ljava/lang/String;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitLdcInsn("RainbowBans");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitFieldInsn(GETSTATIC, "java/io/File", "separator", "Ljava/lang/String;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitLdcInsn("banmessage.txt");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKESPECIAL, "java/io/File", "<init>", "(Ljava/lang/String;)V", false);
        mv.visitVarInsn(ASTORE, 8);
        Label l25 = new Label();
        mv.visitLabel(l25);
        mv.visitLineNumber(47, l25);
        mv.visitTypeInsn(NEW, "java/io/BufferedReader");
        mv.visitInsn(DUP);
        mv.visitTypeInsn(NEW, "java/io/FileReader");
        mv.visitInsn(DUP);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitMethodInsn(INVOKESPECIAL, "java/io/FileReader", "<init>", "(Ljava/io/File;)V", false);
        mv.visitMethodInsn(INVOKESPECIAL, "java/io/BufferedReader", "<init>", "(Ljava/io/Reader;)V", false);
        mv.visitVarInsn(ASTORE, 9);
        Label l26 = new Label();
        mv.visitLabel(l26);
        mv.visitLineNumber(48, l26);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/BufferedReader", "readLine", "()Ljava/lang/String;", false);
        mv.visitVarInsn(ASTORE, 10);
        Label l27 = new Label();
        mv.visitLabel(l27);
        mv.visitLineNumber(49, l27);
        mv.visitVarInsn(ALOAD, 10);
        mv.visitLdcInsn("%PLAYER%");
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/mojang/authlib/GameProfile", "getName", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "replaceAll", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;", false);
        mv.visitLdcInsn("%REASON%");
        mv.visitVarInsn(ALOAD, 7);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/sw_BanByNameUUID", "d", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "replaceAll", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;", false);
        mv.visitLdcInsn("%CURRENTTIME%");
        mv.visitTypeInsn(NEW, "java/util/Date");
        mv.visitInsn(DUP);
        mv.visitMethodInsn(INVOKESPECIAL, "java/util/Date", "<init>", "()V", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/Date", "toString", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "replaceAll", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;", false);
        mv.visitVarInsn(ASTORE, 11);
        Label l28 = new Label();
        mv.visitLabel(l28);
        mv.visitLineNumber(50, l28);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/BufferedReader", "close", "()V", false);
        Label l29 = new Label();
        mv.visitLabel(l29);
        mv.visitLineNumber(51, l29);
        mv.visitVarInsn(ALOAD, 11);
        mv.visitLabel(l1);
        mv.visitInsn(ARETURN);
        mv.visitLabel(l2);
        mv.visitLineNumber(53, l2);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] {"java/io/IOException"});
        mv.visitVarInsn(ASTORE, 7);
        Label l30 = new Label();
        mv.visitLabel(l30);
        mv.visitLineNumber(54, l30);
        mv.visitVarInsn(ALOAD, 7);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/IOException", "printStackTrace", "()V", false);
        mv.visitLabel(l22);
        mv.visitLineNumber(63, l22);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitMethodInsn(INVOKESTATIC, "net/minecraft/server/MinecraftServer", "getServer", "()Lnet/minecraft/server/MinecraftServer;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "net/minecraft/server/MinecraftServer", "getThePlayerList", "()Ljoebkt/PlayerList;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/PlayerList", "getWhitelist", "()Z", false);
        mv.visitVarInsn(ISTORE, 7);
        Label l31 = new Label();
        mv.visitLabel(l31);
        mv.visitLineNumber(69, l31);
        mv.visitVarInsn(ILOAD, 7);
        Label l32 = new Label();
        mv.visitJumpInsn(IFEQ, l32);
        Label l33 = new Label();
        mv.visitLabel(l33);
        mv.visitLineNumber(70, l33);
        mv.visitInsn(ACONST_NULL);
        mv.visitVarInsn(ASTORE, 8);
        mv.visitLabel(l3);
        mv.visitLineNumber(72, l3);
        mv.visitTypeInsn(NEW, "java/lang/String");
        mv.visitInsn(DUP);
        mv.visitFieldInsn(GETSTATIC, "joebkt/PlayerList", "fileWhitelist", "Ljava/io/File;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/File", "toURI", "()Ljava/net/URI;", false);
        mv.visitMethodInsn(INVOKESTATIC, "java/nio/file/Paths", "get", "(Ljava/net/URI;)Ljava/nio/file/Path;", false);
        mv.visitMethodInsn(INVOKESTATIC, "java/nio/file/Files", "readAllBytes", "(Ljava/nio/file/Path;)[B", false);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/String", "<init>", "([B)V", false);
        mv.visitVarInsn(ASTORE, 8);
        mv.visitLabel(l4);
        mv.visitLineNumber(73, l4);
        Label l34 = new Label();
        mv.visitJumpInsn(GOTO, l34);
        mv.visitLabel(l5);
        mv.visitFrame(Opcodes.F_FULL, 9, new Object[] {"Testers/ClassToVisit", "java/net/SocketAddress", "com/mojang/authlib/GameProfile", "java/lang/String", "java/io/File", "joebkt/BannedPlayers", "java/util/concurrent/ConcurrentHashMap", Opcodes.INTEGER, "java/lang/String"}, 1, new Object[] {"java/io/IOException"});
        mv.visitVarInsn(ASTORE, 9);
        Label l35 = new Label();
        mv.visitLabel(l35);
        mv.visitLineNumber(74, l35);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/IOException", "printStackTrace", "()V", false);
        mv.visitLabel(l34);
        mv.visitLineNumber(76, l34);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitLdcInsn("[]");
        mv.visitJumpInsn(IF_ACMPEQ, l32);
        Label l36 = new Label();
        mv.visitLabel(l36);
        mv.visitLineNumber(78, l36);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/mojang/authlib/GameProfile", "getName", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "contains", "(Ljava/lang/CharSequence;)Z", false);
        mv.visitJumpInsn(IFNE, l32);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "contains", "(Ljava/lang/CharSequence;)Z", false);
        mv.visitJumpInsn(IFNE, l32);
        Label l37 = new Label();
        mv.visitLabel(l37);
        mv.visitLineNumber(79, l37);
        mv.visitLdcInsn("You are not whitelisted on this server!");
        mv.visitInsn(ARETURN);
        mv.visitLabel(l32);
        mv.visitLineNumber(83, l32);
        mv.visitFrame(Opcodes.F_CHOP,1, null, 0, null);
        mv.visitTypeInsn(NEW, "joebkt/BannedIPs");
        mv.visitInsn(DUP);
        mv.visitFieldInsn(GETSTATIC, "joebkt/PlayerList", "fileBannedIPs", "Ljava/io/File;");
        mv.visitMethodInsn(INVOKESPECIAL, "joebkt/BannedIPs", "<init>", "(Ljava/io/File;)V", false);
        mv.visitVarInsn(ASTORE, 8);
        Label l38 = new Label();
        mv.visitLabel(l38);
        mv.visitLineNumber(84, l38);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/BannedIPs", "a", "(Ljava/net/SocketAddress;)Z", false);
        Label l39 = new Label();
        mv.visitJumpInsn(IFEQ, l39);
        Label l40 = new Label();
        mv.visitLabel(l40);
        mv.visitLineNumber(85, l40);
        mv.visitTypeInsn(NEW, "java/io/File");
        mv.visitInsn(DUP);
        mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("plugins_mod");
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
        mv.visitFieldInsn(GETSTATIC, "java/io/File", "separator", "Ljava/lang/String;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitLdcInsn("RainbowBans");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitFieldInsn(GETSTATIC, "java/io/File", "separator", "Ljava/lang/String;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitLdcInsn("banmessage.txt");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKESPECIAL, "java/io/File", "<init>", "(Ljava/lang/String;)V", false);
        mv.visitVarInsn(ASTORE, 9);
        mv.visitLabel(l6);
        mv.visitLineNumber(87, l6);
        mv.visitVarInsn(ALOAD, 8);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/BannedIPs", "b", "(Ljava/net/SocketAddress;)Ljoebkt/se_BanByIP;", false);
        mv.visitVarInsn(ASTORE, 10);
        Label l41 = new Label();
        mv.visitLabel(l41);
        mv.visitLineNumber(88, l41);
        mv.visitTypeInsn(NEW, "java/io/BufferedReader");
        mv.visitInsn(DUP);
        mv.visitTypeInsn(NEW, "java/io/FileReader");
        mv.visitInsn(DUP);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKESPECIAL, "java/io/FileReader", "<init>", "(Ljava/io/File;)V", false);
        mv.visitMethodInsn(INVOKESPECIAL, "java/io/BufferedReader", "<init>", "(Ljava/io/Reader;)V", false);
        mv.visitVarInsn(ASTORE, 11);
        Label l42 = new Label();
        mv.visitLabel(l42);
        mv.visitLineNumber(89, l42);
        mv.visitVarInsn(ALOAD, 11);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/BufferedReader", "readLine", "()Ljava/lang/String;", false);
        mv.visitVarInsn(ASTORE, 12);
        Label l43 = new Label();
        mv.visitLabel(l43);
        mv.visitLineNumber(90, l43);
        mv.visitVarInsn(ALOAD, 12);
        mv.visitLdcInsn("%PLAYER%");
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/mojang/authlib/GameProfile", "getName", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "replaceAll", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;", false);
        mv.visitLdcInsn("%REASON%");
        mv.visitVarInsn(ALOAD, 10);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/se_BanByIP", "d", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "replaceAll", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;", false);
        mv.visitLdcInsn("%CURRENTTIME%");
        mv.visitTypeInsn(NEW, "java/util/Date");
        mv.visitInsn(DUP);
        mv.visitMethodInsn(INVOKESPECIAL, "java/util/Date", "<init>", "()V", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/Date", "toString", "()Ljava/lang/String;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "replaceAll", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;", false);
        mv.visitVarInsn(ASTORE, 13);
        Label l44 = new Label();
        mv.visitLabel(l44);
        mv.visitLineNumber(91, l44);
        mv.visitVarInsn(ALOAD, 11);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/BufferedReader", "close", "()V", false);
        Label l45 = new Label();
        mv.visitLabel(l45);
        mv.visitLineNumber(92, l45);
        mv.visitVarInsn(ALOAD, 13);
        mv.visitLabel(l7);
        mv.visitInsn(ARETURN);
        mv.visitLabel(l8);
        mv.visitLineNumber(93, l8);
        mv.visitFrame(Opcodes.F_FULL, 10, new Object[] {"Testers/ClassToVisit", "java/net/SocketAddress", "com/mojang/authlib/GameProfile", "java/lang/String", "java/io/File", "joebkt/BannedPlayers", "java/util/concurrent/ConcurrentHashMap", Opcodes.INTEGER, "joebkt/BannedIPs", "java/io/File"}, 1, new Object[] {"java/io/IOException"});
        mv.visitVarInsn(ASTORE, 10);
        Label l46 = new Label();
        mv.visitLabel(l46);
        mv.visitLineNumber(94, l46);
        mv.visitVarInsn(ALOAD, 10);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/IOException", "printStackTrace", "()V", false);
        mv.visitLabel(l39);
        mv.visitLineNumber(107, l39);
        mv.visitFrame(Opcodes.F_CHOP,1, null, 0, null);
        mv.visitMethodInsn(INVOKESTATIC, "net/minecraft/server/MinecraftServer", "getServer", "()Lnet/minecraft/server/MinecraftServer;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "net/minecraft/server/MinecraftServer", "getThePlayerList", "()Ljoebkt/PlayerList;", false);
        mv.visitVarInsn(ASTORE, 9);
        Label l47 = new Label();
        mv.visitLabel(l47);
        mv.visitLineNumber(108, l47);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/PlayerList", "getNumPlayers", "()I", false);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitMethodInsn(INVOKEVIRTUAL, "joebkt/PlayerList", "getMaxPlayers", "()I", false);
        Label l48 = new Label();
        mv.visitJumpInsn(IF_ICMPLT, l48);
        mv.visitLdcInsn("The server is full!");
        Label l49 = new Label();
        mv.visitJumpInsn(GOTO, l49);
        mv.visitLabel(l48);
        mv.visitFrame(Opcodes.F_APPEND,1, new Object[] {"joebkt/PlayerList"}, 0, null);
        mv.visitInsn(ACONST_NULL);
        mv.visitLabel(l49);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] {"java/lang/String"});
        mv.visitInsn(ARETURN);
        Label l50 = new Label();
        mv.visitLabel(l50);
        mv.visitLocalVariable("this", "LTesters/ClassToVisit;", null, l9, l50, 0);
        mv.visitLocalVariable("addr", "Ljava/net/SocketAddress;", null, l9, l50, 1);
        mv.visitLocalVariable("profile", "Lcom/mojang/authlib/GameProfile;", null, l9, l50, 2);
        mv.visitLocalVariable("ip", "Ljava/lang/String;", null, l10, l50, 3);
        mv.visitLocalVariable("fileBannedPlayers", "Ljava/io/File;", null, l11, l50, 4);
        mv.visitLocalVariable("bp", "Ljoebkt/BannedPlayers;", null, l12, l50, 5);
        mv.visitLocalVariable("lastConnectTime", "Ljava/util/concurrent/ConcurrentHashMap;", "Ljava/util/concurrent/ConcurrentHashMap<Ljava/lang/String;Ljava/lang/Long;>;", l13, l50, 6);
        mv.visitLocalVariable("pName", "Ljava/lang/String;", null, l15, l0, 7);
        mv.visitLocalVariable("msNow", "Ljava/lang/Long;", null, l16, l0, 8);
        mv.visitLocalVariable("msLast", "Ljava/lang/Long;", null, l17, l0, 9);
        mv.visitLocalVariable("var5", "Ljoebkt/sw_BanByNameUUID;", null, l24, l2, 7);
        mv.visitLocalVariable("file", "Ljava/io/File;", null, l25, l2, 8);
        mv.visitLocalVariable("reader", "Ljava/io/BufferedReader;", null, l26, l2, 9);
       mv.visitLocalVariable("reason", "Ljava/lang/String;", null, l27, l2, 10);
        mv.visitLocalVariable("rep", "Ljava/lang/String;", null, l28, l2, 11);
        mv.visitLocalVariable("e", "Ljava/io/IOException;", null, l30, l22, 7);
        mv.visitLocalVariable("whitelist", "Z", null, l31, l50, 7);
        mv.visitLocalVariable("whitelisters", "Ljava/lang/String;", null, l3, l32, 8);
        mv.visitLocalVariable("e", "Ljava/io/IOException;", null, l35, l34, 9);
        mv.visitLocalVariable("bi", "Ljoebkt/BannedIPs;", null, l38, l50, 8);
        mv.visitLocalVariable("file", "Ljava/io/File;", null, l6, l39, 9);
        mv.visitLocalVariable("var3", "Ljoebkt/se_BanByIP;", null, l41, l8, 10);
        mv.visitLocalVariable("reader", "Ljava/io/BufferedReader;", null, l42, l8, 11);
        mv.visitLocalVariable("line", "Ljava/lang/String;", null, l43, l8, 12);
        mv.visitLocalVariable("rep", "Ljava/lang/String;", null, l44, l8, 13);
        mv.visitLocalVariable("e", "Ljava/io/IOException;", null, l46, l39, 10);
        mv.visitLocalVariable("ls", "Ljoebkt/PlayerList;", null, l47, l50, 9);
        mv.visitMaxs(8, 14);
        mv.visitEnd();
    }

}

package RainbowBansTransAgent;

import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

public class RBClassVisitor extends ClassVisitor{

    public RBClassVisitor(ClassVisitor c) {
        super(Opcodes.ASM5, c);
    }

    @Override
    public MethodVisitor visitMethod(int access, String name, String desc,
        String signature, String[] exceptions) {
        if(name.equals("checkIfShouldDisconnect")){
            Logger.getLogger(false).logString("Found method to replace!");
            RBMethodVisitor vs = new RBMethodVisitor(cv.visitMethod(access, name, desc, signature, exceptions), cv);
            vs.visitCode();
            return null;
        }else return cv.visitMethod(access, name, desc, signature, exceptions); 
    }

}