gistfile1.txt

public class NoFallDamage {
    private static final Logger logger = Logger.getLogger(NoFallDamage.class.getName());

    private static final double fallDamageModifier = 1.0;

    public static void preinit() {
        try {
            ClassPool classPool = HookManager.getInstance().getClassPool();
            CtClass ctMovementScheme = classPool.get("com.wurmonline.server.creatures.MovementScheme");
            CtMethod ctHitGround = ctMovementScheme.getDeclaredMethod("hitGround", new CtClass[]{CtClass.floatType});

            ctHitGround.instrument(new ExprEditor() {
                @Override
                public void edit(MethodCall m) throws CannotCompileException {
                    if (m.getClassName().equals("com.wurmonline.server.creatures.Creature") && m.getMethodName().equals("addWoundOfType")) {
                        m.replace(
                            "$7 *= " + fallDamageModifier + ";\n" +
                            "if ($7 <= 0)\n" +
                            "{\n" +
                            "    $_ = false;\n" +
                            "}\n" +
                            "else\n" +
                            "{\n" +
                            "    $_ = $proceed($$);\n" +
                            "}"
                        );
                        logger.info("Modified fall damage.");
                    }
                }
            });

        } catch (NotFoundException | CannotCompileException e) {
            logger.severe("Failed to apply NoFallDamage patch: " + e);
        }
    }
}