dubbo-plugin/dubbo-filter-validation/src/main/java/org/apache/dubbo/validation/support/jvalidation/JValidator.java [138:196]:
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    private static Class<?> generateMethodParameterClass(Class<?> clazz, Method method, String parameterClassName)
            throws Exception {
        ClassPool pool = ClassGenerator.getClassPool(clazz.getClassLoader());
        synchronized (parameterClassName.intern()) {
            CtClass ctClass = null;
            try {
                ctClass = pool.getCtClass(parameterClassName);
            } catch (NotFoundException ignore) {
            }

            if (null == ctClass) {
                ctClass = pool.makeClass(parameterClassName);
                ClassFile classFile = ctClass.getClassFile();
                ctClass.addConstructor(CtNewConstructor.defaultConstructor(pool.getCtClass(parameterClassName)));
                // parameter fields
                Parameter[] parameters = method.getParameters();
                Annotation[][] parameterAnnotations = method.getParameterAnnotations();
                for (int i = 0; i < parameters.length; i++) {
                    Annotation[] annotations = parameterAnnotations[i];
                    AnnotationsAttribute attribute =
                            new AnnotationsAttribute(classFile.getConstPool(), AnnotationsAttribute.visibleTag);
                    for (Annotation annotation : annotations) {
                        if (annotation.annotationType().isAnnotationPresent(Constraint.class)) {
                            javassist.bytecode.annotation.Annotation ja = new javassist.bytecode.annotation.Annotation(
                                    classFile.getConstPool(),
                                    pool.getCtClass(annotation.annotationType().getName()));
                            Method[] members = annotation.annotationType().getMethods();
                            for (Method member : members) {
                                if (Modifier.isPublic(member.getModifiers())
                                        && member.getParameterTypes().length == 0
                                        && member.getDeclaringClass() == annotation.annotationType()) {
                                    Object value = member.invoke(annotation);
                                    if (null != value) {
                                        MemberValue memberValue = createMemberValue(
                                                classFile.getConstPool(),
                                                pool.get(member.getReturnType().getName()),
                                                value);
                                        ja.addMemberValue(member.getName(), memberValue);
                                    }
                                }
                            }
                            attribute.addAnnotation(ja);
                        }
                    }
                    Parameter parameter = parameters[i];
                    Class<?> type = parameter.getType();
                    String fieldName = parameter.getName();
                    CtField ctField = CtField.make(
                            "public " + type.getCanonicalName() + " " + fieldName + ";",
                            pool.getCtClass(parameterClassName));
                    ctField.getFieldInfo().addAttribute(attribute);
                    ctClass.addField(ctField);
                }
                return pool.toClass(ctClass, clazz, clazz.getClassLoader(), clazz.getProtectionDomain());
            } else {
                return Class.forName(parameterClassName, true, clazz.getClassLoader());
            }
        }
    }
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dubbo-plugin/dubbo-filter-validation/src/main/java/org/apache/dubbo/validation/support/jvalidation/JValidatorNew.java [138:196]:
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    private static Class<?> generateMethodParameterClass(Class<?> clazz, Method method, String parameterClassName)
            throws Exception {
        ClassPool pool = ClassGenerator.getClassPool(clazz.getClassLoader());
        synchronized (parameterClassName.intern()) {
            CtClass ctClass = null;
            try {
                ctClass = pool.getCtClass(parameterClassName);
            } catch (NotFoundException ignore) {
            }

            if (null == ctClass) {
                ctClass = pool.makeClass(parameterClassName);
                ClassFile classFile = ctClass.getClassFile();
                ctClass.addConstructor(CtNewConstructor.defaultConstructor(pool.getCtClass(parameterClassName)));
                // parameter fields
                Parameter[] parameters = method.getParameters();
                Annotation[][] parameterAnnotations = method.getParameterAnnotations();
                for (int i = 0; i < parameters.length; i++) {
                    Annotation[] annotations = parameterAnnotations[i];
                    AnnotationsAttribute attribute =
                            new AnnotationsAttribute(classFile.getConstPool(), AnnotationsAttribute.visibleTag);
                    for (Annotation annotation : annotations) {
                        if (annotation.annotationType().isAnnotationPresent(Constraint.class)) {
                            javassist.bytecode.annotation.Annotation ja = new javassist.bytecode.annotation.Annotation(
                                    classFile.getConstPool(),
                                    pool.getCtClass(annotation.annotationType().getName()));
                            Method[] members = annotation.annotationType().getMethods();
                            for (Method member : members) {
                                if (Modifier.isPublic(member.getModifiers())
                                        && member.getParameterTypes().length == 0
                                        && member.getDeclaringClass() == annotation.annotationType()) {
                                    Object value = member.invoke(annotation);
                                    if (null != value) {
                                        MemberValue memberValue = createMemberValue(
                                                classFile.getConstPool(),
                                                pool.get(member.getReturnType().getName()),
                                                value);
                                        ja.addMemberValue(member.getName(), memberValue);
                                    }
                                }
                            }
                            attribute.addAnnotation(ja);
                        }
                    }
                    Parameter parameter = parameters[i];
                    Class<?> type = parameter.getType();
                    String fieldName = parameter.getName();
                    CtField ctField = CtField.make(
                            "public " + type.getCanonicalName() + " " + fieldName + ";",
                            pool.getCtClass(parameterClassName));
                    ctField.getFieldInfo().addAttribute(attribute);
                    ctClass.addField(ctField);
                }
                return pool.toClass(ctClass, clazz, clazz.getClassLoader(), clazz.getProtectionDomain());
            } else {
                return Class.forName(parameterClassName, true, clazz.getClassLoader());
            }
        }
    }
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