用jarslink做module隔离时,dubbo调用会抛ClassNotFoundException.经查是ClassLoader不一致.

```
    public static Class<?> getReturnType(Invocation invocation) {
        try {
            if (invocation != null && invocation.getInvoker() != null
                    && invocation.getInvoker().getUrl() != null
                    && !invocation.getMethodName().startsWith("$")) {
                String service = invocation.getInvoker().getUrl().getServiceInterface();
                if (service != null && service.length() > 0) {
                    Class<?> cls = ReflectUtils.forName(service);
                    Method method = cls.getMethod(invocation.getMethodName(), invocation.getParameterTypes());
                    if (method.getReturnType() == void.class) {
                        return null;
                    }
                    return method.getReturnType();
                }
            }
        } catch (Throwable t) {
            logger.warn(t.getMessage(), t);
        }
        return null;
    }
```
NAME_CLASS_CACHE.put(name, clazz);
        }
        return clazz;
    }
    /**
     * desc to class.
     * "[Z" => boolean[].class
     * "[[Ljava/util/Map;" => java.util.Map[][].class
     *
     * @param desc desc.
     * @return Class instance.
     * @throws ClassNotFoundException
     */
    public static Class<?> desc2class(String desc) throws ClassNotFoundException {
        return desc2class(ClassHelper.getClassLoader(), desc);
    }
    /**
     * desc to class.
     * "[Z" => boolean[].class
     * "[[Ljava/util/Map;" => java.util.Map[][].class
     *
     * @param cl   ClassLoader instance.
     * @param desc desc.
     * @return Class instance.
     * @throws ClassNotFoundException
     */
    private static Class<?> desc2class(ClassLoader cl, String desc) throws ClassNotFoundException {
        switch (desc.charAt(0)) {
            case JVM_VOID:
                return void.class;