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;
    }
```
* "(I)I", "()V", "(Ljava/lang/String;Z)V"
     *
     * @param m method.
     * @return desc.
     */
    public static String getDescWithoutMethodName(Method m) {
        StringBuilder ret = new StringBuilder();
        ret.append('(');
        Class<?>[] parameterTypes = m.getParameterTypes();
        for (int i = 0; i < parameterTypes.length; i++)
            ret.append(getDesc(parameterTypes[i]));
        ret.append(')').append(getDesc(m.getReturnType()));
        return ret.toString();
    }
    /**
     * get class desc.
     * Object.class => "Ljava/lang/Object;"
     * boolean[].class => "[Z"
     *
     * @param c class.
     * @return desc.
     * @throws NotFoundException
     */
    public static String getDesc(final CtClass c) throws NotFoundException {
        StringBuilder ret = new StringBuilder();
        if (c.isArray()) {
            ret.append('[');
            ret.append(getDesc(c.getComponentType()));
        } else if (c.isPrimitive()) {
            String t = c.getName();