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;
    }
```
for (int i = 0; i < parameterTypes.length; i++) {
            if (i > 0)
                ret.append(',');
            ret.append(getName(parameterTypes[i]));
        }
        ret.append(')');
        return ret.toString();
    }
    /**
     * get class desc.
     * boolean[].class => "[Z"
     * Object.class => "Ljava/lang/Object;"
     *
     * @param c class.
     * @return desc.
     * @throws NotFoundException
     */
    public static String getDesc(Class<?> c) {
        StringBuilder ret = new StringBuilder();
        while (c.isArray()) {
            ret.append('[');
            c = c.getComponentType();
        }
        if (c.isPrimitive()) {
            String t = c.getName();
            if ("void".equals(t)) ret.append(JVM_VOID);
            else if ("boolean".equals(t)) ret.append(JVM_BOOLEAN);
            else if ("byte".equals(t)) ret.append(JVM_BYTE);
            else if ("char".equals(t)) ret.append(JVM_CHAR);
            else if ("double".equals(t)) ret.append(JVM_DOUBLE);