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;
    }
```
StringBuilder sb = new StringBuilder();
            while (c-- > 0)
                sb.append("[");
            if ("void".equals(name)) sb.append(JVM_VOID);
            else if ("boolean".equals(name)) sb.append(JVM_BOOLEAN);
            else if ("byte".equals(name)) sb.append(JVM_BYTE);
            else if ("char".equals(name)) sb.append(JVM_CHAR);
            else if ("double".equals(name)) sb.append(JVM_DOUBLE);
            else if ("float".equals(name)) sb.append(JVM_FLOAT);
            else if ("int".equals(name)) sb.append(JVM_INT);
            else if ("long".equals(name)) sb.append(JVM_LONG);
            else if ("short".equals(name)) sb.append(JVM_SHORT);
            else sb.append('L').append(name).append(';'); 
            name = sb.toString();
        } else {
            if ("void".equals(name)) return void.class;
            else if ("boolean".equals(name)) return boolean.class;
            else if ("byte".equals(name)) return byte.class;
            else if ("char".equals(name)) return char.class;
            else if ("double".equals(name)) return double.class;
            else if ("float".equals(name)) return float.class;
            else if ("int".equals(name)) return int.class;
            else if ("long".equals(name)) return long.class;
            else if ("short".equals(name)) return short.class;
        }
        if (cl == null)
            cl = ClassHelper.getClassLoader();
        Class<?> clazz = NAME_CLASS_CACHE.get(name);
        if (clazz == null) {
            clazz = Class.forName(name, true, cl);