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;
    }
```
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);
            else if ("float".equals(t)) ret.append(JVM_FLOAT);
            else if ("int".equals(t)) ret.append(JVM_INT);
            else if ("long".equals(t)) ret.append(JVM_LONG);
            else if ("short".equals(t)) ret.append(JVM_SHORT);
        } else {
            ret.append('L');
            ret.append(c.getName().replace('.', '/'));
            ret.append(';');
        }
        return ret.toString();
    }
    /**
     * get method desc.
     * "do(I)I", "do()V", "do(Ljava/lang/String;Z)V"
     *
     * @param m method.
     * @return desc.
     */
    public static String getDesc(final CtMethod m) throws NotFoundException {
        StringBuilder ret = new StringBuilder(m.getName()).append('(');
        CtClass[] 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();