这个问题是这个PR引入 https://github.com/apache/incubator-dubbo/commit/27917f2e86bbd97ee047d69817730a57bdf5ad6b 2.5.3 ```java private static Method findMethod(Exporter<?> exporter, String method, List<Object> args) { Invoker<?> invoker = exporter.getInvoker(); Method[] methods = invoker.getInterface().getMethods(); Method invokeMethod = null; for (Method m : methods) { if (m.getName().equals(method) && m.getParameterTypes().length == args.size()) { if (invokeMethod != null) { // 重载 if (isMatch(invokeMethod.getParameterTypes(), args)) { invokeMethod = m; break; } } else { invokeMethod = m; } invoker = exporter.getInvoker(); } } return invokeMethod; } ``` 之后版本： ```java private static Method findMethod(Exporter<?> exporter, String method, List<Object> args) { Invoker<?> invoker = exporter.getInvoker(); Method[] methods = invoker.getInterface().getMethods(); for (Method m : methods) { if (m.getName().equals(method) && isMatch(m.getParameterTypes(), args)) { return m; } } return null; } ``` 新版本导致都会执行`isMatch`,这个方法里面有个逻辑，(ps：telnet传入json格式经过fastjson反序列化后是JsonObject,都会执行下面代码) ```java else if (arg instanceof Map) { String name = (String) ((Map<?, ?>) arg).get("class"); Class<?> cls = arg.getClass(); if (name != null && name.length() > 0) { cls = ReflectUtils.forName(name); } if (!type.isAssignableFrom(cls)) { return false; } } ``` 当用户没有传`class`时,clz就是JsonObject.class 导致直接返回false,最终在不传class时，会匹配不到方法，telnet直接会返回找不到方法；之前老代码在调用重载方法时，用户需要传入class进行参数类型判断，无重载方法时无需传入class；PR这样改正之后，导致所有telnet都必须传入class
[ Full content available at: https://github.com/apache/incubator-dubbo/issues/3105 ] This message was relayed via gitbox.apache.org for [email protected]
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