[GitHub] [incubator-dubbo] wuxianglin commented on issue #277: dubbo序列化问题【紧急，求回复 】

["wuxianglin (GitHub)" <gi...@apache.org>]

also encounter this problem
i use dubbo2.5.9, serialization is fst(has compared with the latest version of dubbo, the same)
provider throw following exception:
"Decode rpc invocation failed: java.lang.String cannot be cast to java.util.Map"

I have check the source code
`public Object decode(Channel channel, InputStream input) throws IOException {
        ObjectInput in = CodecSupport.getSerialization(channel.getUrl(), serializationType)
                .deserialize(channel.getUrl(), input);

        setAttachment(Constants.DUBBO_VERSION_KEY, in.readUTF());
        setAttachment(Constants.PATH_KEY, in.readUTF());
        setAttachment(Constants.VERSION_KEY, in.readUTF());

        setMethodName(in.readUTF());
        try {
            Object[] args;
            Class<?>[] pts;
            String desc = in.readUTF();
            if (desc.length() == 0) {
                pts = DubboCodec.EMPTY_CLASS_ARRAY;
                args = DubboCodec.EMPTY_OBJECT_ARRAY;
            } else {
                pts = ReflectUtils.desc2classArray(desc);
                args = new Object[pts.length];
                for (int i = 0; i < args.length; i++) {
                    try {
                        args[i] = in.readObject(pts[i]);
                    } catch (Exception e) {
                        if (log.isWarnEnabled()) {
                            log.warn("Decode argument failed: " + e.getMessage(), e);
                        }
                    }
                }
            }
            setParameterTypes(pts);

            Map<String, String> map = (Map<String, String>) in.readObject(Map.class);**-------------this line throw exception**
            if (map != null && map.size() > 0) {
                Map<String, String> attachment = getAttachments();
                if (attachment == null) {
                    attachment = new HashMap<String, String>();
                }
                attachment.putAll(map);
                setAttachments(attachment);
            }
            //decode argument ,may be callback
            for (int i = 0; i < args.length; i++) {
                args[i] = decodeInvocationArgument(channel, this, pts, i, args[i]);
            }

            setArguments(args);

        } catch (ClassNotFoundException e) {
            throw new IOException(StringUtils.toString("Read invocation data failed.", e));
        }
        return this;
    }`


the line which deserializa attachment encounter error



[ Full content available at: https://github.com/apache/incubator-dubbo/issues/277 ]
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