EventListener Can not parse JSON string to Java Object

[zhuoran]

In my case I used JacksonJsonSupport to parse json object

config.setJsonSupport(new JacksonJsonSupport());
config.getJsonSupport().addEventMapping("", "message", ChatEvent.class);
            ....
server.addEventListener("message", ChatEvent.class,chatEventListener);

when I received user data from ChatEventListener and I always get a error!

This problem occurs only when the Android client, JavaScript client has no problem

Android Client Code Both of these two methods are parse failed

ChatEvent data = new ChatEvent();
mSocket.emit("message", JSON.toJSONString(data));

ChatEvent data = new ChatEvent();
mSocket.emit("message", data);

Any Idea for this？

Thx

···java [com.corundumstudio.socketio.JsonSupportWrapper]-[ERROR] Can't read value: ["message","{\"action\":1,\"content\":\"ffc\",\"date\":1437811543560,\"from\":1,\"nickName\":\"test\",\"roomId\":\"1001\",\"uid\":\"AYGQNVGEQOZ95POR\"}"] for type: class com.corundumstudio.socketio.protocol.Event com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class com.xxx.chat.protocol.ChatEvent] from String value ('{"action":1,"content":"ffc","date":1437811543560,"from":1,"nickName":"test","roomId":"1001","uid":"AYGQNVGEQOZ95POR"}'); no single-String constructor/factory method at [Source: io.netty.buffer.ByteBufInputStream@21a1f581; line: 1, column: 11] at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148) at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:757) at com.fasterxml.jackson.databind.deser.ValueInstantiator._createFromStringFallbacks(ValueInstantiator.java:277) at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:289) at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1133) at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:135) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:126) at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:3023) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1637) at com.corundumstudio.socketio.protocol.JacksonJsonSupport$EventDeserializer.deserialize(JacksonJsonSupport.java:194) at com.corundumstudio.socketio.protocol.JacksonJsonSupport$EventDeserializer.deserialize(JacksonJsonSupport.java:155) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3051) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2192) at com.corundumstudio.socketio.protocol.JacksonJsonSupport.readValue(JacksonJsonSupport.java:337) at com.corundumstudio.socketio.JsonSupportWrapper.readValue(JsonSupportWrapper.java:52) at com.corundumstudio.socketio.protocol.PacketDecoder.parseBody(PacketDecoder.java:303) at com.corundumstudio.socketio.protocol.PacketDecoder.decode(PacketDecoder.java:184) at com.corundumstudio.socketio.protocol.PacketDecoder.decodePackets(PacketDecoder.java:150) at com.corundumstudio.socketio.handler.InPacketHandler.channelRead0(InPacketHandler.java:65) at com.corundumstudio.socketio.handler.InPacketHandler.channelRead0(InPacketHandler.java:36) at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:187) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846) at com.corundumstudio.socketio.transport.WebSocketTransport.channelRead(WebSocketTransport.java:94) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at com.corundumstudio.socketio.transport.PollingTransport.channelRead(PollingTransport.java:109) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at com.corundumstudio.socketio.handler.AuthorizeHandler.channelRead(AuthorizeHandler.java:115) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:182) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) at java.lang.Thread.run(Thread.java:745) 2015-07-25 16:03:05.042 [com.corundumstudio.socketio.handler.InPacketHandler]-[ERROR] Error during data processing. Client sessionId: d2a0be61-0ab0-437f-9c1e-2b325ae316d2, data: java.lang.NullPointerException at com.corundumstudio.socketio.protocol.PacketDecoder.parseBody(PacketDecoder.java:304) at com.corundumstudio.socketio.protocol.PacketDecoder.decode(PacketDecoder.java:184) at com.corundumstudio.socketio.protocol.PacketDecoder.decodePackets(PacketDecoder.java:150) at com.corundumstudio.socketio.handler.InPacketHandler.channelRead0(InPacketHandler.java:65) at com.corundumstudio.socketio.handler.InPacketHandler.channelRead0(InPacketHandler.java:36) at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:187) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846) at com.corundumstudio.socketio.transport.WebSocketTransport.channelRead(WebSocketTransport.java:94) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at com.corundumstudio.socketio.transport.PollingTransport.channelRead(PollingTransport.java:109) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at com.corundumstudio.socketio.handler.AuthorizeHandler.channelRead(AuthorizeHandler.java:115) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:182) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) at java.lang.Thread.run(Thread.java:745)

[nebyan]

Hi @zhuoran did you find any solution for this problem

[atlas1119]

Hi @zhuoran, I have the same problem, do you fixed it??

[jiangbaojun]

Android client use json parser is "org.json",when emit message,you should like this: ChatEvent data = new ChatEvent(); mSocket.emit("message", new JSONObject(data));

[eshiett1995]

@jiangbaojun is right, i also added a correction to his tho

mSocket.emit("message", new JSONObject(new Gson().toJson(data)));

try and convert the object you are trying to send to a string using GSON library

[jingzhongyue]

my Solution: the bean add constructor by createFromString like this：

`class TestBean {

private String x;
private String y;
private String z;

public TestBean() {}

public TestBean(String beanStr) {
    // StdValueInstantiator.createFromString
    // _fromStringCreator
    JSONObject parseObject = JSON.parseObject(beanStr);
    setX(parseObject.getString("x"));
    setY(parseObject.getString("y"));
    setZ(parseObject.getString("z"));
}`

you can grab the packet By wrieshark Look at the differences between JS and Android package

the package Sketch Map:

JS-Client package:

java-client package:

[Dmunch04]

@jingzhongyue Hey. I'm experiencing the same problem as he does. Except that it's the JS client that doesn't work for me. Would you mind explaining that solution, as I'm not quite sure what you mean?