Cannot deserialize instance of `java.util.LinkedHashMap` out of START_ARRAY token

[tech.abd...@gmail.com]

I am facing an issue while getting accessing the body of my http put request in Vert.x. The exception which I am getting is com.fasterxml.jackson.databind.exc.MismatchedInputException. The same code works when I try it with postman. I am not able to figure it out what making it different when I request from my application. 

I am following these steps, 

1) I have registered the handler. 

 router.route("/record").handler(BodyHandler.create());

2) then I try to get the body of my put request 

JsonObject body = routingContext.getBodyAsJson(); 

This works when I call from postman but starts complaining when I try from my application. 

My JSon object is a bit complex but it does not work if even I shorten the Json object. 

My Json in body is

{

    "ani": "23452",

    "cdtd": 1,

    "fields": [

        [

            {

                "id": 1,

                "name": "firstname",

                "type": "text",

                "text": "First Name",

                "values": null,

                "agentid": null,

                "agentname": null,

                "peripheralid": null,

                "maxlength": 20,

                "columnright": false,

                "value": "adsf",

                "updateincallvariable": "adf"

            },

            {

                "id": 2,

                "name": "lastname",

                "type": "text",

                "text": "Last Name",

                "values": null,

                "agentid": null,

                "agentname": null,

                "peripheralid": null,

                "maxlength": 20,

                "columnright": false,

                "value": "asdfas",

                "updateincallvariable": "asdfa"

            }

        ],

        [

            {

                "id": 1,

                "name": "email",

                "type": "text",

                "text": "First Name",

                "values": null,

                "agentid": null,

                "agentname": null,

                "peripheralid": null,

                "maxlength": 20,

                "columnright": false,

                "value": "adsf",

                "updateincallvariable": "adf"

            },

            {

                "id": 2,

                "name": "phone",

                "type": "text",

                "text": "Last Name",

                "values": null,

                "agentid": null,

                "agentname": null,

                "peripheralid": null,

                "maxlength": 20,

                "columnright": false,

                "value": "asdfas",

                "updateincallvariable": "asdfa"

            }

        ]

    ]

}

This does not work even if I shorten my Json

{

"ani": "+4962518622644",

"cdtd": 1,

"fields": "Nothing"

}

here is the full stack trace of exception, 

Dez 03, 2018 4:13:46 PM io.vertx.ext.web.impl.RoutingContextImplBase

SEVERE: Unexpected exception in route

io.vertx.core.json.DecodeException: Failed to decode:Cannot deserialize instance of `java.util.LinkedHashMap` out of START_ARRAY token

 at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 1]

at io.vertx.core.json.Json.decodeValue(Json.java:168)

at io.vertx.core.json.JsonObject.fromBuffer(JsonObject.java:952)

at io.vertx.core.json.JsonObject.<init>(JsonObject.java:72)

at io.vertx.ext.web.impl.RoutingContextImpl.getBodyAsJson(RoutingContextImpl.java:257)

at io.vertx.reactivex.ext.web.RoutingContext.getBodyAsJson(RoutingContext.java:316)

at com.buchersuter.customerdetails.verticles.AgentVerticle.updateRecord(AgentVerticle.java:124)

at io.vertx.reactivex.ext.web.Route$1.handle(Route.java:155)

at io.vertx.reactivex.ext.web.Route$1.handle(Route.java:153)

at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:225)

at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:85)

at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:133)

at io.vertx.reactivex.ext.web.RoutingContext.next(RoutingContext.java:128)

at com.buchersuter.customerdetails.verticles.AgentVerticle.checkSession(AgentVerticle.java:77)

at io.vertx.reactivex.ext.web.Route$1.handle(Route.java:155)

at io.vertx.reactivex.ext.web.Route$1.handle(Route.java:153)

at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:225)

at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:120)

at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:133)

at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.doEnd(BodyHandlerImpl.java:231)

at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.end(BodyHandlerImpl.java:211)

at io.vertx.ext.web.handler.impl.BodyHandlerImpl.lambda$handle$0(BodyHandlerImpl.java:74)

at io.vertx.core.http.impl.HttpServerRequestImpl.handleEnd(HttpServerRequestImpl.java:417)

at io.vertx.core.http.impl.Http1xServerConnection.handleEnd(Http1xServerConnection.java:482)

at io.vertx.core.http.impl.Http1xServerConnection.handleContent(Http1xServerConnection.java:477)

at io.vertx.core.http.impl.Http1xServerConnection.processMessage(Http1xServerConnection.java:458)

at io.vertx.core.http.impl.Http1xServerConnection.handleMessage(Http1xServerConnection.java:144)

at io.vertx.core.http.impl.HttpServerImpl$ServerHandlerWithWebSockets.handleMessage(HttpServerImpl.java:728)

at io.vertx.core.http.impl.HttpServerImpl$ServerHandlerWithWebSockets.handleMessage(HttpServerImpl.java:619)

at io.vertx.core.net.impl.VertxHandler.lambda$channelRead$1(VertxHandler.java:146)

at io.vertx.core.impl.ContextImpl.lambda$wrapTask$2(ContextImpl.java:337)

at io.vertx.core.impl.ContextImpl.executeFromIO(ContextImpl.java:195)

at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:144)

at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)

at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)

at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)

at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)

at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)

at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)

at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)

at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)

at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1359)

at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)

at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)

at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:935)

at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:141)

at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)

at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)

at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)

at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)

at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:886)

at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)

at java.lang.Thread.run(Thread.java:748)

Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.LinkedHashMap` out of START_ARRAY token

 at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 1]

at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)

at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1342)

at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1138)

at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1092)

at com.fasterxml.jackson.databind.deser.std.StdDeserializer._deserializeFromEmpty(StdDeserializer.java:599)

at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:360)

at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:29)

at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)

at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3070)

at io.vertx.core.json.Json.decodeValue(Json.java:166)

... 51 more

Any suggestion to troubleshoot this. 

[Julien Viet]

have you checked that the body is valid json ?

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[tech.abd...@gmail.com]

Can you please help a bit how I would know my Json in body is a valid Json. I tried reducing the complexity in my shorten Json but still this does not work. My Json body after reducing is; 

 {

"ani": "+23234535",

"cdtd": 1,

"fields": "Nothing"

}

[Jez P]

If it works correctly in postman then I think in some way your application is sending something different to postman. Can I suggest logging the body before calling getbodyasjson and comparing the two calls? I do not believe the body is the same in both cases. 

[tech.abd...@gmail.com]

You are right. At application side I was passing body in variable as it is. I was able to fix it after wrapping by request body with stringify. 

JSON.stringify(body);

Thanks for the hint.