Can not deserialize instance of java.lang.String out of START_OBJECT token

82

I'm running into an issue where my deployable jar hits an exception that doesn't happen when I run this locally in IntelliJ.

Exception:

Receiving an event {id=2, socket=0c317829-69bf-43d6-b598-7c0c550635bb, type=getDashboard, data={workstationUuid=ddec1caa-a97f-4922-833f-632da07ffc11}, reply=true}
Firing getDashboard event to Socket#0c317829-69bf-43d6-b598-7c0c550635bb
Failed invoking AtmosphereFramework.doCometSupport()
java.lang.IllegalArgumentException: Can not deserialize instance of java.lang.String out of START_OBJECT token
 at [Source: N/A; line: -1, column: -1]
        at org.codehaus.jackson.map.ObjectMapper._convert(ObjectMapper.java:2502)
        at org.codehaus.jackson.map.ObjectMapper.convertValue(ObjectMapper.java:2468)
        at com.github.flowersinthesand.portal.support.DefaultDispatcher$DefaultHandler$DataParam.resolve(DefaultDispatcher.java:270)
        at com.github.flowersinthesand.portal.support.DefaultDispatcher$DefaultHandler.handle(DefaultDispatcher.java:204)
        at com.github.flowersinthesand.portal.support.DefaultDispatcher.fire(DefaultDispatcher.java:107)
        at com.github.flowersinthesand.portal.support.AbstractSocketFactory.fire(AbstractSocketFactory.java:73)
        at com.github.flowersinthesand.portal.atmosphere.AtmosphereSocketFactory.onRequest(AtmosphereSocketFactory.java:75)
        at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:256)
        at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:166)
        at org.atmosphere.container.Grizzly2WebSocketSupport.service(Grizzly2WebSocketSupport.java:75)
        at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:1342)
        at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:219)
        at org.atmosphere.websocket.DefaultWebSocketProcessor$2.run(DefaultWebSocketProcessor.java:183)
        at org.atmosphere.util.VoidExecutorService.execute(VoidExecutorService.java:101)
        at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:178)
        at org.atmosphere.websocket.DefaultWebSocketProcessor.invokeWebSocketProtocol(DefaultWebSocketProcessor.java:167)
        at org.atmosphere.container.Grizzly2WebSocketSupport$Grizzly2WebSocketApplication.onMessage(Grizzly2WebSocketSupport.java:171)
        at org.glassfish.grizzly.websockets.DefaultWebSocket.onMessage(DefaultWebSocket.java:164)
        at org.glassfish.grizzly.websockets.frametypes.TextFrameType.respond(TextFrameType.java:70)
        at org.glassfish.grizzly.websockets.DataFrame.respond(DataFrame.java:104)
        at org.glassfish.grizzly.websockets.WebSocketFilter.handleRead(WebSocketFilter.java:221)
        at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:265)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:134)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
        at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:78)
        at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:770)
        at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:551)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:531)
        at java.lang.Thread.run(Thread.java:781)
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token
 at [Source: N/A; line: -1, column: -1]
        at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
        at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:219)
        at org.codehaus.jackson.map.deser.std.StringDeserializer.deserialize(StringDeserializer.java:44)
        at org.codehaus.jackson.map.deser.std.StringDeserializer.deserialize(StringDeserializer.java:13)
        at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2704)
        at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1315)
        at org.codehaus.jackson.map.ObjectMapper._convert(ObjectMapper.java:2498)
        ... 34 more
java.lang.IllegalArgumentException: Can not deserialize instance of java.lang.String out of START_OBJECT token
 at [Source: N/A; line: -1, column: -1] Status 500 Message Server Error

Socket Handler

I believe the exception is occurring when the JSON is parsed into a WorkstationRequest object because of the below item. This is the socket handler:

@On
@Reply
@JsonView({Views.WorkstationView.class})
public WorkstationDashboard getDashboard(@Data WorkstationRequest request) {
    return new WorkstationDashboard(request.getWorkstation());
}

The object the socket handler maps to:

public class WorkstationRequest {

    /* Class to instantiate if this workstation does not already exist */
    private Class<? extends Workstation> workstationClass;

    private WorkflowProcess workflowProcess;

    private PhysicalWorkstation workstation;

    WorkstationService workstationService;

    /**
     * @param workstationClass Required so when jackson maps the UUID we can auto fetch the class
     */
    public WorkstationRequest(Class<? extends Workstation> workstationClass) {
        this.workstationClass = workstationClass;
        workstationService = (WorkstationService) ApplicationContextProvider.getApplicationContext().getBean("workstationService");
    }

    /* Set the workstation based on UUID.  Will register the workstation if it's new */
    @JsonProperty("workstationUuid")
    public void setWorkstation(String workstationUUID) {
        workstation = (PhysicalWorkstation)WorkstationService.getWorkstation(workstationUUID);

        //setup new workstation
        if (workstation == null) {
            WorkstationEntity workstationEntity = workstationService.findByUUID(workstationUUID);
            workstation = (PhysicalWorkstation)Workstation.factory(workstationEntity, workstationClass);

            //register with queue
            WorkflowProcessService.getWorkflowProcess(workstation).registerWorkstation(workstation);
        }
    }

    public PhysicalWorkstation getWorkstation() {
        return workstation;
    }
}

The JSON being mapped:

{"id":2,"socket":"0c317829-69bf-43d6-b598-7c0c550635bb","type":"getDashboard","data":{"workstationUuid":"ddec1caa-a97f-4922-833f-632da07ffc11"},"reply":true}

WorkstationDashboard.java

public class WorkstationDashboard {
    private HashMap<String, Object> queue = new HashMap<String, Object>();

    private LinkedBlockingDeque<JobSetEntity> currentWork;

    public WorkstationDashboard() {
        queue.put("size", 0);
    }

    public WorkstationDashboard(Workstation workstation) {
        fromWorkstation(workstation);
    }

    /* Populate dashboard data from a workstation */
    public void fromWorkstation(Workstation workstation) {
        WorkflowProcess workflowProcess = WorkflowProcessService.getWorkflowProcess(workstation);

        setCurrentWork(workstation.getCurrentWork());
        setQueueSize(workflowProcess.getQueue().size());
    }

    public void setQueueSize(Integer queueSize) {
        queue.put("size", queueSize);
    }

    public HashMap<String, Object> getQueue() {
        return queue;
    }

    public LinkedBlockingDeque<JobSetEntity> getCurrentWork() {
        return currentWork;
    }

    public void setCurrentWork(LinkedBlockingDeque<JobSetEntity> currentWork) {
        this.currentWork = currentWork;
    }
}

I'm at quite a loss as to how to begin debugging this. The stack trace never touches my application. I'm using Maven -> Package to deploy my .jar and executing it with java -jar /path-to-jar.jar

Update: To prevent this question from being incredibly long, I've included my pom.xml here: http://pastebin.com/1ZUtKCfE. I believe this is a dependency issue since the error only occurs on my deployable jar and not on my local PC.

This question is tagged with java deployment atmosphere grizzly

~ Asked on 2013-10-15 19:45:52

The Best Answer is


77

You're mapping this JSON

{
    "id": 2,
    "socket": "0c317829-69bf-43d6-b598-7c0c550635bb",
    "type": "getDashboard",
    "data": {
        "workstationUuid": "ddec1caa-a97f-4922-833f-632da07ffc11"
    },
    "reply": true
}

that contains an element named data that has a JSON object as its value. You are trying to deserialize the element named workstationUuid from that JSON object into this setter.

@JsonProperty("workstationUuid")
public void setWorkstation(String workstationUUID) {

This won't work directly because Jackson sees a JSON_OBJECT, not a String.

Try creating a class Data

public class Data { // the name doesn't matter 
    @JsonProperty("workstationUuid")
    private String workstationUuid;
    // getter and setter
}

the switch up your method

@JsonProperty("data")
public void setWorkstation(Data data) {
    // use getter to retrieve it

~ Answered on 2013-10-15 19:58:38


30

If you do not want to define a separate class for nested json , Defining nested json object as JsonNode should work ,for example :

{"id":2,"socket":"0c317829-69bf-43d6-b598-7c0c550635bb","type":"getDashboard","data":{"workstationUuid":"ddec1caa-a97f-4922-833f-632da07ffc11"},"reply":true}

@JsonProperty("data")
    private JsonNode data;

~ Answered on 2017-03-21 00:35:35


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