Can not deserialize instance of java lang String out of START OBJECT token

Question

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 lt   extends Workstation gt  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 lt   extends Workstation gt  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 lt String  Object gt  queue   new HashMap lt String  Object gt          private LinkedBlockingDeque lt JobSetEntity gt  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 lt String  Object gt  getQueue             return queue             public LinkedBlockingDeque lt JobSetEntity gt  getCurrentWork             return currentWork             public void setCurrentWork LinkedBlockingDeque lt JobSetEntity gt  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 - gt  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

User · Answer

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

User · Answer

This way I solved my problem  Hope it helps others  In my case I created a class  a field  their getter  amp  setter and then provide the object instead of string   Use this  public static class EncryptedData       private String encryptedData       public String getEncryptedData             return encryptedData             public void setEncryptedData String encryptedData            this encryptedData   encryptedData            PutMapping value   MY IP ADDRESS  public ResponseEntity lt RestResponse gt  updateMyIpAddress  RequestBody final EncryptedData encryptedData        try           Path path   Paths get PUBLIC KEY           byte   bytes   Files readAllBytes path           PKCS8EncodedKeySpec ks   new PKCS8EncodedKeySpec base64 decode bytes            PrivateKey privateKey   KeyFactory getInstance CRYPTO ALGO RSA  generatePrivate ks            Cipher cipher   Cipher getInstance CRYPTO ALGO RSA           cipher init Cipher PRIVATE KEY  privateKey           String decryptedData   new String cipher doFinal encryptedData getEncryptedData   getBytes              String   dataArray   decryptedData split                 Method updateIp   Class forName  com cuanet client helper   getMethod  methodName   String class String class           updateIp invoke null  dataArray 0   dataArray 1           catch  Exception e            LOG error  Unable to update ip address for encrypted data    encryptedData  e              return null    Instead of this    PutMapping value   MY IP ADDRESS  public ResponseEntity lt RestResponse gt  updateMyIpAddress  RequestBody final EncryptedData encryptedData        try           Path path   Paths get PUBLIC KEY           byte   bytes   Files readAllBytes path           PKCS8EncodedKeySpec ks   new PKCS8EncodedKeySpec base64 decode bytes            PrivateKey privateKey   KeyFactory getInstance CRYPTO ALGO RSA  generatePrivate ks            Cipher cipher   Cipher getInstance CRYPTO ALGO RSA           cipher init Cipher PRIVATE KEY  privateKey           String decryptedData   new String cipher doFinal encryptedData getBytes              String   dataArray   decryptedData split                 Method updateIp   Class forName  com cuanet client helper   getMethod  methodName   String class String class           updateIp invoke null  dataArray 0   dataArray 1           catch  Exception e            LOG error  Unable to update ip address for encrypted data    encryptedData  e              return null

User · Answer

Resolved the problem using Jackson library. Prints are called out of Main class and all POJO classes are created. Here is the code snippets.

MainClass.java

public class MainClass {
  public static void main(String[] args) throws JsonParseException, 
       JsonMappingException, IOException {

String jsonStr = "{\r\n" + "    \"id\": 2,\r\n" + " \"socket\": \"0c317829-69bf- 
             43d6-b598-7c0c550635bb\",\r\n"
            + " \"type\": \"getDashboard\",\r\n" + "    \"data\": {\r\n"
            + "     \"workstationUuid\": \"ddec1caa-a97f-4922-833f- 
            632da07ffc11\"\r\n" + " },\r\n"
            + " \"reply\": true\r\n" + "}";

    ObjectMapper mapper = new ObjectMapper();

    MyPojo details = mapper.readValue(jsonStr, MyPojo.class);

    System.out.println("Value for getFirstName is: " + details.getId());
    System.out.println("Value for getLastName  is: " + details.getSocket());
    System.out.println("Value for getChildren is: " + 
      details.getData().getWorkstationUuid());
    System.out.println("Value for getChildren is: " + details.getReply());

}

MyPojo.java

public class MyPojo {
    private String id;

    private Data data;

    private String reply;

    private String socket;

    private String type;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public Data getData() {
        return data;
    }

    public void setData(Data data) {
        this.data = data;
    }

    public String getReply() {
        return reply;
    }

    public void setReply(String reply) {
        this.reply = reply;
    }

    public String getSocket() {
        return socket;
    }

    public void setSocket(String socket) {
        this.socket = socket;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    } 
}

Data.java

public class Data {
    private String workstationUuid;

    public String getWorkstationUuid() {
        return workstationUuid;
    }

    public void setWorkstationUuid(String workstationUuid) {
        this.workstationUuid = workstationUuid;
    }   
}

RESULTS:

Value for getFirstName is: 2
Value for getLastName  is: 0c317829-69bf-43d6-b598-7c0c550635bb
Value for getChildren is: ddec1caa-a97f-4922-833f-632da07ffc11
Value for getChildren is: true

User · Answer

Data content is so variable  I think the best form is to define it as  ObjectNode  and next create his own class to parse   Finally    private ObjectNode data

User · Answer

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

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

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