问题
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.
回答1:
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
回答2:
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;
回答3:
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;
回答4:
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
回答5:
This way I solved my problem. Hope it helps others. In my case I created a class, a field, their getter & 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<RestResponse> 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<RestResponse> 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;
}
来源：https://stackoverflow.com/questions/19389723/can-not-deserialize-instance-of-java-lang-string-out-of-start-object-token