websocket - How do I call a STOMP message with Postman using injection (Using Kotlin)? - Stack Overflow

I have the following...

@MessageMapping("/hello")
@SendTo("/topic/greetings")
@Throws(Exception::class)
fun greeting(message: TestMessage): Greeting {

However, when I run and send a message I get

Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `org.gleason.love_monkey.model.TestMessage` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1, column: 2]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1754) ~[jackson-databind-2.18.2.jar:2.18.2]

I tried changing to

    fun greeting(message: Any): Greeting {
        val jsonString: String
        // Log the incoming message
        if (message is ByteArray) {
            jsonString = byteArrayToString(message)
        } else {
            jsonString = objectMapper.writeValueAsString(message)
        }
        logger.info("Received message: $jsonString")

And when I do that I see that it is byteEncoded but correct...

2025-01-31T18:40:40.006-05:00  INFO 49504 --- [love-monkey] [nboundChannel-1] o.g.l.controller.WebsocketController     : Received message: {"name":"me"}

The frame was made using the process described here

The data class is

data class TestMessage(val name: String)

What am I missing how can I type the message and still use postman

Update

I tried changing to

        val jsonString: String
        // Log the incoming message
        if (message is ByteArray) {
            jsonString = byteArrayToString(message)
        } else {
            jsonString = objectMapper.writeValueAsString(message)
        }
        logger.info("Received message: $jsonString")

        // Log the JSON string before deserialization
        logger.info("JSON string to be deserialized: ${jsonString.trim()}")

        val testMessage: TestMessage = objectMapper.readValue(jsonString.trim(), TestMessage::class.java)

And when I debug into the object mapper it looks correct...

But it still throws

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `org.gleason.love_monkey.model.TestMessage` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1, column: 2]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1754) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1379) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1512) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:348) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:185) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:342) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4917) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3860) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3828) ~[jackson-databind-2.18.2.jar:2.18.2]
    at org.gleason.love_monkey.controller.WebsocketController.greeting(WebsocketController.kt:35) ~[main/:na]
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:169) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:119) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.AbstractMethodMessageHandler.handleMatch(AbstractMethodMessageHandler.java:568) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.simp.annotation.support.SimpAnnotationMethodMessageHandler.handleMatch(SimpAnnotationMethodMessageHandler.java:530) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.simp.annotation.support.SimpAnnotationMethodMessageHandler.handleMatch(SimpAnnotationMethodMessageHandler.java:93) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.AbstractMethodMessageHandler.handleMessageInternal(AbstractMethodMessageHandler.java:522) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.AbstractMethodMessageHandler.handleMessage(AbstractMethodMessageHandler.java:457) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.support.ExecutorSubscribableChannel$SendTask.run(ExecutorSubscribableChannel.java:152) ~[spring-messaging-6.2.2.jar:6.2.2]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]

Per the answer I tried updating to

import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.kotlin.registerKotlinModule
...
private val objectMapper = ObjectMapper().registerKotlinModule()
...
val testMessage: TestMessage = objectMapper.readValue(jsonString.trim(), TestMessage::class.java)

But I still get...

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of org.gleason.love_monkey.model.TestMessage (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator) at [Source: REDACTED (StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION disabled); line: 1, column: 2]

Raw message

SEND
destination:/app/hello
content-length:19
content-type:application/json

{"name":"Me"}

I have the following...

@MessageMapping("/hello")
@SendTo("/topic/greetings")
@Throws(Exception::class)
fun greeting(message: TestMessage): Greeting {

However, when I run and send a message I get

Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `org.gleason.love_monkey.model.TestMessage` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1, column: 2]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1754) ~[jackson-databind-2.18.2.jar:2.18.2]

I tried changing to

    fun greeting(message: Any): Greeting {
        val jsonString: String
        // Log the incoming message
        if (message is ByteArray) {
            jsonString = byteArrayToString(message)
        } else {
            jsonString = objectMapper.writeValueAsString(message)
        }
        logger.info("Received message: $jsonString")

And when I do that I see that it is byteEncoded but correct...

2025-01-31T18:40:40.006-05:00  INFO 49504 --- [love-monkey] [nboundChannel-1] o.g.l.controller.WebsocketController     : Received message: {"name":"me"}

The frame was made using the process described here

The data class is

data class TestMessage(val name: String)

What am I missing how can I type the message and still use postman

Update

I tried changing to

        val jsonString: String
        // Log the incoming message
        if (message is ByteArray) {
            jsonString = byteArrayToString(message)
        } else {
            jsonString = objectMapper.writeValueAsString(message)
        }
        logger.info("Received message: $jsonString")

        // Log the JSON string before deserialization
        logger.info("JSON string to be deserialized: ${jsonString.trim()}")

        val testMessage: TestMessage = objectMapper.readValue(jsonString.trim(), TestMessage::class.java)

And when I debug into the object mapper it looks correct...

But it still throws

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `org.gleason.love_monkey.model.TestMessage` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1, column: 2]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1754) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1379) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1512) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:348) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:185) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:342) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4917) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3860) ~[jackson-databind-2.18.2.jar:2.18.2]
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3828) ~[jackson-databind-2.18.2.jar:2.18.2]
    at org.gleason.love_monkey.controller.WebsocketController.greeting(WebsocketController.kt:35) ~[main/:na]
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:169) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:119) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.AbstractMethodMessageHandler.handleMatch(AbstractMethodMessageHandler.java:568) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.simp.annotation.support.SimpAnnotationMethodMessageHandler.handleMatch(SimpAnnotationMethodMessageHandler.java:530) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.simp.annotation.support.SimpAnnotationMethodMessageHandler.handleMatch(SimpAnnotationMethodMessageHandler.java:93) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.AbstractMethodMessageHandler.handleMessageInternal(AbstractMethodMessageHandler.java:522) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.handler.invocation.AbstractMethodMessageHandler.handleMessage(AbstractMethodMessageHandler.java:457) ~[spring-messaging-6.2.2.jar:6.2.2]
    at org.springframework.messaging.support.ExecutorSubscribableChannel$SendTask.run(ExecutorSubscribableChannel.java:152) ~[spring-messaging-6.2.2.jar:6.2.2]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]

Per the answer I tried updating to

import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.kotlin.registerKotlinModule
...
private val objectMapper = ObjectMapper().registerKotlinModule()
...
val testMessage: TestMessage = objectMapper.readValue(jsonString.trim(), TestMessage::class.java)

But I still get...

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of org.gleason.love_monkey.model.TestMessage (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator) at [Source: REDACTED (StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION disabled); line: 1, column: 2]

Raw message

SEND
destination:/app/hello
content-length:19
content-type:application/json

{"name":"Me"}

• kotlin
• websocket
• binary
• postman
• spring-websocket

Share Improve this question Follow edited Feb 2 at 23:16 Jackie asked Jan 31 at 23:43 JackieJackie 23.7k4141 gold badges173173 silver badges331331 bronze badges 11

• What is you object mapper? Do you have ObjectMapper().registerKotlinModule()? if it is an issue, I could formulate it as an answer – Geba Commented Feb 1 at 12:49
• I tried to use ObjectMapper() without .registerKotlinModule(). So I guess, it is a case. So I will add an answer – Geba Commented Feb 1 at 13:17
• Also FTR this is on windows as well so the encoding may be wonky. Like Spring may be expecting linux or something but it seems to parse fine in the binary so :shrug: – Jackie Commented Feb 1 at 15:26
• Could you attach the message you send using postman for reproducing simplicity? – Geba Commented Feb 1 at 16:25
• I tried to use postman as show in the link that you have provided and the message was deserialized correctly – Geba Commented Feb 1 at 16:36

 |  Show 6 more comments

1 Answer 1

Sorted by: Reset to default 1

If you use injected objectMapper, check that its definition contains registration of the Kotlin module.

So it should be like this

@Bean
fun objectMapper() = ObjectMapper().registerKotlinModule()

In order to have .registerKotlinModule(), you need to have this dependency

implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.18.2")

It should function the same regardless of whether the input is a String or a ByteArray.