Jackson deserialization fails to construct AckRemoteApplicationEvent

[mmoayyed]

Describe the bug

Using Spring Cloud Bus v5 M4 with Spring Boot v4 M3. It looks as though the Jackson deserialization setup is unable to work with AckRemoteApplicationEvent. I get the following:

2025-10-17 18:00:02,527 ERROR [org.springframework.cloud.bus.jackson.BusJacksonMessageConverter] - <Cannot construct instance of `org.springframework.cloud.bus.event.AckRemoteApplicationEvent`, problem: null source
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); byte offset: #389]>
tools.jackson.databind.exc.ValueInstantiationException: Cannot construct instance of `org.springframework.cloud.bus.event.AckRemoteApplicationEvent`, problem: null source
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); byte offset: #389]
	at tools.jackson.databind.exc.ValueInstantiationException.from(ValueInstantiationException.java:44)
	at tools.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:2076)
	at tools.jackson.databind.deser.std.StdValueInstantiator.wrapAsDatabindException(StdValueInstantiator.java:581)
	at tools.jackson.databind.deser.std.StdValueInstantiator.rewrapCtorProblem(StdValueInstantiator.java:602)
	at tools.jackson.databind.deser.std.StdValueInstantiator.createFromObjectWith(StdValueInstantiator.java:289)
	at tools.jackson.databind.deser.ValueInstantiator.createFromObjectWith(ValueInstantiator.java:270)
	at tools.jackson.databind.deser.bean.PropertyBasedCreator.build(PropertyBasedCreator.java:252)
	at tools.jackson.databind.deser.bean.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:697)
	at tools.jackson.databind.deser.bean.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1417)
	at tools.jackson.databind.deser.bean.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:480)
	at tools.jackson.databind.deser.bean.BeanDeserializer._deserializeOther(BeanDeserializer.java:235)
	at tools.jackson.databind.deser.bean.BeanDeserializer.deserialize(BeanDeserializer.java:202)
	at tools.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:138)
	at tools.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:103)
	at tools.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:243)
	at tools.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:72)
	at tools.jackson.databind.deser.DeserializationContextExt.readRootValue(DeserializationContextExt.java:265)
	at tools.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2610)
	at tools.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1627)
	at org.springframework.cloud.bus.jackson.BusJacksonMessageConverter.convertFromInternal(BusJacksonAutoConfiguration.java:180)
	at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:179)
	at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:171)
	at org.springframework.cloud.function.context.config.SmartCompositeMessageConverter.fromMessage(SmartCompositeMessageConverter.java:75)
	at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.convertInputMessageIfNecessary(SimpleFunctionRegistry.java:1385)
	at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.convertInputIfNecessary(SimpleFunctionRegistry.java:1145)
	at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.doApply(SimpleFunctionRegistry.java:757)
	at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.apply(SimpleFunctionRegistry.java:597)
	at org.springframework.cloud.stream.function.PartitionAwareFunctionWrapper.apply(PartitionAwareFunctionWrapper.java:92)
	at org.springframework.cloud.stream.function.FunctionConfiguration$FunctionWrapper.apply(FunctionConfiguration.java:830)
	at org.springframework.cloud.stream.function.FunctionConfiguration$FunctionToDestinationBinder$1.handleMessageInternal(FunctionConfiguration.java:668)
	at org.springframework.integration.handler.AbstractMessageHandler.doHandleMessage(AbstractMessageHandler.java:102)
	at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:70)
	at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:133)
	at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:150)
	at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:123)
	at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:72)
	at org.springframework.integration.channel.AbstractMessageChannel.sendInternal(AbstractMessageChannel.java:438)
	at org.springframework.integration.channel.AbstractMessageChannel.sendWithMetrics(AbstractMessageChannel.java:409)
	at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:338)
	at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:310)
	at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:187)
	at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:166)
	at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
	at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
	at org.springframework.integration.endpoint.MessageProducerSupport.sendMessageWithTracking(MessageProducerSupport.java:278)
	at org.springframework.integration.endpoint.MessageProducerSupport.sendMessage(MessageProducerSupport.java:267)
	at org.springframework.integration.amqp.inbound.AmqpInboundChannelAdapter.access$000(AmqpInboundChannelAdapter.java:71)
	at org.springframework.integration.amqp.inbound.AmqpInboundChannelAdapter$Listener.lambda$onMessage$0(AmqpInboundChannelAdapter.java:392)
	at org.springframework.core.retry.RetryTemplate.execute(RetryTemplate.java:178)
	at org.springframework.integration.amqp.inbound.AmqpInboundChannelAdapter$Listener.onMessage(AmqpInboundChannelAdapter.java:385)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:1683)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.actualInvokeListener(AbstractMessageListenerContainer.java:1612)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:1599)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:1590)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListenerAndHandleException(AbstractMessageListenerContainer.java:1539)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.lambda$executeListener$1(AbstractMessageListenerContainer.java:1517)
	at io.micrometer.observation.Observation.observe(Observation.java:499)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:1517)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:1117)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:1062)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.mainLoop(SimpleMessageListenerContainer.java:1466)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1360)
	at java.base/java.lang.VirtualThread.run(VirtualThread.java:456)
Caused by: java.lang.IllegalArgumentException: null source
	at java.base/java.util.EventObject.<init>(EventObject.java:57)
	at org.springframework.context.ApplicationEvent.<init>(ApplicationEvent.java:48)
	at org.springframework.cloud.bus.event.RemoteApplicationEvent.<init>(RemoteApplicationEvent.java:61)
	at org.springframework.cloud.bus.event.AckRemoteApplicationEvent.<init>(AckRemoteApplicationEvent.java:49)
	at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:735)
	at tools.jackson.databind.introspect.AnnotatedConstructor.call(AnnotatedConstructor.java:113)
	at tools.jackson.databind.deser.std.StdValueInstantiator.createFromObjectWith(StdValueInstantiator.java:287)
	... 58 more

[ryanjbaxter]

Can you provide a complete, minimal, verifiable sample that reproduces the problem? It should be available as a GitHub (or similar) project or attached to this issue as a zip file.

[mmoayyed]

Absolutely, will post back.

[mmoayyed]

Still working on a better and simpler reproducer, but I can for the time being share this bit of feedback:

I have the following quick and dirty test case in BusJacksonIntegrationTests:

var payload = """
{"type":"AckRemoteApplicationEvent","originService":"cas:none:8443:76423368c40f9704c6eef3c8ec533fc4","ackDestinationService":"**","ackId":"c20b5beb-766a-4d88-ad2c-2a058990d0ab","destinationService":"**","event":"org.springframework.cloud.bus.event.RefreshRemoteApplicationEvent","id":"7035dd0e-5924-47a7-adf8-ba1487f1cda0","timestamp":1760997298377}	
""";
var message = new GenericMessage<>(payload.getBytes(StandardCharsets.UTF_8));
converter.convertFromInternal(message, RemoteApplicationEvent.class, null);

This does work in the current M4 release line, as is. The difference here is that the Jackson version used here is v3 RC9.

If I however switch to Jackson v3 GA, I can see this fail with basically the exact same stack as I received originally:

java.lang.IllegalArgumentException: null source
	at java.base/java.util.EventObject.<init>(EventObject.java:57)
	at org.springframework.context.ApplicationEvent.<init>(ApplicationEvent.java:48)
	at org.springframework.cloud.bus.event.RemoteApplicationEvent.<init>(RemoteApplicationEvent.java:61)
	at org.springframework.cloud.bus.event.AckRemoteApplicationEvent.<init>(AckRemoteApplicationEvent.java:49)
	at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:735)
	at tools.jackson.databind.introspect.AnnotatedConstructor.call(AnnotatedConstructor.java:113)
	at tools.jackson.databind.deser.std.StdValueInstantiator.createFromObjectWith(StdValueInstantiator.java:287)
	at tools.jackson.databind.deser.ValueInstantiator.createFromObjectWith(ValueInstantiator.java:270)
	at tools.jackson.databind.deser.bean.PropertyBasedCreator.build(PropertyBasedCreator.java:252)
	at tools.jackson.databind.deser.bean.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:697)
	at tools.jackson.databind.deser.bean.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1417)
	at tools.jackson.databind.deser.bean.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:480)
	at tools.jackson.databind.deser.bean.BeanDeserializer._deserializeOther(BeanDeserializer.java:235)
	at tools.jackson.databind.deser.bean.BeanDeserializer.deserialize(BeanDeserializer.java:202)
	at tools.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:138)
	at tools.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:103)
	at tools.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:243)
	at tools.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:72)
	at tools.jackson.databind.deser.DeserializationContextExt.readRootValue(DeserializationContextExt.java:265)
	at tools.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2610)
	at tools.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1627)
	at org.springframework.cloud.bus.jackson.BusJacksonMessageConverter.convertFromInternal(BusJacksonAutoConfiguration.java:180)
	at org.springframework.cloud.bus.jackson.BusJacksonIntegrationTests.testCustomEventSerializes

So perhaps this is not a problem yet, but I suspect it will be very soon. You're most welcome to close this out if you prefer.

[mmoayyed]

In my analysis and running the integration test, I can see that when using Jackson v3 RC9, this constructor is hit:

private AckRemoteApplicationEvent() {
		super();
		this.ackDestinationService = null;
		this.ackId = null;
		this.event = null;
	}

Jackson v3 GA (3.0.0) instead uses this:

public AckRemoteApplicationEvent(Object source, String originService, Destination destination,
			String ackDestinationService, String ackId, Class<? extends RemoteApplicationEvent> type) {
		super(source, originService, destination);
		this.ackDestinationService = ackDestinationService;
		this.ackId = ackId;
		this.event = type;
}

...where the source is eventually rejected as being null.