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Published 20 hours ago • verified publisher icon FasterXML

NPE for Map serializing

Open cmdjulian opened this issue 6 months ago • 2 comments

Search before asking

  • [x] I searched in the issues and found nothing similar.
  • [x] I have confirmed that the same problem is not reproduced if I exclude the KotlinModule.
  • [ ] I searched in the issues of databind and other modules used and found nothing similar.
  • [ ] I have confirmed that the problem does not reproduce in Java and only occurs when using Kotlin and KotlinModule.

Describe the bug

Hey,

I found the following closed issue: https://github.com/FasterXML/jackson-databind/issues/4878 I encounter the same issue, but only after upgrading from Jackson 2.18.4 to 2.19.0, downgrading to 2.18.4 fixes it.

This is my stack trace:

Exception in thread "main" java.lang.IllegalArgumentException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["namespace"])
	at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4663)
	at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4594)
	at io.fabric8.kubernetes.client.utils.KubernetesSerialization.asYaml(KubernetesSerialization.java:237)
	at com.etalytics.etadeploy.render.KustomizeManifestRenderer.render(KustomizeManifestRenderer.kt:24)
	at com.etalytics.etadeploy.render.renderers.sealedsecrets.SealedSecretsManifestRenderer.render(SealedSecretsManifestRenderer.kt:77)
	at com.etalytics.etadeploy.render.KubernetesManifestRenderer$renderManifests$2$1.invokeSuspend(KubernetesManifestRenderer.kt:152)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:820)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)
	Suppressed: java.lang.IllegalArgumentException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["namespace"])
		at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4663)
		at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4594)
		at io.fabric8.kubernetes.client.utils.KubernetesSerialization.asYaml(KubernetesSerialization.java:237)
		at com.etalytics.etadeploy.render.KustomizeManifestRenderer.render(KustomizeManifestRenderer.kt:24)
		at com.etalytics.etadeploy.render.renderers.traefik.TraefikManifestRenderer.render(TraefikManifestRenderer.kt:83)
		... 9 more
	Caused by: com.fasterxml.jackson.databind.JsonMappingException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["namespace"])
		at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:400)
		at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:359)
		at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:324)
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:810)
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:763)
		at com.fasterxml.jackson.databind.ser.AnyGetterWriter.getAndSerialize(AnyGetterWriter.java:81)
		at com.fasterxml.jackson.databind.ser.AnyGetterWriter.serializeAsField(AnyGetterWriter.java:89)
		at io.fabric8.kubernetes.model.jackson.BeanPropertyWriterDelegate.serializeAsField(BeanPropertyWriterDelegate.java:68)
		at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:760)
		at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:183)
		at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:503)
		at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:342)
		at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4641)
		... 13 more
	Caused by: java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:796)
		... 22 more
	Suppressed: java.lang.IllegalArgumentException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["helmCharts"])
		at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4663)
		at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4594)
		at io.fabric8.kubernetes.client.utils.KubernetesSerialization.asYaml(KubernetesSerialization.java:237)
		at com.etalytics.etadeploy.render.KustomizeManifestRenderer.render(KustomizeManifestRenderer.kt:24)
		at com.etalytics.etadeploy.render.renderers.monitoring.LocalMonitoringManifestRenderer.render(LocalMonitoringManifestRenderer.kt:236)
		at com.etalytics.etadeploy.render.renderers.monitoring.MonitoringManifestRenderer.render(MonitoringManifestRenderer.kt:49)
		... 9 more
	Caused by: com.fasterxml.jackson.databind.JsonMappingException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["helmCharts"])
		at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:400)
		at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:359)
		at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:324)
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:810)
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:763)
		at com.fasterxml.jackson.databind.ser.AnyGetterWriter.getAndSerialize(AnyGetterWriter.java:81)
		at com.fasterxml.jackson.databind.ser.AnyGetterWriter.serializeAsField(AnyGetterWriter.java:89)
		at io.fabric8.kubernetes.model.jackson.BeanPropertyWriterDelegate.serializeAsField(BeanPropertyWriterDelegate.java:68)
		at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:760)
		at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:183)
		at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:503)
		at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:342)
		at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4641)
		... 14 more
	Caused by: java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:796)
		... 23 more
	Suppressed: java.lang.IllegalArgumentException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["namespace"])
		at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4663)
		at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4594)
		at io.fabric8.kubernetes.client.utils.KubernetesSerialization.asYaml(KubernetesSerialization.java:237)
		at com.etalytics.etadeploy.render.KustomizeManifestRenderer.render(KustomizeManifestRenderer.kt:24)
		at com.etalytics.etadeploy.render.renderers.argocd.ArgoCdManifestRenderer.render(ArgoCdManifestRenderer.kt:245)
		... 9 more
	Caused by: com.fasterxml.jackson.databind.JsonMappingException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["namespace"])
		at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:400)
		at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:359)
		at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:324)
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:810)
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:763)
		at com.fasterxml.jackson.databind.ser.AnyGetterWriter.getAndSerialize(AnyGetterWriter.java:81)
		at com.fasterxml.jackson.databind.ser.AnyGetterWriter.serializeAsField(AnyGetterWriter.java:89)
		at io.fabric8.kubernetes.model.jackson.BeanPropertyWriterDelegate.serializeAsField(BeanPropertyWriterDelegate.java:68)
		at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:760)
		at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:183)
		at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:503)
		at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:342)
		at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4641)
		... 13 more
	Caused by: java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null
		at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:796)
		... 22 more
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null (through reference chain: com.etalytics.etadeploy.render.Kustomize["getAdditionalProperties"]->kotlin.collections.builders.MapBuilder["namespace"])
	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:400)
	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:359)
	at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:324)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:810)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:763)
	at com.fasterxml.jackson.databind.ser.AnyGetterWriter.getAndSerialize(AnyGetterWriter.java:81)
	at com.fasterxml.jackson.databind.ser.AnyGetterWriter.serializeAsField(AnyGetterWriter.java:89)
	at io.fabric8.kubernetes.model.jackson.BeanPropertyWriterDelegate.serializeAsField(BeanPropertyWriterDelegate.java:68)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:760)
	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:183)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:503)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:342)
	at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4641)
	... 13 more
Caused by: java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonSerializer.serialize(Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)" because "keySerializer" is null
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:796)
	... 22 more

Any idea? I could also try to come up with a reproducer if it helps, as there already exists a very similar issue, I though it might not be needed though.

To Reproduce

// Your code here

Expected behavior

No NPE :D

Versions

Kotlin: Jackson-module-kotlin: 2.19.0 Jackson-databind: 2.19.0

Additional context

No response

cmdjulian avatar May 15 '25 13:05 cmdjulian

Please submit code that is minimally reproducible, as it cannot be investigated by only stack trace. At least on CI, no problems have been detected.

k163377 avatar May 16 '25 04:05 k163377

Also note that stack trace here differs from one in https://github.com/FasterXML/jackson-databind/issues/4878 so this is probably not via same code path.

Also: this may be the case already but make sure you use same minor version of jackson-module-kotlin and jackson-databind (both 2.19(.0)).

cowtowncoder avatar May 16 '25 21:05 cowtowncoder