Try searching on Stackoverflow, keyword might be "type id resolver"
On Wednesday, May 22, 2024 at 3:13:21 PM UTC+9 Chuanwise Rafter wrote:
> So how to deserialize them gracefully with the help of Jackson?
>
> On Wednesday, May 22, 2024 at 12:39:42 PM UTC+8 Tatu Saloranta wrote:
>
>> On Tue, May 21, 2024 at 9:23 PM Chuanwise Rafter <rafte...@gmail.com>
>> wrote:
>> >
>> > I need to deserialize incoming packet encoded in JSON. For example,
>> there are two kind of packet: Son and Daughter. The rules are:
>> >
>> > If field "type" is not "sub", error occurred.
>> > If field "type" is "sub", checking field "sub_type":
>> >
>> > if it's "son", deserialize it as `Son`.
>> > if it's "daughter", deserialize it as `Daughter`.
>>
>> This is not a supported use case: Type Id can only come from a single
>> property currently.
>> It won't work even if you tried using different @JsonTypeInfo in
>> subtypes -- it won't work as you might expect.
>>
>> -+ Tatu +-
>>
>> >
>> > According to JacksonDocs - JacksonPolymorphicDeserialization, I add
>> annotations @JsonTypeInfo and @JsonSubTypes:
>> >
>> > ```kotlin
>> > import com.fasterxml.jackson.annotation.JsonSubTypes
>> > import com.fasterxml.jackson.annotation.JsonTypeInfo
>> > import
>> com.fasterxml.jackson.databind.PropertyNamingStrategies.SnakeCaseStrategy
>> > import com.fasterxml.jackson.databind.annotation.JsonNaming
>> > import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
>> > import com.fasterxml.jackson.module.kotlin.readValue
>> > import org.junit.jupiter.api.Test
>> >
>> > @JsonTypeInfo(
>> > use = JsonTypeInfo.Id.NAME,
>> > property = "type",
>> > include = JsonTypeInfo.As.PROPERTY,
>> > visible = true
>> > )
>> > @JsonSubTypes(
>> > JsonSubTypes.Type(Sub::class, name = "sub"),
>> > )
>> > @JsonNaming(SnakeCaseStrategy::class)
>> > interface Base {
>> > }
>> >
>> > @JsonTypeInfo(
>> > use = JsonTypeInfo.Id.NAME,
>> > property = "sub_type",
>> > include = JsonTypeInfo.As.PROPERTY,
>> > visible = true
>> > )
>> > @JsonSubTypes(
>> > JsonSubTypes.Type(Son::class, name = "son"),
>> > JsonSubTypes.Type(Daughter::class, name = "daughter")
>> > )
>> > interface Sub : Base {
>> > }
>> >
>> > data class Son(
>> > val sonField: String
>> > ) : Sub
>> >
>> > data class Daughter(
>> > val daughterField: String
>> > ) : Sub
>> >
>> > class EventDataTest {
>> > private val objectMapper = jacksonObjectMapper()
>> >
>> > @Test
>> > fun testDeserializeBase() {
>> > val json = """
>> > {
>> > "type": "sub",
>> > "sub_type": "son",
>> > "son_field": "son"
>> > }
>> > """.trimIndent()
>> > val base = objectMapper.readValue<Base>(json)
>> > }
>> > }
>> > ```
>> >
>> > But exception thrown:
>> >
>> > ```
>> > com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot
>> construct instance of `cn.chuanwise.onebot.lib.v11.data.event.Sub` (no
>> Creators, like default constructor, exist): abstract types either need to
>> be mapped to concrete types, have custom deserializer, or contain
>> additional type information
>> > at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION`
>> disabled); line: 2, column: 11]
>> > at
>> com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1887)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:414)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1375)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserialize(AbstractDeserializer.java:274)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:170)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:136)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:263)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:74)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:342)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4905)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3848)
>>
>>
>> > at
>> com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3831)
>>
>>
>> > at
>> cn.chuanwise.onebot.lib.v11.data.event.EventDataTest.testDeserializeBase(EventDataTest.kt:93)
>>
>>
>> > at
>> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
>> Method)
>> > at
>> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
>>
>>
>> > at
>> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>
>>
>> > at java.base/java.lang.reflect.Method.invoke(Method.java:568)
>> > at
>> org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:727)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
>>
>>
>> > at
>> org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:156)
>>
>>
>> > at
>> org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:147)
>>
>>
>> > at
>> org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:86)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(InterceptingExecutableInvoker.java:103)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.lambda$invoke$0(InterceptingExecutableInvoker.java:93)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:92)
>>
>>
>> > at
>> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:86)
>>
>>
>> > at
>> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:217)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
>>
>>
>> > at
>> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:213)
>>
>>
>> > at
>> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:138)
>>
>>
>> > at
>> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
>>
>>
>> > at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
>> > at
>> org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
>>
>>
>> > at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
>> > at
>> org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
>>
>>
>> > at
>> org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54)
>>
>>
>> > at
>> org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:107)
>>
>>
>> > at
>> org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
>>
>>
>> > at
>> org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
>>
>>
>> > at
>> org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
>>
>>
>> > at
>> org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
>>
>>
>> > at
>> org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114)
>>
>>
>> > at
>> org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
>>
>>
>> > at
>> org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
>>
>>
>> > at
>> org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:110)
>>
>>
>> > at
>> org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:90)
>>
>>
>> > at
>> org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:85)
>>
>>
>> > at
>> org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:62)
>>
>>
>> > at
>> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
>> Method)
>> > at
>> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
>>
>>
>> > at
>> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>
>>
>> > at java.base/java.lang.reflect.Method.invoke(Method.java:568)
>> > at
>> org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
>>
>>
>> > at
>> org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
>>
>>
>> > at
>> org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
>>
>>
>> > at
>> org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
>>
>>
>> > at jdk.proxy1/jdk.proxy1.$Proxy2.stop(Unknown Source)
>> > at
>> org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run(TestWorker.java:193)
>>
>>
>> > at
>> org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
>>
>>
>> > at
>> org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
>>
>>
>> > at
>> org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
>>
>>
>> > at
>> org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
>>
>>
>> > at
>> org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:113)
>>
>>
>> > at
>> org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:65)
>>
>>
>> > at
>> worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
>>
>>
>> > at
>> worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
>>
>>
>> > ```
>> >
>> > --
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>>
>>
>>
>
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