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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