参数json序列化报错： (no Creators, like default construct, exist): cannot deserialize from Object value (no

本是古典何须时尚 2024-02-05 21:34 27阅读 0赞

**参数json序列化报错，定位**

**问题**  
使用jackson对json字符串转对象时报错。 (no Creators, like default construct, exist): cannot deserialize from Object value

**分析**  
通过分析应该时construct构造函数出问题了。

**解决**  
**然后进入dto类中发现，代码中自定义了有参数的构造函数，导致默认无参构造函数失效，需要手动添加无参构造函数，用于对象的json序列化。**

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `CurrencyExchangeSpiRequestDTO` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
     at [Source: (String)"{
        
    	"originalAmount":"1000",
    	"targetCurrency":"SGD",
    	"datasource":"queryExchangeInfoProcess",
    	"originalCurrency":"JPY"
    }"; line: 2, column: 2]
    
    	at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
    	at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1589)
    	at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1055)
    	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1297)
    	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:326)
    	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
    	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4202)
    	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3205)
    	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3173)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:498)
    	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
    
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参数json序列化报错： (no Creators, like default construct, exist): cannot deserialize from Object value (no

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