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POJson - weired key exception?
 

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    <p>I have a <code>LinkedHashMap&lt;MyKey, MyValue&gt;</code>, MyKey and MyValue are the POJOs.</p> <p>MyKey is a bean which has getters and setters, it also has overridden hashcode() method. I read somewhere that Map will use hashcode() of object to form key, so if i write fromJson... how exactly is it reading it?</p> <p>In MyKey i have defined following function:</p> <pre><code>@JsonCreator public static MyKey fromJSON(String val) throws JsonParseException, JsonMappingException, IOException { ObjectMapper mapper = new ObjectMapper(); MyKey a = mapper.readValue(val,MyKey .class); return a; } </code></pre> <p>The Serialized Json String is going as {"MyKey@3":{MyValue.. json string}}.</p> <p>I am getting following exception trace:</p> <pre><code>at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163) at org.codehaus.jackson.map.deser.StdDeserializationContext.weirdKeyException(StdDeserializationContext.java:234) at org.codehaus.jackson.map.deser.StdKeyDeserializer.deserializeKey(StdKeyDeserializer.java:34) at org.codehaus.jackson.map.deser.MapDeserializer._readAndBind(MapDeserializer.java:223) at org.codehaus.jackson.map.deser.MapDeserializer.deserialize(MapDeserializer.java:165) at org.codehaus.jackson.map.deser.MapDeserializer.deserialize(MapDeserializer.java:25) at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:252) at org.codehaus.jackson.map.deser.SettableBeanProperty$MethodProperty.deserializeAndSet(SettableBeanProperty.java:356) at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:494) at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:368) at org.codehaus.jackson.map.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:77) at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeWithType(BeanDeserializer.java:423) at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:250) at org.codehaus.jackson.map.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:595) at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:472) at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:368) at org.codehaus.jackson.map.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:77) at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeWithType(BeanDeserializer.java:423) at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:250) at org.codehaus.jackson.map.deser.SettableBeanProperty$MethodProperty.deserializeAndSet(SettableBeanProperty.java:356) at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:494) at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:368) at org.codehaus.jackson.map.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:77) at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeWithType(BeanDeserializer.java:423) at org.codehaus.jackson.map.deser.StdDeserializerProvider$WrappedDeserializer.deserialize(StdDeserializerProvider.java:460) at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2395) at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1595) </code></pre> <p>How should i fix this? I would prefer not to register json serializer or deserializer if possible.</p>
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    1. COWhat exactly you want to do ? I mean not the thing you have done here... What is your expectation ?
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      1. USRuwantha
    2. CO@RJ45 MyKey class composes a value of BizKey (interface with many implementations). BizKey object ultimately decides the hashcode. MyKey can be considered as a wrapper for BizKey. So i want to use this wrapper as a key in a Map... did i uderstand your question correctly?
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