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Issues while deserializing exception/throwable using Jackson in Java

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無奈伤痛
無奈伤痛 2021-02-19 13:42

I am facing issues while deserializing Exception and Throwable instances using Jackson (version 2.2.1). Consider the following snippet:
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  • 北荒
    北荒 (楼主)
    2021-02-19 14:24

    I've had a similar issue. I'm using this code now, and it allows me to serialize and deserialize exceptions with proper types (i.e. a RuntimeException will be a RuntimeException again :)):

    public static ObjectMapper createObjectMapper() {
    ObjectMapper mapper = new ObjectMapper(null, null, new DefaultDeserializationContext.Impl(
            new BeanDeserializerFactory(new DeserializerFactoryConfig()) {
                private static final long serialVersionUID = 1L;

                @Override
                public JsonDeserializer buildThrowableDeserializer(
                        DeserializationContext ctxt, JavaType type, BeanDescription beanDesc)
                        throws JsonMappingException {
                    return super.buildBeanDeserializer(ctxt, type, beanDesc);
                }

            }));

    mapper.setVisibility(PropertyAccessor.ALL, Visibility.NONE);
    mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
    mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);

    mapper.addMixIn(Throwable.class, ThrowableMixin.class);
    mapper.addMixIn(StackTraceElement.class, StackTraceElementMixin.class);

    return mapper;
}

@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "@class")
@JsonAutoDetect(fieldVisibility = Visibility.ANY)
@JsonIgnoreProperties({ "message", "localizedMessage", "suppressed" })
abstract class ThrowableMixin {

    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "$id")
    private Throwable cause;
}

abstract class StackTraceElementMixin {

    @JsonProperty("className")
    private String declaringClass;

}



    I'm manipulating the BeanDeserializerFactory to make buildThrowableDeserializer not treat Throwable any special but just like any other Object. Then using Mixins to define the "special" handling of Throwable and StackTraceElement to my liking.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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